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51. Evaluation of a new high QE photomultiplier for air Cherenkov telescopes

Author: Daniel Ferenc, M. Merck, D. Kranich, J. Gebauer, R. Mirzoyan, and E. Lorenz
Subjects: Physics, Nuclear and High Energy Physics, Photomultiplier, Avalanche diode, business.industry, photomultipliers, high QE photocathode, air Cherenkov telescope, Photocathode, Particle detector, Cathode, Anode, law.invention, Optics, Townsend discharge, law, business, Instrumentation, Cherenkov radiation
Abstract: We report on the progress of a prototype hybrid photomultiplier (PMT), comprising a high QE, red extended GaAsP photocathode and an avalanche diode as electron bombarded anode with internal gain. These PMTs, with a larger cathode, are planned for the upgrade of the 17 m diameter MAGIC telescope for ground-based gamma (γ) astronomy.
Published: 2003

52. The Technical Performance of the HEGRA System of Imaging Air Cherenkov Telescopes

Author: W. Wittek, M. Panter, W. Stamm, Konrad Bernlöhr, Abelardo Moralejo, A. Plyasheshnikov, H. Kornmeyer, A. Konopelko, Jose Luis Contreras, H. Lampeitl, Gerd Pühlhofer, Juan Cortina, M. Samorski, Gavin Rowell, R. de los Reyes, C. A. Wiedner, S. Denninghoff, J. Ripken, G. Hermann, W. Rhode, O. Mang, M. Schilling, G. Heinzelmann, O. Bolz, H. Börst, M. Siems, A. Heusler, V. Vitale, D. Kranich, A. Kohnle, E. Lorenz, D. Sobzynska, I. Jung, H. Bojahr, R. Kankanyan, E. Ona-Wilhelmi, Werner Hofmann, Heinrich J. Völk, M. Beilicke, M.V. Fonseca, Dieter Horns, V. Sahakian, Felix Aharonian, M. Girma, H. Meyer, N. Götting, Marcos Lopez, A. G. Akhperjanian, R. Mirzoyan, M. Kestel, M. Tluczykont, F. Lucarelli, and T. Coarasa
Subjects: Physics, Photomultiplier, business.industry, Detector, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, HEGRA, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, law.invention, Telescope, Optics, law, Calibration, business, Sensitivity (electronics), Cherenkov radiation, Zenith
Abstract: Between early 1997 and late 2002, the HEGRA collaboration operated a stereoscopic system of 4 (later 5) imaging atmospheric Cherenkov telescopes. In this paper we present the calibration schemes which were developed for the system, and report on the performance of the detector over the years. In general, the telescope system was very well understood, regarding both the absolute calibration and the slight changes in performance over the years. The system had an energy threshold of 500 GeV for observations at zenith and under optimum detector conditions. With the corresponding calibration schemes, a systematic accuracy of 15 percent on the absolute energy scale has been achieved. The continuous sensitivity monitoring provided a relative accuracy of a few percent, and showed that the threshold did not exceed 600 GeV throughout the entire operation time. The readout electronics and the imaging quality of the dishes were well monitored and stable. The absolute pointing had an accuracy of at least 25 arcsec; this number was guaranteed throughout the whole lifetime of the experiment., Comment: 26 pages, 16 figures. Accepted for publication in Astroparticle Physics. This version uses espcrc2.sty
Published: 2003
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53. A search for TeV gamma-ray emission from SNRs, pulsars and unidentified GeV sources in the Galactic plane in the longitude range between -2 deg and 85 deg

Author: F. A. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr, H. Bojahr, O. Bolz, H. Börst, T. Coarasa, J. L. Contreras, J. Cortina, S. Denninghoff, V. Fonseca, M. Girma, N. Götting, G. Heinzelmann, G. Hermann, A. Heusler, W. Hofmann, D. Horns, I. Jung, R. Kankanyan, M. Kestel, J. Kettler, A. Kohnle, A. Konopelko, H. Kornmeyer, D. Kranich, H. Krawczynski, H. Lampeitl, M. Lopez, E. Lorenz, F. Lucarelli, O. Mang, H. Meyer, R. Mirzoyan, A. Moralejo, E. Ona, M. Panter, A. Plyasheshnikov, G. Pühlhofer, G. Rauterberg, R. Reyes, W. Rhode, J. Ripken, A. Röhring, G. P. Rowell, V. Sahakian, M. Samorski, M. Schilling, M. Siems, D. Sobzynska, W. Stamm, M. Tluczykont, H. J. Völk, C. A. Wiedner, and W. Wittek
Subjects: Physics, education.field_of_study, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Population, Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, HEGRA, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galactic plane, Supernova, Pulsar, Space and Planetary Science, education, Cherenkov radiation, Zenith, Astrophysics::Galaxy Astrophysics
Abstract: Using the HEGRA system of imaging atmospheric Cherenkov telescopes, one quarter of the Galactic plane (-2 deg < l < 85 deg) was surveyed for TeV gamma-ray emission from point sources and moderately extended sources (diameter, 10 pages, 5 figures, 4 tables, accepted for publication in A&A
Published: 2002

54. Reanalysis of the high energy cutoff of the 1997 Mkn 501 TeV energy spectrum

Author: M. Tluczykont, N. Götting, L. Padilla, M. Panter, G. Heinzelmann, A. Ibarra, Juan Abel Barrio, W. Wittek, Felix Aharonian, M. Kestel, M. Siems, H. J. Meyer, R. Plaga, D. Kranich, O. Mang, Dieter Horns, Henric Krawczynski, H. Bojahr, A. Heusler, A. Röhring, G. Hermann, M. Schilling, S. Denninghoff, Gerd Pühlhofer, Konrad Bernlöhr, M. Samorski, H. Kornmeyer, O. Bolz, R. Kankanyan, R. Mirzoyan, Werner Hofmann, Abelardo Moralejo, A. G. Akhperjanian, A. Kohnle, F. Lucarelli, N. Magnussen, J. Kettler, Heinrich J. Völk, I. Jung, H. Lampeitl, J. Prahl, Gavin Rowell, A. Plyasheshnikov, W. Stamm, A. Konopelko, Frank G. Schröder, Jose Luis Contreras, V. Fonseca, V. Sahakian, Juan Cortina, H. Börst, C. A. Wiedner, C. Iserlohe, Wolfgang Rhode, E. Lorenz, and J. C. Gonzalez
Subjects: Physics, Infrared, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Resolution (electron density), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, HEGRA, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Atmosphere, Space and Planetary Science, Intergalactic travel, Cutoff, Cherenkov radiation, Background radiation
Abstract: Data taken with the HEGRA system of imaging atmospheric Cherenkov telescopes during the 1997 flares of Mkn 501 are reanalyzed using an algorithm providing improved energy resolution. A resolution of 10% to 12% is obtained by accounting for the variation of the Cherenkov light yield with the height of the shower maximum in the atmosphere. The improved energy resolution is particularly relevant for the study of the high-energy cutoff in the spectrum, which might be caused by interactions with the intergalactic infrared background radiation. The reanalysis presented here confirms the results obtained in the previous analysis, but hints a steeper slope of the spectrum in the region around 20 TeV., 6 Pages, 4 figures; A&A, in press
Published: 2000

55. Rejection of the hypothesis that Markarian 501 TeV photons are pure Bose-Einstein condensates

Author: Dieter Horns, M. Schilling, A. Kohnle, N. Magnussen, M. Panter, O. Mang, Henric Krawczynski, H. Kornmeyer, M. Samorski, H. Meyer, S. Denninghoff, Felix Aharonian, C. Iserlohe, Wolfgang Rhode, I. Jung, A. Ibarra, A. Plyasheshnikov, Werner Hofmann, A. Konopelko, Jose Luis Contreras, Juan Cortina, M. Kestel, H. Börst, H. Bojahr, J. Prahl, R. Kankanyan, C. A. Wiedner, G. Hermann, A. Röhring, Juan Abel Barrio, D. Kranich, E. Lorenz, Gerd Pühlhofer, R. Plaga, G. Heinzelmann, O. Bolz, N. Götting, M. Tluczykont, L. Padilla, M. Siems, Abelardo Moralejo, A. Heusler, Konrad Bernlöhr, W. Wittek, R. Mirzoyan, A. G. Akhperjanian, V. Sahakian, J. Kettler, Heinrich J. Völk, H. Lampeitl, Gavin Rowell, W. Stamm, Frank G. Schröder, V. Fonseca, F. Lucarelli, and J. C. Gonzalez
Subjects: Physics, Photon, Infrared, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, HEGRA, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Air shower, Crab Nebula, Space and Planetary Science, Galaxy formation and evolution, High Energy Physics::Experiment, Stellar evolution, Astrophysics::Galaxy Astrophysics
Abstract: The energy spectrum of the Blazar type galaxy Markarian 501 (Mrk 501) as measured by the High-Energy-Gamma-Ray Astronomy (HEGRA) air Cerenkov telescopes extends beyond 16 TeV and constitutes the most energetic photons observed from an extragalactic object. A fraction of the emitted spectrum is possibly absorbed in interactions with low energy photons of the diffuse extragalactic infrared radiation, which in turn offers the unique possibility to measure the diffuse infrared radiation density by TeV spectroscopy. The upper limit on the density of the extragalactic infrared radiation derived from the TeV observations imposes constraints on models of galaxy formation and stellar evolution. One of the recently published ideas to overcome severe absorption of TeV photons is based upon the assumption that sources like Mrk 501 could produce Bose-Einstein condensates of coherent photons. The condensates would have a higher survival probability during the transport in the diffuse radiation field and could mimic TeV air shower events. The powerful stereoscopic technique of the HEGRA air Cerenkov telescopes allows to test this hypothesis by reconstructing the penetration depths of TeV air shower events: Air showers initiated by Bose-Einstein condensates are expected to reach the maximum of the shower development in the atmosphere earlier than single photon events. By comparing the energy-dependent penetration depths of TeV photons from Mrk 501 with those from the TeV standard-candle Crab Nebula and simulated air shower events, we can reject the hypothesis that TeV photons from Mrk 501 are pure Bose-Einstein condensates., 9 pages, 2 figures, published by ApJ Letters, revised version (simulation results added)
Published: 2000

56. The Energy Spectrum of TeV Gamma-Rays from the Crab Nebula as measured by the HEGRA system of imaging air Cherenkov telescopes

Author: H. Kornmeyer, G. Rauterberg, H. Lampeitl, Gerd Pühlhofer, M. Willmer, Juan Abel Barrio, M. Samorski, Henric Krawczynski, A. Röhring, G. Heinzelmann, Abelardo Moralejo, J. Kettler, Heinrich J. Völk, C. Köhler, F. Lucarelli, R. Mirzoyan, I. Calle, N. Götting, L. Padilla, A. G. Akhperjanian, W. Wittek, M. Panter, O. Mang, Axel Lindner, Dieter Horns, Werner Hofmann, M. Hemberger, R. Kankanyan, D. Kranich, H. Bojahr, G. Hermann, E. Lorenz, M. Kestel, B. Wiebel-Sooth, A. Kohnle, A. Plyasheshnikov, A. Konopelko, S. Denninghoff, Jose Luis Contreras, Juan Cortina, C. A. Wiedner, M. Schilling, J. Prahl, A. Ibarra, J. C. Gonzalez, H. Meyer, R. Plaga, N. Magnussen, A. Heusler, Konrad Bernlöhr, W. Stamm, M. Tluczykont, D. Schmele, Frank G. Schröder, V. Fonseca, V. Sahakian, and Felix Aharonian
Subjects: Physics, Nebula, Range (particle radiation), Photon, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, HEGRA, FOS: Physical sciences, Astronomy and Astrophysics, IACT, Astrophysics, Crab Nebula, Space and Planetary Science, Zenith
Abstract: The Crab Nebula has been observed by the HEGRA (High-Energy Gamma-Ray Astronomy) stereoscopic system of imaging air Cherenkov telescopes (IACTs) for a total of about 200 hrs during two observational campaigns: from September 1997 to March 1998 and from August 1998 to April 1999. The recent detailed studies of system performance give an energy threshold and an energy resolution for gamma-rays of 500 GeV and ~ 18%, respectively. The Crab energy spectrum was measured with the HEGRA IACT system in a very broad energy range up to 20 TeV, using observations at zenith angles up to 65 degrees. The Crab data can be fitted in the energy range from 1 to 20 TeV by a simple power-law, which yields dJg/dE = (2.79+/-0.02 +/- 0.5) 10^{-7} E^{-2.59 +/- 0.03 +/- 0.05}, ph m^{-2} s^{-1} TeV^{-1} The Crab Nebula energy spectrum, as measured with the HEGRA IACT system, agrees within 15% in the absolute scale and within 0.1 units in the power law index with the latest measurements by the Whipple, CANGAROO and CAT groups, consistent within the statistical and systematic errors quoted by the experiments. The pure power-law spectrum of TeV gamma-rays from the Crab Nebula constrains the physics parameters of the nebula environment as well as the models of photon emission., to appear in ApJ, 29 pages, 6 figures
Published: 2000

57. Comparison between HEGRA and RXTE ASM data from Mkn 501

Author: D. Kranich and J. C. González
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Astronomy, HEGRA, Gamma-ray astronomy, Astrophysics, law.invention, On board, Telescope, Sky, law, Satellite, Statistical analysis, Blazar, media_common
Abstract: In this paper we make a comparison of the data collected from the blazar Mkn 501 with the Cherenkov telescope CT1 of the HEGRA Collaboration and the All Sky Monitor (ASM), on board of the RXTE (X-ray Timing Explorer) satellite. We analyze data from the observation seasons 1996 till 1999. In these periods the source Mkn 501 has shown quite different behaviors: quiescent low-state and a high-state showing quasi-periodic oscillations and episodic bursts. The study of correlation between the gamma-ray and the X-ray regime is of crucial importance for the development of unified scenarios.
Published: 2000

58. Study of the temporal and spectral characteristics of TeV gamma radiation from Mkn 501 during a state of high activity by the HEGRA IACT array

Author: Timothy W. Schmidt, H. J. Meyer, H. Möller, R. Kankanian, Wolfgang Rhode, O. Kirstein, S. M. Bradbury, E. Feigl, J. G. Gonzalez, M. Panter, V. Haustein, L. Padilla, Henric Krawczynski, A. Frass, H. Kornmayer, Dieter Horns, Juan Abel Barrio, R. Mirzoyan, A. G. Akhperjanian, V. Fonseca, Axel Lindner, D. Schmele, I. Holl, Burkhardt Funk, G. Rauterberg, Juan Cortina, Konrad Bernlöhr, B. Wiebel-Sooth, G. Pühlhofer, M. Hemberger, G. Heinzelmann, M. Ulrich, V. Sahakian, J. Prahl, C. A. Wiedner, R. Plaga, R. Rivero, Werner Hofmann, C. Prosch, A. Daum, Dirk Petry, J. J. G. Beteta, W. Stamm, D. Kranich, José Fernández, A. Heusler, M. Samorski, H. Wirth, Felix Aharonian, G. Hermann, H. Lampeitl, M. Willmer, A. Röhring, N. Magnussen, Eckart Lorenz, C. Köhler, Janet Aguirre Sánchez, Heinrich J. Völk, A. Konopelko, J. L. Contreras, S. Westerhoff, M. Hess, T. Deckers, and Abelardo Moralejo
Subjects: Physics, Crab Nebula, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Flux, HEGRA, Astronomy, IACT, Astrophysics, Radiation, Gamma-ray burst, Cherenkov radiation
Abstract: During the period March-April 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging atmospheric Cherenkov telescopes (IACTs). The almost background-free detection of γ-rays with a rate exceeding in average 100 h−1, coupled with good energy resolution of the instrument ⩽25% allowed a study of the flux variation on time scales between 5 min and days, and measurements of the differential energy spectrum of the source for selected periods. Here we briefly discuss the results of observations with emphasis on the measurements of temporal and spectral characteristics of the source at 3 subsequent periods in April when the average flux of the source showed a remarkable increase of the flux from about one to eight times the flux observed from the Crab Nebula.
Published: 1997

59. A G-APD based Camera for Imaging Atmospheric Cherenkov Telescopes

Author: T. Krähenbühl, Thomas Bretz, O. Tibolla, Daniela Dorner, A. Boller, Karl Mannheim, Wolfgang Rhode, Felicitas Pauss, A. Gendotti, M. Ribordy, Oliver Grimm, Patrick Vogler, M. Rissi, D. Neise, U. Horisberger, Adrian Biland, E. Lorenz, V. Commichau, H. von Gunten, D. Hildebrand, H. Anderhub, Michael Backes, G. Viertel, L. S. Stark, Werner Lustermann, Ulf Roser, J.-P. Stucki, Quirin Weitzel, J.-H. Köhne, D. Kranich, S. Commichau, Ilana M. Braun, and Dieter Renker
Subjects: Physics, Nuclear and High Energy Physics, Photomultiplier, Gamma-ray astronomy, business.industry, Cherenkov detector, Extensive air shower, IACT, Avalanche photodiode, law.invention, Photodiode, Telescope, Optics, Cherenkov telescope, law, business, Geiger-mode avalanche photodiode, Instrumentation, Cherenkov radiation
Abstract: Imaging Atmospheric Cherenkov Telescopes (IACT) for Gamma-ray astronomy are presently using photomultiplier tubes as photo sensors. Geiger-mode avalanche photodiodes (G-APD) promise an improvement in sensitivity and, important for this application, ease of construction, operation and ruggedness. G-APDs have proven many of their features in the laboratory, but a qualified assessment of their performance in an IACT camera is best undertaken with a prototype. This paper describes the design and construction of a full-scale camera based on G-APDs realized within the FACT project (First G-APD Cherenkov Telescope). (C) 2010 Elsevier B.V. All rights reserved.

60. Cherenkov light based measurement of extensive air showers around the knee with the HEGRA experiment

Author: H. Lampeitl, T. Deckers, Wolfgang Rhode, R. Plaga, A. Plyasheshnikov, A. Heusler, Abelardo Moralejo, Dieter Horns, S. Denninghoff, Axel Lindner, H. Bojahr, D. Schmele, W. Stamm, A. Konopelko, Jose Luis Contreras, G. Hermann, C. Prosch, José Fernández, Konrad Bernlöhr, Juan Cortina, A. Daum, G. Pühlhofer, R. Kankanyan, C. Renault, Frank G. Schröder, V. Fonseca, G. Rauterberg, O. Kirstein, Felix Aharonian, Henric Krawczynski, L. Padilla, J. Prahl, H. Kornmayer, H. J. Meyer, E. Lorenz, M. Panter, M. Kestel, B. Wiebel-Sooth, Werner Hofmann, A. S. Belgarian, J.C. Gonzales, M. Hess, H. Hohl, V. Sahakian, M. Samorski, A. Röhring, G. Heinzelmann, N. Magnussen, R. Mirzoyan, A. G. Akhperjanian, Juan Abel Barrio, Heinrich J. Völk, C. Köhler, Dirk Petry, M. Hemberger, and D. Kranich
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, HEGRA, Cosmic ray, Scintillator, Atomic and Molecular Physics, and Optics, Particle detector, law.invention, Nuclear physics, Air shower, law, High Energy Physics::Experiment, Cherenkov radiation
Abstract: Data of the wide angle atmospheric Cherenkov light detector array AIROBICC and the scintillator matrix of the HEGRA air shower detector complex are combined to determine the energy spectrum and coarse composition of charged cosmic rays in the energy interval from 300 TeV to 10 PeV.

61. Long-Term Monitoring Of Bright Blazars With A Dedicated Cherenkov Telescope

Author: T. Krähenbühl, F. Clevermann, Dieter Renker, Oliver Grimm, D. Kranich, M. Rissi, D. Neise, V. Commichau, Julia Becker, S. Commichau, H. von Gunten, M. Pohl, Karl Mannheim, Felicitas Pauss, Thomas Bretz, Ilana M. Braun, Michael Backes, Adrian Biland, Wolfgang Rhode, S. Rollke, L. S. Stark, Ulf Roser, E. Lorenz, Daniela Dorner, U. Straumann, D. Hildebrand, M. Ribordy, Werner Lustermann, G. Viertel, B. Huber, Quirin Weitzel, and I. Britvich
Subjects: Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, remote operation, law.invention, Telescope, Astrophysical jet, law, Proton Blazar, gamma-ray astronomy, Objects, Mkn 501, Binary, Agn, Blazar, Mathematical Physics, Cherenkov radiation, Astrophysics::Galaxy Astrophysics, Physics, instrumentation, Astrophysics::Instrumentation and Methods for Astrophysics, HEGRA, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Cherenkov Telescope Array, monitoring, Space and Planetary Science
Abstract: Flaring activity of Active Galactic Nuclei (AGN) in VHE γ-ray astronomy is observed on timescales from minutes to years and can be explained either by the interaction of relativistic jets with the surrounding material or by imprints of the central engine, like temporal modulation caused by binary systems of supermassive black holes. The key to answer those questions lies in combining 24/7 monitoring with short high sensitivity exposures as provided by the third generation γ-ray astronomy instruments like MAGIC, VERITAS and H.E.S.S. The long-term observations can be provided by a global network of small robotic Cherenkov telescopes.1 As a first step, we are currently setting up a dedicated Cherenkov telescope, which will carry out joint observations with the Whipple 10 m telescope for AGN monitoring. The new telescope will be designed for low costs but high performance by upgrading one of the former HEGRA telescopes, still located at the MAGIC site on the Canary Island of La Palma (Spain). The main novelties will be its robotic operation and a novel camera type, resulting in a greatly improved sensitivity and a lower energy threshold.

62. TeV γ-ray observations of the Crab and Mkn 501 during moonshine and twilight

Author: D. Kranich, R. Mirzoyan, D. Petry, B.C. Raubenheimer, F. Aharonian, A.G. Akhperjanian, J.A. Barrio, C. Beck, K. Bernlöhr, H. Bojahr, J.L. Contreras, J. Cortina, A. Daum, T. Deckers, S. Denninghoff, V. Fonseca, J. Gebauer, J.C. Gonzalez, G. Heinzelmann, M. Hemberger, G. Hermann, M. Hess, A. Heusler, W. Hofmann, H. Hohl, D. Horns, A. Ibarra, R. Kankanyan, M. Kestel, O. Kirstein, C. Köhler, A. Konopelko, H. Kornmayer, H. Krawczynski, H. Lampeitl, A. Lindner, E. Lorenz, N. Magnussen, H. Meyer, A. Moralejo, L. Padilla, M. Panter, R. Plaga, A. Plyasheshnikov, J. Prahl, G. Pühlhofer, G. Rauterberg, C. Renault, W. Rhode, A. Roehring, V. Sahakian, M. Samorski, D. Schmele, F. Schröder, W. Stamm, H. Völk, B. Wiebel-Sooth, C. Wiedner, M. Willmer, H. Wirth, and W. Wittek
Subjects: Physics, Twilight, Trigger rate, Astrophysics (astro-ph), Gamma ray, FOS: Physical sciences, HEGRA, Astronomy and Astrophysics, Astrophysics, law.invention, Telescope, Crab Nebula, law, New moon, Flare
Abstract: TeV Gamma-ray signals from the Crab Nebula and Mkn 501 were detected with the HEGRA CT1 imaging Cerenkov telescope during periods when the moon was shining and during twilight. This was accomplished by lowering the high voltage supply of the photomutipliers in fixed steps up to 13%. No other adjustments were made and no filters were used. Laser runs could not establish any non-linearity in the gain of the individual pixels, and the trigger rate was uniform over the whole camera. The energy threshol was increased by up to a factor of two, depending on the amount of HV reduction. In a series of observations lasting 11.7 hours, a signal with a 3.4 sigma significance was detected from the Crab. During the 1997 multiple flare episode of Mkn 501 a 26 sigma combined excess has been recorded during 134 hours of observations under various moonshine/twilight conditions. The results show that this technique can easily be adapted to increase the exposure of a source, which is important for sources showing rapid time variability such as AGNs or GRBs. Observations can be made up to ~20 deg. angular separation from the moon and until the moon is 85% illuminated (ten to eleven days before and after new moon), as well as during 20 to 40 minutes during twilight, before the commencement of astronomical darkness., 16 pages, 5 figures, submitted to Astroparticle Physics

63. FADC signal reconstruction for the MAGIC telescope

Author: H. Anderhub, K. Shinozaki, Stefano Ciprini, M. Camara, R. Mirzoyan, E. Carmona, Roberta Zanin, Florian Goebel, M. V. Fonseca, P. Jacon, Jorge Andres Lopez Lopez, D. Hakobyan, F. Zandanel, E. Domingo-Santamaría, J. Hose, Jelena Ninkovic, Michela Fagiolini, Oriana Mansutti, Francesco Dazzi, M. Rissi, S. Mizobuchi, Tadeusz Wibig, V. Scalzotto, M. A. Lopez, T. Schweizer, Francesco Longo, W. Wittek, Marc Ribó, J. Zapatero, D. Tescaro, Pol Bordas, Dorota Sobczyńska, M. T. Costado, V. Vitale, C. C. Hsu, Miriam Lucio Martinez, Justin Albert, M. Asensio, Steven N. Shore, V. Curtef, R. Schmitt, Riccardo Paoletti, Takashi Saito, Masahiro Teshima, Igor Oya, Jose Flix, G. Maneva, Daniel Nieto, Daniel Kranich, C. Merck, E. Aliu, E. Prandini, P. Antoranz, Elina Lindfors, Ll. Font, R. K. Bock, C. Baixeras, A. Sillanpää, A. Herrero, A. Saggion, L. O. Takalo, Adrian Biland, S. Rügamer, C. Delgado, V. Danielyan, Masaaki Hayashida, Antonio Stamerra, Juan Abel Barrio, Diego F. Torres, Ciro Bigongiari, M. Pasanen, R. G. Pegna, Markus Gaug, K. Berger, A. Armada, J. Rico, Jose Luis Contreras, Mosè Mariotti, M. Garczarczyk, Josep M. Paredes, M. Shayduk, T. Jogler, Ashot Chilingarian, Juan Cortina, E. Oña-Wilhelmi, R. Kritzer, A. Raymers, A. De Angelis, R. Firpo, B. De Lotto, D. Höhne, L. S. Stark, R. J. García-López, N. Puchades, A. Piccioli, Nicola Galante, R. Kosyra, Robert Wagner, Saverio Lombardi, H. Bartko, E. Fernandez, E. Lorenz, I. Britvitch, Daniel Ferenc, Maria Giller, Thomas Bretz, H. Vankov, Abelardo Moralejo, Michele Doro, N. Otte, M. Panniello, P. Sartori, D. Mazin, Manel Errando, Kari Nilsson, Wolfgang Rhode, Julia Becker, S. Commichau, Wlodek Bednarek, Jose Miguel Miranda, Daniela Dorner, A. Laille, Petar Temnikov, M. Fuchs, Massimo Persic, Mario Meucci, J. A. Coarasa, Valentí Bosch-Ramon, L. Peruzzo, V. Scapin, R. de los Reyes, Nicola Turini, P. Majumdar, N. Sidro, M. Meyer, D. Pascoli, A. Robert, Felicitas Pauss, T. Hengstebeck, Denis Bastieri, Alvaro Sanchez, Karl Mannheim, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, C., Delgado, R. d., los Reye, B. D., Lotto, E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, R. J., Garcia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, N., Puchade, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T., Saito, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: signal sampling, Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, Very High Energy Gamma Ray Astronomy, Detectors, MAGIC telescope, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Signal, law.invention, Telescope, Optics, IMAGING CHERENKOV DETECTOR, law, Calibration, MAGIC (telescope), Instrumentation, Cherenkov radiation, CALIBRATION, Physics, Signal reconstruction, business.industry, GAMMA-RAY ASTRONOMY, SYSTEM, TESTS, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Detector, business
Abstract: Until April 2007 the MAGIC telescope used a 300 MSamples/s FADC system to sample the shaped PMT signals produced by the captured Cherenkov photons of air showers. Different algorithms to reconstruct the signal from the read-out samples (extractors) have been implemented and are described and compared. Criteria based on the obtained charge and time resolution/bias are defined and used to judge the different extractors, by applying them to calibration, cosmic and pedestal signals. The achievable charge and time resolution have been derived as functions of the incident number of photo-electrons., Accepted for publication in NIM A
Published: 2008

64. Observations of Markarian 421 with the MAGIC Telescope

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bock, R. K., Bordas, P., Bosch-Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., De Los Reyes, R., De Lotto, B., Domingo-Santamaría, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Hsu, C. C., Jacon, P., Jogler, T., Kalekin, O., Kosyra, R., Kranich, D., Kritzer, R., Laatiaoui, M., Laille, A., Liebing, P., Lindfors, E., Lombardi, S., Longo, F., López, J., López, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martínez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., Oña-Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Prandini, E., Raymers, A., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, O., Kalekin, R., Kosyra, D., Kranich, R., Kritzer, M., Laatiaoui, A., Laille, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero
Subjects: Astrophysics::High Energy Astrophysical Phenomena, EXTRAGALACTIC BACKGROUND LIGHT, ACTIVE GALAXY MARKARIAN-421, TEV BLAZAR MARKARIAN-421, SPITZER-SPACE-TELESCOPE, DIFFUSE INFRARED LIGHT, HIGH-ENERGY PHOTONS, COBE DIRBE MAPS, BL-LAC OBJECTS, 1ST DETECTIONS, GAMMA-RAYS, Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Power law, individual (Markarian 421) [BL Lacertae objects], law.invention, law, Blazar, Physics, Attenuation, BL Lacertae Objects: Individual: Name: Markarian 421 [Galaxies], observations [gamma rays], Quiescent state, Astronomy and Astrophysics, Synchrotron, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421, Extragalactic background light, Space and Planetary Science, Data analysis, Spectral energy distribution, Electrónica, Física nuclear, Gamma Rays: Observations, Electricidad
Abstract: The MAGIC telescope took data of very high energy ?-ray emission from the blazar Markarian 421 (Mrk 421) between 2004 November and 2005 April. We present a combined analysis of data samples recorded under different observational conditions, down to ?-ray energies of 100 GeV. The flux was found to vary between 0.5 and 2 crab (integrated above 200 GeV), considered a low state when compared to known data. Although the flux varied day by day, no short-term variability was observed, although there is some indication that not all nights show an equally quiescent state. The results at higher energies were found to be consistent with previous observations. A clear correlation is observed between ?-ray and X-ray fluxes, whereas no significant correlation between ?-ray and optical data is seen. The spectral energy distribution between 100 GeV and 3 TeV shows a clear deviation from a power law, more clearly and at lower flux than previous observations at higher energies. The deviation persists after correcting for the effect of attenuation by the extragalactic background light, and most likely is source-inherent. There is a rather clear indication of an inverse Compton peak around 100 GeV. The spectral energy distribution of Mrk 421 can be fitted by a one-zone synchrotron self-Compton model, suggesting once again a leptonic origin of the very high energy ?-ray emission from this blazar. ispartof: Astrophysical Journal vol:663 issue:1 pages:125-138 status: published
Published: 2007

65. Correlated X-ray and Very High Energy emission in the gamma-ray binary LS I +61 303

Author: The MAGIC Collaboration, González, J. Becerra, Pasanen, M., Pascoli, D., Pauss, F., Pegna, R. G., Perez-Torres, M. A., Persic, M., Peruzzo, L., Prada, F., Prandini, E., Puchades, N., Becker, J. K., Puljak, I., Reichardt, I., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Saito, T. Y., Bednarek, W., Salvati, M., Sánchez-Conde, M., Satalecka, K., Scalzotto, V., Scapin, V., Schweizer, T., Shayduk, M., Shore, S. N., Sidro, N., Sierpowska-Bartosik, A., Berger, K., Sillanpää, A., Sitarek, J., Sobczynska, D., Spanier, F., Spiro, S., Stamerra, A., Stark, L. S., Suric, T., Takalo, L., Tavecchio, F., Bernardini, E., Temnikov, P., Tescaro, D., Teshima, M., Torres, D. F., Turini, N., Vankov, H., Wagner, R. M., Zabalza, V., Zandanel, F., Zanin, R., Biland, A., Zapatero, J., Falcone, A., Vetere, L., Gehrels, N., Trushkin, S., Dhawan, V., Reig, P., Bigas, O. Blanch, Bock, R. K., Bonnoli, G., Bordas, P., Anderhub, H., Tridon, D. Borla, Bosch-Ramon, V., Bose, D., Braun, I., Bretz, T., Britzger, D., Camara, M., Carmona, E., Carosi, A., Colin, P., Antonelli, L. A., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Covino, S., Dazzi, F., De Angelis, A., del Pozo, E. de Cea, Reyes, R. De los, De Lotto, B., Antoranz, P., De Maria, M., De Sabata, F., Mendez, C. Delgado, Domínguez, A., Prester, D. Dominis, Dorner, D., Doro, M., Elsaesser, D., Errando, M., Ferenc, D., Backes, M., Fernández, E., Firpo, R., Fonseca, M. V., Font, L., Galante, N., López, R. J. García, Garczarczyk, M., Gaug, M., Godinovic, N., Goebel, F., Baixeras, C., Hadasch, D., Herrero, A., Hildebrand, D., Höhne-Mönch, D., Hose, J., Hrupec, D., Hsu, C. C., Jogler, T., Klepser, S., Kranich, D., Balestra, S., La Barbera, A., Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, F., López, M., Lorenz, E., Majumdar, P., Maneva, G., Barrio, J. A., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., Miranda, J. M., Mirzoyan, R., Miyamoto, H., Bastieri, D., Moldón, J., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Orito, R., Oya, I., Paoletti, R., Paredes, J. M., H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, O. B., Biga, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D. C., del Pozo, R. D., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, F., Goebel, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, L. S., Stark, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, A., Falcone, L., Vetere, N., Gehrel, S., Trushkin, V., Dhawan, and P., Reig
Subjects: Very High Energy Gamma-ray Astronomy, MAGIC telescope, Gamma-ray Binaries, Photon, binaries: general, gamma rays: observations, stars: emission-line Be, stars: individ- ual (LS I +61 303), X-rays: binaries, X-rays: individual (LS I +61 303), Astrophysics::High Energy Astrophysical Phenomena, Population, FOS: Physical sciences, stars: emission-line, Synchrotron radiation, Astrophysics::Cosmology and Extragalactic Astrophysics, Electron, Astrophysics, 01 natural sciences, Raigs gamma, X-rays, 0103 physical sciences, education, Absorption (electromagnetic radiation), 010303 astronomy & astrophysics, Estels binaris de raigs X, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, education.field_of_study, 010308 nuclear & particles physics, Gamma rays, Compton scattering, Gamma ray, Astronomy and Astrophysics, Particle acceleration, X-ray binaries, stars: individual: LS I +61 303, X-Rays: Binaries, 13. Climate action, Space and Planetary Science, ddc:520, Electrónica, Física nuclear, Raigs X, Gamma Rays: Observations, Electricidad, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60% of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r=0.97, while a linear fit to all simultaneous pairs provides r=0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons., To appear in The Astrophysical Journal Letters. 6 pages, 2 figures
Published: 2015

66. Discovery of Very High Energy γ-Rays from Markarian 180 Triggered by an Optical Outburst

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, Denis, Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bordas, P., BOSCH RAMON, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, Francesco, DE ANGELIS, A., DE LOS REYES, R., DE LOTTO, B., DOMINGO SANTAMARIA, E., Dorner, D., Doro, Michele, Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Hohne, D., Hose, J., Hsu, C. C., Isar, P. G., Jacon, P., Kalekin, O., Kosyra, R., Kranich, D., Laatiaoui, M., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Lombardi, Saverio, Longo, F., Lopez, J., Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, Mose', Martinez, M., Mase, K., Daniel, Mazin, Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., ONA WILHELMI, E., Orduna, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, Donatella, Pauss, F., Pavel, N., Pegna, R., Persic, M., Peruzzo, Luigi, Piccioli, A., Poller, M., Prandini, Elisa, Raymers, A., Rhode, W., Ribo, M., Rico, J., Riegel, B., Rissi, M., Robert, A., Rugamer, S., Saggion, Antonio, Sanchez, A., Sartori, Paolo, Scalzotto, VILLI MARIO, Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpaa, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P., Jacon, O., Kalekin, R., Kosyra, D., Kranich, M., Laatiaoui, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero
Subjects: BL Lacertae objects : individual (Markarian 180), High energy, Photon, Astrophysics::High Energy Astrophysical Phenomena, individual (Markarian 180) [BL Lacertae objects], Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Raigs gamma, Observacions astronòmiques, Target of opportunity, gamma rays : observations, BL Lacertae Objects: Individual: Name: Markarian 180 [Galaxies], Cosmic rays, Astrophysics::Galaxy Astrophysics, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 180, Gamma Rays: Observations, Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Observations [Gamma Rays], Gamma rays, Gamma ray, Astronomy and Astrophysics, Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Astrophysics::Earth and Planetary Astrophysics, Electricidad, Astronomical observations, BL Lac object
Abstract: The high-frequency-peaked BL Lacertae object Markarian~180 (Mrk~180) was observed to have an optical outburst in 2006 March, triggering a Target of Opportunity observation with the MAGIC telescope. The source was observed for 12.4 hr and very high energy $\gamma$-ray emission was detected with a significance of 5.5 $\sigma$. An integral flux above 200 GeV of $(2.3\pm0.7)\times10^{-11} {cm}^{-2} {s}^{-1}$ was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of $-3.3\pm0.7$ has been determined. No significant flux variation was found., Comment: Accepted by ApJ Letters, minor revisions
Published: 2006

67. MAGIC observations of PG 1553+113 during a multiwavelength campaign in July 2006

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J. K., Bednarek, W., Berdyugin, A., Berger, K., Bigongiari, C., Biland, A., Bock, R. K., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Curtef, V., Danielyan, V., Dazzi, F., Angelis, A. D., Delgado, C., Reyes, R. D., Lotto, B. D., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garcia Lopez, R. J., Garczarczyk, M., Gaug, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Herrero, A., Hohne, D., Hose, J., Hsu, C. C., Huber, S., Jacon, P., Jogler, T., Kosyra, R., Kranich, D., Kritzer, R., Laille, A., Lindfors, E., Lombardi, S., Longo, Francesco, Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mariotti, M., Martinez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Ona Wilhelmi, E., Otte, N., Oya, I., Panniello, M., Paoletti, R., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Prandini, E., Puchades, N., Raymers, A., Rico, J., Rhode, W., Rissi, M., Robert, A., Rugamer, S., Saggion, A., Saito, T. Y., Sanchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpaa, A., Sobczynska, D., Spanier, F., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Torres, D. F., Turini, N., Vankov, H., Venturini, A., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zandanel, F., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, A., Berdyugin, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, C., Delgado, R. D., Reye, B. D., Lotto, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, M., Fuch, N., Galante, R. J., Garcia Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, S., Huber, P., Jacon, T., Jogler, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, M., Panniello, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, E., Prandini, N., Puchade, A., Raymer, J., Rico, W., Rhode, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Active galactic nucleus, TELESCOPE, FOS: Physical sciences, Flux, Astrophysics, REDSHIFTS, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Power law, Energy spectrum, MAGIC (telescope), PG-1553+113, Physics, Spectral index, SPECTROSCOPY, Astrophysics (astro-ph), Active Galactic Nuclei, Astronomy and Astrophysics, BL LACERTAE OBJECTS, MAGIC telescope, Very High Energy Gamma-ray Astronomy, Space and Planetary Science, Electrónica, Física nuclear, Atmospheric absorption, Electricidad
Abstract: The active galactic nucleus PG 1553+113 was observed by the MAGIC telescope in July 2006 during a multiwavelength campaign, in which telescopes in the optical, X-ray, and very high energies participated. Although the MAGIC data were affected by strong atmospheric absorption (calima), they were analyzed after applying a correction. In 8.5 hours, a signal was detected with a significance of 5.0 sigma. The integral flux above 150 GeV was (2.6 +/- 0.9)*10^{-7} ph/s/m^2. By fitting the differential energy spectrum with a power law, a spectral index of -4.1 +/- 0.3 was obtained., 4 pages, 3 figures, accepted for publication in A&A
Published: 2008

68. GAMMA-RAY EXCESS FROM A STACKED SAMPLE OF HIGH- AND INTERMEDIATE-FREQUENCY PEAKED BLAZARS OBSERVED WITH THE MAGIC TELESCOPE

Author: Daniel Ferenc, M. Camara, Jose Luis Contreras, H. Vankov, Ilana M. Braun, Daniel Nieto, D. Bose, Dominik Elsaesser, Juan Cortina, Diego F. Torres, M. Pasanen, Pratik Majumdar, A. Sillanpää, M. V. Fonseca, Dorota Sobczyńska, J. M. Paredes, Antonio Stamerra, M. Rissi, Daniela Dorner, Abelardo Moralejo, Javier Moldon, Stefano Covino, J. C. Struebig, S. Spiro, E. Lorenz, Ivica Puljak, Pierre Colin, Dario Hrupec, Thomas Bretz, S. N. Shore, Roberta Zanin, B. Steinke, M. López, J. Rico, D. Dominis Prester, A. De Angelis, R. K. Bock, Petar Temnikov, D. Tescaro, A. La Barbera, Elisa Bernardini, B. De Lotto, S. Klepser, D. Hildebrand, L. Peruzzo, Mariano Moles, E. Prandini, Kari Nilsson, Marc Ribó, Valentí Bosch-Ramon, Francisco Prada, L. A. Antonelli, S. Rügamer, Juan Abel Barrio, M. T. Costado, Ignasi Reichardt, M. I. Martínez, A. Herrero, V. Scapin, D. Borla Tridon, A. Laille, O. Tibolla, R. J. García López, Denis Bastieri, Q. Weitzel, Riccardo Paoletti, Tihomir Surić, Giacomo Bonnoli, Igor Oya, Fabrizio Tavecchio, F. De Sabata, Daniel Kranich, L. Maraschi, Ll. Font, V. Scalzotto, Elina Lindfors, Andrei Berdyugin, T. Jogler, Pol Bordas, K. Berger, G. Maneva, Daniel Mazin, D. Pascoli, Agnieszka Sierpowska-Bartosik, A. Saggion, S. Paiano, R. G. Pegna, Karl Mannheim, Masahiro Teshima, Adrian Biland, Markus Gaug, C. Delgado Mendez, L. O. Takalo, R. de los Reyes, R. Mirzoyan, C. Schultz, Manel Errando, J. Becerra González, Felix Spanier, Wolfgang Rhode, Jelena Ninkovic, Miguel A. Pérez-Torres, E. Carmona, Markus Garczarczyk, Mosè Mariotti, Mario Meucci, Francesco Dazzi, Fabio Zandanel, Takashi Saito, Massimo Persic, C. C. Hsu, E. Leonardo, D. Britzger, Nikola Godinovic, Tomislav Terzić, Reiko Orito, M. Sánchez-Conde, M. De Maria, Aaron Dominguez, Felicitas Pauss, Saverio Lombardi, Victor Zabalza, T. Schweizer, N. Puchades, T. Krähenbühl, M. Salvati, M. Shayduk, E. De Cea del Pozo, P. Antoranz, Nijil Mankuzhiyil, S. Partini, Francesco Longo, D. Höhne-Mönch, Oscar Blanch, Robert Wagner, M. Doert, Michael Backes, Konstancja Satalecka, Michele Doro, Hiroko Miyamoto, Jelena Aleksić, C. Baixeras, Julian Sitarek, J. Hose, Daniela Hadasch, S. Commichau, Wlodek Bednarek, Alessandro Carosi, Jose Miguel Miranda, J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, D., Bastieri, Gonzalez, J., W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, O., Blanch, R. K., Bock, G., Bonnoli, P., Borda, Tridon, D., V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, Angelis, A., Cea, E., Los, R., Lotto, B., Maria, M., Sabata, F., Mendez, C., M., Doert, A., Dom\inguez, Prester, D., D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J., Garc\ia, M., Garczarczyk, M., Gaug, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., H\ohne M\onch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Kr\ahenb\uhl, D., Kranich, Barbera, A., A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Mart\inez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, S., Paiano, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., R\ugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanp\a\a, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, O., Tibolla, D. F., Torre, H., Vankov, R. M., Wagner, Q., Weitzel, V., Zabalza, F., Zandanel, and R., Zanin
Subjects: CHERENKOV TELESCOPE, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Standard deviation, BL-LAC OBJECTS, HESS, gamma rays: galaxies, 0103 physical sciences, BL lacertae objects, Blazar, 010303 astronomy & astrophysics, astro-ph.HE, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Range (particle radiation), BL Lacertae objects: general, 010308 nuclear & particles physics, general [BL Lacertae objects], Gamma ray, CONSTRAINTS, Astronomy and Astrophysics, Redshift, CRAB-NEBULA, MODEL, Crab Nebula, gamma rays: observations, Intermediate frequency, Space and Planetary Science, JET, DISCOVERY, galaxies [gamma rays], RADIATION, Electrónica, Física nuclear, EMISSION, Electricidad, Astrophysics - High Energy Astrophysical Phenomena
Abstract: 14 páginas, 6 figuras, 4 tablas.-- El Pdf del artículo es la versión pre-print: arXiv:1002.2951v3.-- MAGIC Collaboration: et al., Between 2004 and 2009, a sample of 28 X-ray selected high- and intermediate-frequency peaked blazars with an X-ray flux larger than 2 μJy at 1 keV in the redshift range from 0.018 to 0.361 was observed with the MAGIC telescope at energies above 100 GeV. Seven among them were detected and the results of these observations are discussed elsewhere. Here we concentrate on the remaining 21 blazars which were not detected during this observation campaign and present the 3σ (99.7%) confidence upper limits on their flux. The individual flux upper limits lie between 1.6% and 13.6% of the integral flux from the Crab Nebula. Applying a stacking method to the sample of non-detections with a total of 394.1 hr exposure time, we find evidence for an excess with a cumulative significance of 4.9 standard deviations. It is not dominated by individual objects or flares, but increases linearly with the observation time as for a constant source with an integral flux level of ~1.5% of that observed from the Crab Nebula above 150 GeV., The support of the German BMBF and MPG, the Italian INFN, the Swiss National Fund SNF, and the Spanish MICINN is gratefully acknowledged. This work was also supported by the Polish MNiSzW Grant N N203 390834, by the YIP of the Helmholtz Gemeinschaft, and by grant DO02-353 of the the Bulgarian National Science Fund.
Published: 2011

69. Magic Constraints on γ-ray Emission from Cygnus X-3

Author: Aleksic, J, Antonelli, La, Antoranz, P, Backes, M, Baixeras, C, Barrio, Ja, Bastieri, Denis, Gonzalez, Jb, Bednarek, W, Berdyugin, A, Berger, K, Bernardini, E, Biland, A, Blanch, O, Bock, Rk, Boller, A, Bonnoli, G, Bordas, P, Tridon, Db, BOSCH RAMON, V, Bose, D, Braun, I, Bretz, T, Britzger, D, Camara, M, Carmona, E, Carosi, A, Colin, P, Contreras, Jl, Cortina, J, Costado, Mt, Covino, S, Dazzi, F, DE ANGELIS, A, DEL POZO EDC, DE LOTTO, B, DE MARIA, M, DE SABATA, F, Mendez, Cd, Doert, M, Dominguez, A, Prester, Dd, Dorner, D, Doro, Michele, Elsaesser, D, Errando, M, Ferenc, D, Fonseca, Mv, Font, L, Lopez, Rjg, Garczarczyk, M, Gaug, M, Godinovic, N, Goebel, F, Hadasch, D, Herrero, A, Hildebrand, D, HOHNE MONCH, D, Hose, J, Hrupec, D, Hsu, Cc, Jogler, T, Klepser, S, Krahenbuhl, T, Kranich, D, LA BARBERA, A, Laille, A, Leonardo, E, Lindfors, E, Lombardi, S, Longo, F, Lopez, M, Lorenz, E, Majumdar, P, Maneva, G, Mankuzhiyil, N, Mannheim, K, Maraschi, L, Mariotti, Mose', Martinez, M, Mazin, D, Meucci, M, Miranda, Jm, Mirzoyan, R, Miyamoto, H, Moldon, J, Moles, M, Moralejo, A, Nieto, D, Nilsson, K, Ninkovic, J, Orito, R, Oya, I, Paiano, S, Paoletti, R, Paredes, Jm, Partini, S, Pasanen, M, Pascoli, Donatella, Pauss, F, Pegna, Rg, PEREZ TORRES MA, Persic, M, Peruzzo, L, Prada, F, Prandini, Elisa, Puchades, N, Puljak, I, Reichardt, I, Rhode, W, Ribo, M, Rico, J, Rissi, M, Rugamer, S, Saggion, Antonio, Saito, K, Saito, Ty, Salvati, M, SANCHEZ CONDE, M, Satalecka, K, Scalzotto, VILLI MARIO, Scapin, V, Schultz, C, Schweizer, T, Shayduk, M, Shore, Sn, SIERPOWSKA BARTOSIK, A, Sillanpaa, A, Sitarek, J, Sobczynska, D, Spanier, F, Spiro, S, Stamerra, A, Steinke, B, Struebig, Jc, Suric, T, Takalo, L, Tavecchio, F, Temnikov, P, Terzic, T, Tescaro, D, Teshima, M, Torres, Df, Vankov, H, Wagner, Rm, Weitzel, Q, Zabalza, V, Zandanel, F, Zanin, R, Bulgarelli, A, MAX MOERBECK, W, Piano, G, Pooley, G, Readhead, Acs, Richards, Jl, Sabatini, S, Striani, E, Tavani, M, Trushkin, S., J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, D., Bastieri, J. B., Gonzalez, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, O., Blanch, R. K., Bock, A., Boller, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D. C., Del Pozo, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, M., Doert, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, F., Goebel, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, S., Paiano, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., Rugamer, A., Saggion, K., Saito, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, D. F., Torre, H., Vankov, R. M., Wagner, Q., Weitzel, V., Zabalza, F., Zandanel, R., Zanin, A., Bulgarelli, W., Max Moerbeck, G., Piano, G., Pooley, A. C. S., Readhead, J. L., Richard, S., Sabatini, E., Striani, M., Tavani, and S., Trushkin
Subjects: Photon, HIGH-ENERGY EMISSION, MICROQUASAR GRS 1915+105, X-RAY, RELATIVISTIC JET, CYG X-3, RADIO OUTBURST, CRAB-NEBULA, BINARY, TELESCOPE, PULSAR, Astrophysics, 01 natural sciences, law.invention, Raigs gamma, law, Observacions astronòmiques, 010303 astronomy & astrophysics, Estels binaris de raigs X, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Very High Energy Gamma-ray Astronomy, MAGIC telescope, Black Holes, Gamma ray, X-ray binaries, Electrónica, Física nuclear, Radio frequency, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Astronomical observations, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Compact star, Radiation, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Telescope, 0103 physical sciences, acceleration of particles, binaries: general, gamma rays: observations, X-rays: bina- ries — X-rays: individual (Cygnus X-3), Cherenkov radiation, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Gamma rays, Magic (programming), Astronomy, Astronomy and Astrophysics, Space and Planetary Science
Abstract: Cygnus X-3 is a microquasar consisting of an accreting compact object orbiting around a Wolf-Rayet star. It has been detected at radio frequencies and up to high-energy gamma rays (above 100 MeV). However, many models also predict a very high energy (VHE) emission (above hundreds of GeV) when the source displays relativistic persistent jets or transient ejections. Therefore, detecting such emission would improve the understanding of the jet physics. The imaging atmospheric Cherenkov telescope MAGIC observed Cygnus X-3 for about 70 hours between 2006 March and 2009 August in different X-ray/radio spectral states and also during a period of enhanced gamma-ray emission. MAGIC found no evidence for a VHE signal from the direction of the microquasar. An upper limit to the integral flux for energies higher than 250 GeV has been set to 2.2 x 10-12 photons cm-2 s-1 (95% confidence level). This is the best limit so far to the VHE emission from this source. The non-detection of a VHE signal during the period of activity in the high-energy band sheds light on the location of the possible VHE radiation favoring the emission from the innermost region of the jets, where absorption is significant. The current and future generations of Cherenkov telescopes may detect a signal under precise spectral conditions., 14 pages, 11 figures, This manuscript has been accepted by ApJ (2010)
Published: 2010

70. Observations of the Blazar 3C 66A with the MAGIC Telescopes in Stereoscopic Mode

Author: Denis Bastieri, A. Saggion, Q. Weitzel, Tihomir Surić, Ignasi Reichardt, Adrian Biland, G. Maneva, Francesco Dazzi, Thomas Bretz, S. N. Shore, Miguel A. Sánchez-Conde, D. Elsaesser, E. Leonardo, S. Rügamer, Silvia Pardo, Elina Lindfors, Antonio Stamerra, Juan Abel Barrio, Karl Mannheim, Ivica Puljak, T. Jogler, D. Borla Tridon, J. Rico, Daniel Mazin, V. Scalzotto, D. Dominis Prester, Pierre Colin, B. Huber, J. Krause, Wolfgang Rhode, R. G. Pegna, Manel Errando, R. J. García López, M. Salvati, B. De Lotto, Andrei Berdyugin, P. G. Prada Moroni, Agnieszka Sierpowska-Bartosik, J. Storz, Dario Hrupec, Francisco Prada, D. Hildebrand, L. Peruzzo, M. Camara, A. Boller, M. A. Lopez, L. Cossio, Fabio Zandanel, M. Thom, M. Shayduk, F. De Sabata, S. Klepser, Takashi Saito, C. Schultz, Massimo Persic, A. Sillanpää, Pol Bordas, Stefano Covino, Artemio Herrero, Tomislav Terzić, Jose Luis Contreras, Aaron Dominguez, Nijil Mankuzhiyil, M. V. Fonseca, D. Bose, T. Krähenbühl, K. Berger, Felicitas Pauss, Daniel Ferenc, N. Puchades, Juan Cortina, Wlodek Bednarek, Alessandro Carosi, H. Vankov, A. La Barbera, N. Strah, Victor Zabalza, Reiko Orito, Riccardo Paoletti, Ilana M. Braun, B. Steinke, E. De Cea del Pozo, D. Tescaro, D. Garrido, Diego F. Torres, Jose Miguel Miranda, Felix Spanier, M. Pasanen, E. Prandini, L. A. Antonelli, Laura Maraschi, M. I. Martínez, M. Doert, Abelardo Moralejo, Michael Backes, Igor Oya, Fabrizio Tavecchio, Daniel Kranich, Ll. Font, K. Saito, J. Becerra González, Kari Nilsson, R. Reinthal, D. Hadasch, Damir Lelas, Masahiro Teshima, Patrick Vogler, Dorota Sobczyńska, A. Diago Ortega, Robert Wagner, Hiroko Miyamoto, Mario Meucci, S. Partini, Francesco Longo, D. Höhne-Mönch, Jelena Aleksić, Parthasarathi Majumdar, Josep M. Paredes, Javier Moldon, S. Spiro, E. Lorenz, Konstancja Satalecka, Michele Doro, Martin Makariev, Oscar Blanch, T. Schweizer, Valentí Bosch-Ramon, V. Scapin, Gianluca Giavitto, A. Cañellas, Julian Sitarek, J. Hose, Mosè Mariotti, Daniela Dorner, Saverio Lombardi, J. Pochon, E. Colombo, Ralph Bock, L. O. Takalo, Petar Temnikov, Elisa Bernardini, P. Antoranz, C. Delgado Mendez, J. C. Struebig, Roberta Zanin, Miguel A. Pérez-Torres, Marc Ribó, Nikola Godinovic, M. De Maria, A. De Angelis, Giacomo Bonnoli, Daniel Nieto, R. Mirzoyan, E. Carmona, Markus Garczarczyk, Universitat de Barcelona, J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, J. A., Barrio, D., Bastieri, Gonzalez, J., W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, O., Blanch, R. K., Bock, A., Boller, G., Bonnoli, P., Borda, Tridon, D., V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, M., Camara, A., Ca\~nella, E., Carmona, A., Carosi, P., Colin, E., Colombo, J. L., Contrera, J., Cortina, L., Cossio, S., Covino, F., Dazzi, Angelis, A., Cea, E., Lotto, B., Maria, M., Sabata, F., Mendez, C., Ortega, A., M., Doert, A., Dom\inguez, Prester, D., D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J., Garc\ia, M., Garczarczyk, G., Giavitto, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., H\ohne M\onch, J., Hose, D., Hrupec, T., Jogler, S., Klepser, T., Kr\ahenb\uhl, D., Kranich, J., Krause, Barbera, A., E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, M., Makariev, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Mart\inez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, A., Moralejo, D., Nieto, K., Nilsson, R., Orito, I., Oya, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, J., Pochon, F., Prada, P. G., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, R., Reinthal, W., Rhode, M., Ribo, J., Rico, S., R\ugamer, A., Saggion, K., Saito, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanp\a\a, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J., Storz, N., Strah, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, M., Thom, D. F., Torre, H., Vankov, R. M., Wagner, Q., Weitzel, V., Zabalza, F., Zandanel, and R., Zanin
Subjects: galaxies [Gamma rays], individual: 3C 66A [BL Lacertae objects], Radio galaxy, CHERENKOV TELESCOPE, Astrophysics, BL Lacertae objects: individual (3C 66A), 01 natural sciences, Raigs gamma, MAGIC (telescope), Absorption (logic), 010303 astronomy & astrophysics, Physics, astro-ph.HE, High Energy Astrophysical Phenomena (astro-ph.HE), TEV BLAZARS, Extragalactic background light, BL LACERTAE OBJECTS, EXTRAGALACTIC BACKGROUND LIGHT, HIGH-ENERGY EMISSION, GAMMA-RAY EMISSION, PROTON BLAZAR, LAC OBJECTS, X-RAY, SPECTRA, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, BL Lacertae objects: individual: 3C 66A, BL Lac object, individual (3C 66A) [BL Lacertae objects], active [Galaxies], BL Lacertae objects: individual (3C 66A) — galaxies: active — gamma rays: galaxies, galaxies: active, FOS: Physical sciences, 0103 physical sciences, gamma rays: galaxies, Blazar, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Redshift, Crab Nebula, Space and Planetary Science, Galàxies actives, Active galaxies
Abstract: 5 páginas, 3 figuras, 1 tabla.-- El Pdf del artículo es la versión pre-print: arXiv:1010.0550.-- et al., We report new observations of the intermediate-frequency peaked BL Lacertae object 3C 66A with the MAGIC telescopes. The data sample we use were taken in 2009 December and 2010 January, and comprises 2.3 hr of good quality data in stereoscopic mode. In this period, we find a significant signal from the direction of the blazar 3C 66A. The new MAGIC stereoscopic system is shown to play an essential role for the separation between 3C 66A and the nearby radio galaxy 3C 66B, which is at a distance of only 6'. The derived integral flux above 100 GeV is 8.3% of the Crab Nebula flux and the energy spectrum is reproduced by a power law of photon index 3.64 ± 0.39stat ± 0.25sys. Within errors, this is compatible with the one derived by VERITAS in 2009. From the spectra corrected for absorption by the extragalactic background light, we only find small differences between the four models that we applied, and constrain the redshift of the blazar to z < 0.68., This work was also supported by the Marie Curie program, by the CPAN CSD2007-00042 and MultiDark CSD2009-00064 projects of the Spanish Consolider-Ingenio 2010 programme, by grant DO02-353 of the Bulgarian NSF, by grant 127740 of the Academy of Finland, by the YIP of the Helmholtz Gemeinschaft, by the DFG Cluster of Excellence “Origin and Structure of the Universe,” and by the Polish MNiSzW Grant N N203 390834.
Published: 2010
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71. Detection of very high energy γ-ray emission from the Perseus cluster Head-Tail Galaxy IC 310 by the MAGIC telescopes

Author: D. Bose, T. Krähenbühl, J. Becerra González, Diego F. Torres, M. Pasanen, Mario Meucci, M. Doert, Michael Backes, Abelardo Moralejo, E. De Cea del Pozo, N. Strah, M. Shayduk, Stefano Covino, Marc Ribó, Riccardo Paoletti, A. Pinzke, Aaron Dominguez, Nijil Mankuzhiyil, K. Berger, Felicitas Pauss, Victor Zabalza, Manel Errando, D. Tescaro, J. M. Paredes, Antonio Stamerra, Fabio Zandanel, K. Saito, A. La Barbera, T. Schweizer, S. Rügamer, R. J. García López, Agnieszka Sierpowska-Bartosik, Juan Abel Barrio, D. Borla Tridon, Jose Luis Contreras, J. Krause, B. De Lotto, Massimo Persic, Juan Cortina, A. De Angelis, S. Partini, Felix Spanier, Giacomo Bonnoli, J. Storz, Takashi Saito, A. Cañellas, Francesco Longo, D. Höhne-Mönch, Christoph Pfrommer, Reiko Orito, L. Maraschi, Elina Lindfors, Ignasi Reichardt, A. Boller, S. Klepser, D.V. Semikoz, M. Camara, Pierre Colin, L. Cossio, N. Puchades, Masahiro Teshima, Andrei Berdyugin, L. A. Antonelli, A. Diago Ortega, Robert Wagner, Daniel Mazin, T. Jogler, Pratik Majumdar, M. V. Fonseca, M. Salvati, Hiroko Miyamoto, Jelena Aleksić, R. G. Pegna, C. Schultz, Thomas Bretz, S. N. Shore, F. De Sabata, Mosè Mariotti, G. Maneva, A. Sillanpää, Artemio Herrero, Nikola Godinovic, Igor Oya, Fabrizio Tavecchio, Daniel Kranich, Ll. Font, D. Dominis Prester, A. Saggion, Denis Bastieri, Q. Weitzel, Adrian Biland, Tihomir Surić, Daniel Nieto, M. De Maria, B. Steinke, Kari Nilsson, Saverio Lombardi, Pol Bordas, Wolfgang Rhode, Tomislav Terzić, Javier Moldon, Francisco Prada, J. Pochon, Julian Sitarek, S. Spiro, E. Lorenz, Daniel Ferenc, Andrii Neronov, Martin Makariev, Oscar Blanch, Karl Mannheim, J. Hose, Daniela Hadasch, H. Vankov, Ilana M. Braun, V. Scalzotto, E. Colombo, Wlodek Bednarek, Alessandro Carosi, Konstancja Satalecka, Michele Doro, Jose Miguel Miranda, Ralph Bock, P. Antoranz, L. O. Takalo, Dario Hrupec, M. A. Lopez, E. Prandini, R. Reinthal, Dominik Elsaesser, Dorota Sobczyńska, R. Mirzoyan, E. Carmona, Markus Garczarczyk, Valentí Bosch-Ramon, V. Scapin, Gianluca Giavitto, Daniela Dorner, J. C. Struebig, Petar Temnikov, Roberta Zanin, Elisa Bernardini, Miguel A. Pérez-Torres, C. Delgado Mendez, Francesco Dazzi, J. Rico, Miguel A. Sánchez-Conde, E. Leonardo, D. Hildebrand, L. Peruzzo, M. I. Martínez, P. G. Prada Moroni, I. Puljak, J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, J. A., Barrio, D., Bastieri, J. B., Gonzalez, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, O., Blanch, R. K., Bock, A., Boller, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, M., Camara, A., Canella, E., Carmona, A., Carosi, P., Colin, E., Colombo, J. L., Contrera, J., Cortina, L., Cossio, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A. D., Ortega, M., Doert, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J. G., Lopez, M., Garczarczyk, G., Giavitto, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, J., Krause, A. L., Barbera, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, M., Makariev, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, A., Moralejo, D., Nieto, K., Nilsson, R., Orito, I., Oya, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, J., Pochon, F., Prada, P. G. P., Moroni, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, R., Reinthal, W., Rhode, M., Ribo, J., Rico, S., Rugamer, A., Saggion, K., Saito, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J., Storz, N., Strah, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, D. F., Torre, H., Vankov, R. M., Wagner, Q., Weitzel, V., Zabalza, F., Zandanel, R., Zanin, A., Neronov, C., Pfrommer, A., Pinzke, D. V., Semikoz, APC - THEORIE, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), MAGIC, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut für theoretische Physik, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik
Subjects: [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, gamma rays: galaxies, galaxies: individual: IC310, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, Raigs gamma, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Galaxies, galaxies: individual: IC 310, 0103 physical sciences, MAGIC (telescope), Cosmic rays, 010303 astronomy & astrophysics, Galaxy cluster, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, Spectral index, 010308 nuclear & particles physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Gamma rays, Astronomy and Astrophysics, gamma rays: galaxies — galaxies: active — galaxies: individual (IC 310), Galaxy, Galàxies, Crab Nebula, Space and Planetary Science, ddc:520, Spectral energy distribution, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope
Abstract: We report on the detection with the MAGIC telescopes of very high energy gamma-rays from IC 310, a head-tail radio galaxy in the Perseus galaxy cluster, observed during the interval November 2008 to February 2010. The Fermi satellite has also detected this galaxy. The source is detected by MAGIC at a high statistical significance of 7.6sigma in 20.6 hr of stereo data. The observed spectral energy distribution is flat with a differential spectral index of -2.00 \pm 0.14. The mean flux above 300 GeV, between October 2009 and February 2010, (3.1 \pm 0.5)x10^{-12} cm^{-2} s^{-1}, corresponds to (2.5 \pm 0.4)% of Crab Nebula units. Only an upper limit, of 1.9% of Crab Nebula units above 300 GeV, was obtained with the 2008 data. This, together with strong hints (>3sigma) of flares in the middle of October and November 2009, implies that the emission is variable. The MAGIC results favour a scenario with the very high energy emission originating from the inner jet close to the central engine. More complicated models than a simple one-zone SSC scenario, e.g. multi-zone SSC, external Compton or hadronic, may be required to explain the very flat spectrum and its extension over more than three orders of magnitude in energy., 6 pages, 5 figures, submitted to ApJL
Published: 2010

72. Search for an extended VHE gamma-ray emission from Mrk 421 and Mrk 501 with the MAGIC Telescope

Author: MAGIC Collaboration, Aleksić, J., Antonelli, L. A., Antoranz, P., Backes, M., Baixeras, C., Barrio, J. A., Bastieri, D., González, J. Becerra, Bednarek, W., Berdyugin, A., Berger, K., Bernardini, E., Biland, A., Blanch, O., Bock, R. K., Bonnoli, G., Bordas, P., Tridon, D. Borla, Bosch-Ramon, V., Bose, D., Braun, I., Bretz, T., Britzger, D., Camara, M., Carmona, E., Carosi, A., Colin, P., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Covino, S., Dazzi, F., De Angelis, A., del Pozo, E. De Cea, Reyes, R. De los, De Lotto, B., De Maria, M., De Sabata, F., Mendez, C. Delgado, Doert, M., Domínguez, A., Prester, D. Dominis, Dorner, D., Doro, M., Elsaesser, D., Errando, M., Ferenc, D., Fonseca, M. V., Font, L., López, R. J. García, Garczarczyk, M., Gaug, M., Godinovic, N., Hadasch, D., Herrero, A., Hildebrand, D., Höhne-Mönch, D., Hose, J., Hrupec, D., Hsu, C. C., Jogler, T., Klepser, S., Krähenbühl, T., Kranich, D., La Barbera, A., Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, F., López, M., Lorenz, E., Majumdar, P., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., Miranda, J. M., Mirzoyan, R., Miyamoto, H., Moldón, J., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Orito, R., Oya, I., Paiano, S., Paoletti, R., Paredes, J. M., Partini, S., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R. G., Perez-Torres, M. A., Persic, M., Peruzzo, L., Prada, F., Prandini, E., Puchades, N., Puljak, I., Reichardt, I., Rhode, W., Ribó, M., Rico, J., Rissi, M., Rügamer, S., Saggion, A., Saito, T. Y., Salvati, M., Sánchez-Conde, M., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shayduk, M., Shore, S. N., Sierpowska-Bartosik, A., Sillanpää, A., Sitarek, J., Sobczynska, D., Spanier, F., Spiro, S., Stamerra, A., Steinke, B., Struebig, J. C., Suric, T., Takalo, L., Tavecchio, F., Temnikov, P., Terzic, T., Tescaro, D., Teshima, M., Torres, D. F., Vankov, H., Wagner, R. M., Weitzel, Q., Zabalza, V., Zandanel, F., Zanin, R., Neronov, A., Semikoz, D. V., INTEGRAL Science Data Center (ISDC), Geneva Observatory, University of Geneva [Switzerland]-University of Geneva [Switzerland], APC - THEORIE, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), MAGIC, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut für theoretische Physik, Université de Genève = University of Geneva (UNIGE)-Université de Genève = University of Geneva (UNIGE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut für theoretische Physik, J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, D., Bastieri, J. B., Gonzalez, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, O., Blanch, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., De los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, M., Doert, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, S., Paiano, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, D. F., Torre, H., Vankov, R. M., Wagner, Q., Weitzel, V., Zabalza, F., Zandanel, R., Zanin, A., Neronov, and D. V., Semikoz
Subjects: Photon, INTERGALACTIC MAGNETIC-FIELDS, Astrophysics, 01 natural sciences, MARKARIAN-421, galaxies: active, gamma-rays: galaxies, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, TEV ENERGY-SPECTRUM, EXTRAGALACTIC BACKGROUND LIGHT, ACTIVE GALACTIC NUCLEI, RADIATION-FIELDS, RADIO GALAXY, CRAB-NEBULA, SYSTEM, HEGRA, Gamma ray, Extragalactic background light, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, γ-rays: galaxies, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Point source, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Context (language use), Astrophysics::Cosmology and Extragalactic Astrophysics, 0103 physical sciences, Blazar, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Compton scattering, Astronomy and Astrophysics, Galaxies, Galàxies, Crab Nebula, 13. Climate action, Space and Planetary Science, ddc:520
Abstract: Context: Part of the very high energy $��$-ray radiation coming from extragalactic sources is absorbed through the pair production process on the extragalactic background light photons. Extragalactic magnetic fields alter the trajectories of these cascade pairs and, in turn, convert cosmic background photons to gamma-ray energies by inverse Compton scattering. These secondary photons can form an extended halo around bright VHE sources. Aims: We searched for an extended emission around the bright blazars Mrk 421 and Mrk 501 using the MAGIC telescope data. Methods: If extended emission is present, the angular distribution of reconstructed gamma-ray arrival directions around the source is broader than for a point-like source. In the analysis of a few tens of hours of observational data taken from Mrk 421 and Mrk 501 we used a newly developed method that provides better angular resolution. This method is based on the usage of multidimensional decision trees. Comparing the measured shapes of angular distributions with those expected from a point-like source one can detect or constrain possible extended emission around the source. We also studied the influence of different types of systematic errors on the shape of the distribution of reconstructed gamma-ray arrival directions for a point source. Results: We present upper limits for an extended emission calculated for both sources for various source extensions and emission profiles. We discuss possible constraints on the extragalactic magnetic fields strength. We obtain upper limits on the extended emission around the Mrk~421 (Mrk~501) on the level of < 5% (< 4%) of the Crab Nebula flux above the energy threshold of 300 GeV. Using these results we discuss possible constraints on the extragalactic magnetic fields strength around a few times $10^{-15}$~G., 8 pages, 9 figures, accepted for publication in A&A
Published: 2010

73. Search for very high energy gamma-ray emission from pulsar-pulsar wind nebula systems with the Magic telescope

Author: M. Camara, Valentí Bosch-Ramon, L. A. Antonelli, Pierre Colin, Pratik Majumdar, M. V. Fonseca, M. Rissi, E. De Cea del Pozo, V. Scapin, Ignasi Reichardt, Aaron Dominguez, S. Balestra, Felicitas Pauss, Fabio Zandanel, L. O. Takalo, R. Mirzoyan, M. Garczarczyk, Victor Zabalza, E. Carmona, Konstancja Satalecka, Michele Doro, Ismaël Cognard, Igor Oya, Denis Bastieri, I. Puljak, Roberta Zanin, A. De Angelis, D. Elsaesser, M. Salvati, Fabrizio Tavecchio, Manel Errando, J. M. Paredes, Antonio Stamerra, G. Maneva, B. De Lotto, Tihomir Surić, Daniel Kranich, D. Dominis Prester, Daniela Dorner, Thomas Bretz, S. N. Shore, Florian Goebel, A. Sillanpää, M. Shayduk, Elina Lindfors, Mosè Mariotti, Ll. Font, Saverio Lombardi, Kari Nilsson, A. Saggion, M. López, Daniel Mazin, Nijil Mankuzhiyil, D. Britzger, Nicola Galante, Adrian Biland, R. G. Pegna, A. Laille, Markus Gaug, Dorota Sobczyńska, Miguel A. Pérez-Torres, R. Firpo, C. Baixeras, Robert Wagner, Petar Temnikov, S. Rügamer, Wolfgang Rhode, Stefano Covino, Elisa Bernardini, Juan Abel Barrio, Daniel Nieto, F. De Sabata, Pol Bordas, D. Bose, R. de los Reyes, Nicola Turini, J. Zapatero, E. Prandini, Francisco Prada, R. K. Bock, T. Schweizer, Karl Mannheim, Hiroko Miyamoto, R. J. García López, D. Borla Tridon, Jose Luis Contreras, Stefan Klepser, L. S. Stark, Julia Becker, N. Puchades, S. Commichau, Artemio Herrero, Agnieszka Sierpowska-Bartosik, D. Tescaro, Wlodek Bednarek, Alessandro Carosi, Marc Ribó, A. Robert, Juan Cortina, Laura Maraschi, M. T. Costado, Diego F. Torres, A. La Barbera, C. Delgado Mendez, Giacomo Bonnoli, Masahiro Teshima, M. Pasanen, Massimo Persic, D. Hadasch, Riccardo Paoletti, V. Scalzotto, J. Becerra González, P. Antoranz, M. I. Martínez, Jose Miguel Miranda, Abelardo Moralejo, Mario Meucci, Takashi Saito, Mariano Moles, Reiko Orito, Javier Moldon, D. Pascoli, Julian Sitarek, Felix Spanier, S. Spiro, E. Lorenz, J. Hose, al K. Berger, J. Rico, Jelena Ninkovic, D. Hildebrand, L. Peruzzo, Francesco Dazzi, Miguel A. Sánchez-Conde, E. Leonardo, Daniel Ferenc, H. Vankov, Ilana M. Braun, T. Jogler, Francesco Longo, D. Höhne-Mönch, Dario Hrupec, H. Anderhub, Michael Backes, Enrique Fernández, C. C. Hsu, Nikola Godinovic, M. De Maria, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, A. K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, F., Goebel, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, L. S., Stark, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, I., Cognard, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Istituto Nazionale di Astrofisica (INAF), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Technische Universität Dortmund [Dortmund] (TU), Universitat Autònoma de Barcelona (UAB), Universita degli Studi di Padova, University of Lódź, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), and Universitat de Barcelona
Subjects: Astrofísica, CRAB PULSAR, Astrophysics, 7. Clean energy, 01 natural sciences, Pulsar wind nebula, LARGE-AREA TELESCOPE, Pulsar Wind Nebulae, Millisecond pulsar, Gamma ray astronomy, Very High Energy Gamma-ray Astronomy, MAGIC telescope, MAGIC (telescope), MILLISECOND PULSAR, X-RAY, PSR J0218+4232, SOURCE LIST, 3C 58, DISCOVERY, EGRET, RADIATION, 010303 astronomy & astrophysics, Physics, Gamma ray, Threshold energy, Púlsars, Electrónica, Física nuclear, methods: observational, Electricidad, Telescopis espacials, Astrophysics::High Energy Astrophysical Phenomena, Pulsar planet, gamma rays: stars, Space telescopes, Nebulae, Pulsar, 0103 physical sciences, Astronomia de raigs gamma, Pulsars, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, telescopes, pulsars: individual (PSR J0205+6449 PSR J2229+6114 PSR J0218+4232), Stars, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Nebuloses
Abstract: International audience; The MAGIC collaboration has searched for high-energy gamma-ray emission of some of the most promising pulsar candidates above an energy threshold of 50 GeV, an energy not reachable up to now by other ground-based instruments. Neither pulsed nor steady gamma-ray emission has been observed at energies of 100 GeV from the classical radio pulsars PSR J0205+6449 and PSR J2229+6114 (and their nebulae 3C58 and Boomerang, respectively) and the millisecond pulsar PSR J0218+4232. Here, we present the flux upper limits for these sources and discuss their implications in the context of current model predictions.
Published: 2010

74. Simultaneous multi-frequency observation of the unknown redshift blazar PG 1553+113 in March-April 2008

Author: E. De Cea del Pozo, B. De Lotto, Stefan Klepser, S. Balestra, M. Shayduk, H. Anderhub, Michael Backes, R. K. Bock, D. Britzger, Nijil Mankuzhiyil, T. Schweizer, M. I. Martínez, L. O. Takalo, Enrique Fernández, Abelardo Moralejo, Dorothee Hildebrand, P. Antoranz, Riccardo Paoletti, C. C. Hsu, C. M. Raiteri, A. Laille, Mosè Mariotti, V. Bianchin, D. Dominis Prester, Nikola Godinovic, M. De Maria, Andrei Berdyugin, D. Pascoli, Manel Errando, R. de los Reyes, Nicola Turini, Francisco Prada, T. Krähenbühl, Saverio Lombardi, Miguel A. Pérez-Torres, Robert Wagner, Ignasi Reichardt, Elina Lindfors, J. M. Paredes, Antonio Stamerra, Francesco Longo, D. Höhne-Mönch, D. Bose, I. Puljak, Fabio Zandanel, Javier Moldon, C. Delgado Mendez, Laura Maraschi, N. Puchades, N. Strah, Dominik Elsaesser, Daniel Mazin, S. Spiro, E. Lorenz, Dario Hrupec, Diego F. Torres, G. Maneva, M. Pasanen, R. Firpo, A. Saggion, M. Salvati, K. Berger, Thomas Bretz, L. A. Antonelli, A. Sillanpää, S. N. Shore, K. Nilsson, Adrian Biland, R. J. García López, Daniela Dorner, R. G. Pegna, C. Baixeras, Jose Luis Contreras, Gabriele Ghisellini, Florian Goebel, Marc Ribó, Konstancja Satalecka, Agnieszka Sierpowska-Bartosik, Masahiro Teshima, J. Rico, Markus Gaug, Juan Cortina, Michele Doro, Aaron Dominguez, M. T. Costado, Igor Oya, Felicitas Pauss, Fabrizio Tavecchio, Daniel Kranich, Hiroko Miyamoto, Massimo Persic, Wolfgang Rhode, Felix Spanier, Ll. Font, Victor Zabalza, L. Peruzzo, Jelena Aleksić, Julian Sitarek, Petar Temnikov, Aldo Treves, J. Hose, Elisa Bernardini, Valentí Bosch-Ramon, M. Villata, V. Scalzotto, Dorota Sobczyńska, V. Scapin, Mariano Moles, G. Di Cocco, Stefano Covino, A. De Angelis, J. Zapatero, D. Tescaro, M. Garczarczyk, A. Herrero, G. Tosti, Jelena Ninkovic, J. C. Struebig, Francesco Dazzi, Miguel A. Sánchez-Conde, E. Leonardo, D. Fugazza, Takashi Saito, Roberta Zanin, Nicola Galante, T. Jogler, E. Prandini, Reiko Orito, Giacomo Bonnoli, Daniel Ferenc, H. Vankov, Ilana M. Braun, D. Hadasch, Pierre Colin, Daniel Nieto, Omar M. Kurtanidze, A. La Barbera, Julia Becker, S. Commichau, Wlodek Bednarek, Alessandro Carosi, Jose Miguel Miranda, Denis Bastieri, Elena Pian, Tihomir Surić, S. Rügamer, Juan Abel Barrio, D. Borla Tridon, Karl Mannheim, M. Camara, Pratik Majumdar, M. V. Fonseca, M. Rissi, J. Becerra González, B. Steinke, M. López, Mario Meucci, F. De Sabata, Pol Bordas, Filippo D'Ammando, R. Mirzoyan, E. Carmona, S. Vercellone, J., Aleksic, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, F., Goebel, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, N., Strah, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, E., Pian, V., Bianchin, F., D'Ammando, G. D., Cocco, D., Fugazza, G., Ghisellini, O. M., Kurtanidze, C. M., Raiteri, G., Tosti, A., Treve, S., Vercellone, M., Villata, Aleksic J, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Balestra S, Barrio JA, Bastieri D, Gonzalez JB, Becker JK, Bednarek W, Berdyugin A, Berger K, Bernardini E, Biland A, Bock RK, Bonnoli G, Bordas P, Tridon DB, Bosch-Ramon V, Bose D, Braun I, Bretz T, Britzger D, Camara M, Carmona E, Carosi A, Colin P, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Dazzi F, De Angelis A, del Pozo ED, De los Reyes R, De Lotto B, De Maria M, De Sabata F, Mendez CD, Dominguez A, Prester DD, Dorner D, Doro M, Elsaesser D, Errando M, Ferenc D, Fernandez E, Firpo R, Fonseca MV, Font L, Galante N, Lopez RJG, Garczarczyk M, Gaug M, Godinovic N, Goebel F, Hadasch D, Herrero A, Hildebrand D, Hohne-Monch D, Hose J, Hrupec D, Hsu CC, Jogler T, Klepser S, Krahenbuhl T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, Lopez M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martinez M, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Miyamoto H, Moldon J, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Orito R, Oya I, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Prada F, Prandini E, Puchades N, Puljak I, Reichardt I, Rhode W, Ribo M, Rico J, Rissi M, Rugamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shore SN, Sierpowska-Bartosik A, Sillanpaa A, Sitarek J, Sobczynska D, Spanier F, Spiro S, Stamerra A, Steinke B, Strah N, Struebig JC, Suric T, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Torres DF, Turini N, Vankov H, Wagner RM, Zabalza V, Zandanel F, Zanin R, Zapatero J, Pian E, Bianchin V, DAmmando F, Di Cocco G, Fugazza D, Ghisellini G, Kurtanidze OM, Raiteri CM, Tosti G, Treves A, Vercellone S, and Villata M
Subjects: galaxies [Gamma rays], Astrophysics, 01 natural sciences, law.invention, ENERGY, Raigs gamma, law, ABSORPTION, MAGIC (telescope), PG-1553+113, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, SPECTROSCOPY, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Galaxies: active, Synchrotron, BL Lacertae objects: individual: PG 1553+113, galaxies [X-rays], Gamma rays: galaxies, astro-ph.CO, Spectral energy distribution, Electrónica, Física nuclear, Raigs X, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, BL-LACERTAE OBJECTS, MAGIC TELESCOPE, VRI PHOTOMETRY, SKY SURVEY, EMISSION, SPECTRA, Cosmology and Nongalactic Astrophysics (astro-ph.CO), active [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, 0103 physical sciences, X-rays, Blazar, 010308 nuclear & particles physics, individual: PG 1553+113 [BL Lacertae objects], Gamma rays, Astronomy and Astrophysics, Galaxies, Redshift, Galàxies, Gamma rays: observation, Gamma rays: theory, X-rays: galaxies, BL Lacertae objects: individual: PG 1553+113 / X-rays: galaxies / gamma rays: galaxies / galaxies: active, Space and Planetary Science, ddc:520
Abstract: 5 páginas, 2 figuras, 3 tablas.-- El Pdf del artículo es la versión pre-print: arXiv: arXiv:0911.1088.-- MAGIC Collaboration: et al., The blazar PG 1553+113 is a well known TeV γ-ray emitter. In this paper we determine its spectral energy distribution through simultaneous multi-frequency data to study its emission processes. An extensive campaign was carried out between March and April 2008, where optical, X-ray, high-energy (HE) γ-ray, and very-high-energy (VHE) γ-ray data were obtained with the KVA, Abastumani, REM, RossiXTE/ASM, AGILE and MAGIC telescopes, respectively. We combine the data to derive the source's spectral energy distribution and interpret its double-peaked shape within the framework of a synchrotron self-Compton model., Major support from Germany’s Bundesministerium f¨ur Bildung, Wissenschaft, Forschung und Technologie and Max-Planck-Gesellschaft, Italy’s Istituto Nazionale di Fisica Nucleare (INFN) and Istituto Nazionale di Astrofisica (INAF), and Spain’s Ministerio de Ciencia e Innovacion is gratefully acknowledged. The work was also supported by Switzerland’s ETH Research grant TH34/043, Poland’s Ministertwo Nauki i Szkolnictwa Wy˙zszego grant N N203 390834, and Germany’s Young Investigator Program of the Helmholtz Gemeinschaft. This work was also supported by Georgian National Science Foundation grant GNSF/ST07/4-180. EP acknowledges support from the Italian Space Agency through grants ASI-INAF I/023/05/0 and ASI I/088/06/0.
Published: 2010

75. MAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006

Author: Pierre Colin, R. J. García López, Agnieszka Sierpowska-Bartosik, Jose Luis Contreras, A. De Angelis, Juan Cortina, Massimo Persic, C. Delgado Mendez, E. Prandini, S. Balestra, Marc Ribó, P. Antoranz, Dorota Sobczyńska, S. Rügamer, M. T. Costado, Thomas Bretz, Daniel Nieto, S. N. Shore, Juan Abel Barrio, Abelardo Moralejo, D. Borla Tridon, L. O. Takalo, K. Berger, Jelena Ninkovic, Stefano Covino, Valentí Bosch-Ramon, I. Puljak, C. C. Hsu, Kari Nilsson, V. Scapin, Mosè Mariotti, Stefan Klepser, Miguel A. Pérez-Torres, D. Hadasch, Laura Maraschi, Nikola Godinovic, M. Doert, Michael Backes, M. De Maria, D. Tescaro, D. Elsaesser, Denis Bastieri, Felix Spanier, M. Camara, V. Scalzotto, Tihomir Surić, Tomislav Terzić, Wolfgang Rhode, Francesco Dazzi, Daniela Dorner, Miguel A. Sánchez-Conde, M. I. Martínez, Riccardo Paoletti, Saverio Lombardi, Daniel Ferenc, J. C. Struebig, D. Bose, E. Leonardo, H. Vankov, Ilana M. Braun, D. Dominis Prester, Pratik Majumdar, Roberta Zanin, M. V. Fonseca, M. Rissi, Elina Lindfors, Daniel Mazin, J. M. Paredes, Antonio Stamerra, D. Britzger, S. Paiano, Petar Temnikov, Giacomo Bonnoli, Diego F. Torres, M. Pasanen, R. G. Pegna, Karl Mannheim, T. Krähenbühl, Francisco Prada, Elisa Bernardini, A. Laille, R. Mirzoyan, Andrei Berdyugin, B. Steinke, M. López, E. Carmona, Markus Garczarczyk, S. Partini, Francesco Longo, D. Höhne-Mönch, N. Puchades, J. Becerra González, B. De Lotto, R. de los Reyes, D. Pascoli, Takashi Saito, F. De Sabata, T. Schweizer, Javier Moldon, E. De Cea del Pozo, Mario Meucci, C. Schultz, Pol Bordas, Aaron Dominguez, Felicitas Pauss, S. Spiro, E. Lorenz, Reiko Orito, Victor Zabalza, A. Herrero, L. A. Antonelli, M. Shayduk, Mariano Moles, J. Rico, Igor Oya, Fabrizio Tavecchio, Daniel Kranich, Nijil Mankuzhiyil, Ll. Font, R. K. Bock, T. Jogler, A. La Barbera, D. Hildebrand, L. Peruzzo, M. Salvati, A. Sillanpää, Dario Hrupec, Masahiro Teshima, Manel Errando, Fabio Zandanel, Konstancja Satalecka, Michele Doro, Robert Wagner, Hiroko Miyamoto, Jelena Aleksić, C. Baixeras, Julian Sitarek, J. Hose, A. Saggion, Adrian Biland, Markus Gaug, Ignasi Reichardt, G. Maneva, S. Commichau, Wlodek Bednarek, Alessandro Carosi, Jose Miguel Miranda, Universitat de Barcelona, J., Aleksic, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, M., Doert, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, N., Strah, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, and R., Zanin
Subjects: galaxies [Gamma rays], PARTICLE-ACCELERATION, Radiation mechanisms: non-thermal, Flux, Astrophysics, 01 natural sciences, Spectral line, law.invention, Raigs gamma, ACTIVE GALAXY MARKARIAN-421, law, Jets (Astrofísica), MAGIC (telescope), 010303 astronomy & astrophysics, Palma (Canary Islands), BL Lacertae objects: individual: Mkn 421, Physics, Spectral index, Palma (Canàries), Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Gamma ray, CORRELATED VARIABILITY, Gamma rays: galaxies, astro-ph.CO, Electrónica, Física nuclear, Electricidad, Telescopis espacials, Astrophysics - Cosmology and Nongalactic Astrophysics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), gamma ray astronomy, IMAGING CHERENKOV DETECTOR, gamma rays: observations, BL Lacertae objects: individual (Mkn 421), FOS: Physical sciences, BLAZAR MARKARIAN-421, Space telescopes, Telescope, BL-LAC OBJECTS, 0103 physical sciences, SPECTRA, Nucli galàctic actiu, Blazar, individual: Mkn 421 [BL Lacertae objects], ATMOSPHERIC CHERENKOV TELESCOPE, HIGH-ENERGY PHOTONS, X-RAY, CRAB-NEBULA, Active galactic nuclei, non-thermal [Radiation mechanisms], 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Light curve, Galaxies, Galàxies, Astrophysical jets, 13. Climate action, Space and Planetary Science, ddc:520
Abstract: 10 páginas, 7 figuras, 6 tablas.-- El Pdf del artículo es la versión pre-print: arXiv:1001.1291.-- MAGIC Collaboration: et al., [Context]: Wide-range spectral coverage of blazar-type active galactic nuclei is of paramount importance for understanding the particle acceleration mechanisms assumed to take place in their jets. The Major Atmospheric Gamma Imaging Cerenkov (MAGIC) telescope participated in three multiwavelength (MWL) campaigns, observing the blazar Markarian (Mkn) 421 during the nights of April 28 and 29, 2006, and June 14, 2006. [Aims]: We analyzed the corresponding MAGIC very-high energy observations during 9 nights from April 22 to 30, 2006 and on June 14, 2006. We inferred light curves with sub-day resolution and night-by-night energy spectra. [Methods]: MAGIC detects γ-rays by observing extended air showers in the atmosphere. The obtained air-shower images were analyzed using the standard MAGIC analysis chain. [Results]: A strong γ-ray signal was detected from Mkn 421 on all observation nights. The flux (E > 250 GeV) varied on night-by-night basis between (0.92±0.11) × 10-10 cm-2 s-1 (0.57 Crab units) and (3.21±0.15) × 10-10 cm-2 s-1 (2.0 Crab units) in April 2006. There is a clear indication for intra-night variability with a doubling time of 36± min on the night of April 29, 2006, establishing once more rapid flux variability for this object. For all individual nights γ-ray spectra could be inferred, with power-law indices ranging from 1.66 to 2.47. We did not find statistically significant correlations between the spectral index and the flux state for individual nights. During the June 2006 campaign, a flux substantially lower than the one measured by the Whipple 10-m telescope four days later was found. Using a log-parabolic power law fit we deduced for some data sets the location of the spectral peak in the very-high energy regime. Our results confirm the indications of rising peak energy with increasing flux, as expected in leptonic acceleration models., The support of the German BMBF and MPG, the Italian INFN and Spanish MICINN is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/043, by the Polish MNiSzW Grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft.
Published: 2010

76. MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275

Author: J. Moldón, Lluis Font, Daniel Nieto, T. Krähenbühl, Stefano Covino, Takashi Saito, S. Commichau, Susumu Inoue, C. C. Hsu, Reiko Orito, Wlodek Bednarek, Alessandro Carosi, R. Mirzoyan, A. De Angelis, Jelena Ninkovic, Nikola Godinovic, N. Puchades, M. Doert, Riccardo Paoletti, Michael Backes, Dominik Elsaesser, Christoph Pfrommer, M. De Maria, Masahiro Teshima, D. Bose, Francesco Dazzi, Miguel A. Pérez-Torres, Ignasi Reichardt, E. Carmona, Markus Garczarczyk, J. Zapatero, E. Leonardo, C. Baixeras, D. Tescaro, J. M. Paredes, Diego F. Torres, Antonio Stamerra, A. La Barbera, Dorota Sobczyńska, Thomas Bretz, F. De Sabata, M. Pasanen, R. J. García López, A. Domínguez, Giacomo Bonnoli, Mariano Moles, Nicola Galante, Pol Bordas, M. Salvati, R. K. Bock, Dario Hrupec, Marc Ribó, S. Rügamer, A. Sillanpää, Agnieszka Sierpowska-Bartosik, M. T. Costado, Abelardo Moralejo, Ivica Puljak, Gabriele Ghisellini, Torsten A. Enßlin, M. Shayduk, D. Borla Tridon, L. Maraschi, Elina Lindfors, M. Sánchez-Conde, Wolfgang Rhode, S. Partini, Francesco Longo, G. Maneva, D. Höhne-Mönch, J. C. Struebig, Felicitas Pauss, Nijil Mankuzhiyil, V. Scalzotto, Roberta Zanin, Victor Zabalza, Manel Errando, Massimo Persic, J. Becerra González, E. De Cea del Pozo, R. G. Pegna, B. De Lotto, P. Temnikov, A. Saggion, L. A. Antonelli, Fabio Zandanel, Julian Sitarek, S. Klepser, Mario Meucci, E. Prandini, J. A. Barrio, Adrian Biland, M. Camara, Tomislav Terzić, A. Laille, Andrei Berdyugin, Pratik Majumdar, M. V. Fonseca, M. Rissi, Igor Oya, Markus Gaug, Denis Bastieri, R. de los Reyes, S. N. Shore, Tihomir Surić, C. Schultz, Jose Luis Contreras, Fabrizio Tavecchio, Daniel Kranich, S. Paiano, Karl Mannheim, B. Steinke, M. López, Juan Cortina, M. I. Martínez, S. Spiro, E. Lorenz, Kari Nilsson, A. Herrero, D. Pascoli, J. Rico, T. Jogler, D. Hildebrand, L. Peruzzo, Daniel Ferenc, H. Vankov, Ilana M. Braun, P. Antoranz, Daniela Dorner, A. Pinzke, D. Britzger, Konstancja Satalecka, Michele Doro, Hiroko Miyamoto, Elisa Bernardini, Jelena Aleksić, T. Schweizer, C. Delgado Mendez, Valentí Bosch-Ramon, V. Scapin, P. Colin, Robert Wagner, D. Dominis Prester, Francisco Prada, K. Berger, Mosè Mariotti, Felix Spanier, J. Hose, Daniela Hadasch, Saverio Lombardi, S. Balestra, Jose Miguel Miranda, L. O. Takalo, D. Mazin, J., Aleksic, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, W., Bednarek, A., Berdyugin, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, D., Britzger, M., Camara, E., Carmona, A., Carosi, P., Colin, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, M., Doert, A., Dominguez, D. D., Prester, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, N., Godinovic, D., Hadasch, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, D., Hrupec, C. C., Hsu, T., Jogler, S., Klepser, T., Krahenbuhl, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, S., Paiano, R., Paoletti, J. M., Parede, S., Partini, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Puljak, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M. A., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, C., Schultz, T., Schweizer, M., Shayduk, S. N., Shore, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, B., Steinke, J. C., Struebig, T., Suric, L., Takalo, F., Tavecchio, P., Temnikov, T., Terzic, D., Tescaro, M., Teshima, D. F., Torre, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, C., Pfrommer, A., Pinzke, T. A., Enlin, S., Inoue, and G., Ghisellini
Subjects: Radio galaxy, Astrophysics, 01 natural sciences, Raigs gamma, Dark Matter, MAGIC (telescope), Very High Energy Gamma-ray Astronomy, MAGIC telescope, Galaxy Cluster, 010303 astronomy & astrophysics, gamma-rays: observations, galaxies: clusters: individual (Perseus), High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, Clusters of galaxies, FLUX-LIMITED SAMPLE, COSMOLOGICAL SIMULATIONS, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, HARD X-RAY, Cúmuls de galàxies, ACTIVE GALACTIC NUCLEI, PARTICLE HYDRODYNAMICS SIMULATIONS, COMA CLUSTER, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Cooling flow, MAGNETIC-FIELDS, RADIO HALOS, 0103 physical sciences, Cosmic rays, Galaxy cluster, Astrophysics::Galaxy Astrophysics, HESS OBSERVATIONS, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Galaxy, gamma ray astronomy, INTERGALACTIC MEDIUM, Space and Planetary Science, Fermi Gamma-ray Space Telescope
Abstract: The Perseus galaxy cluster was observed by the MAGIC Cherenkov telescope for a total effective time of 24.4 hr during 2008 November and December. The resulting upper limits on the gamma-ray emission above 100 GeV are in the range of 4.6 to 7.5 x 10^{-12} cm^{-2} s^{-1} for spectral indices from -1.5 to -2.5, thereby constraining the emission produced by cosmic rays, dark matter annihilations, and the central radio galaxy NGC1275. Results are compatible with cosmological cluster simulations for the cosmic-ray-induced gamma-ray emission, constraining the average cosmic ray-to-thermal pressure to, 15 pages, 5 figures; accepted for publication in ApJ; updated to match the journal final version
Published: 2009

77. Simultaneous Multiwavelength observation of Mkn 501 in a low state in 2006

Author: Anderhub, H., Antonelli, L. A., Bednarek, W., Peruzzo, L., Prada, F., Prandini, E., Puchades, N., Reichardt, I., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Berger, K., Rügamer, S., Saggion, A., Saito, T. Y., Salvati, M., Sanchez-Conde, M., Satalecka, K., Scalzotto, V., Scapin, V., Schweizer, T., Shayduk, M., Bernardini, E., Shore, S. N., Sidro, N., Sierpowska-Bartosik, A., Sillanpää, A., Sitarek, J., Sobczynska, D., Spanier, F., Stamerra, A., Stark, L. S., Takalo, L., Biland, A., Tavecchio, F., Temnikov, P., Tescaro, D., Teshima, M., Tluczykont, M., Torres, D. F., Turini, N., Vankov, H., Wagner, R. M., Wittek, W., Bock, R. K., Zabalza, V., Zandanel, F., Zanin, R., Zapatero, J., Sato, R., Ushio, M., Kataoka, J., Madejski, G., Takahashi, T., MAGIC Collaboration, Bonnoli, G., Bordas, P., Tridon, D. Borla, Bosch-Ramon, V., Bose, D., Antoranz, P., Braun, I., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Covino, S., Backes, M., Curtef, V., Dazzi, F., De Angelis, A., Pozo, E. De Cea del, Reyes, R. de los, De Lotto, B., De Maria, M., De Sabata, F., Mendez, C. Delgado, Dominguez, A., Baixeras, C., Dorner, D., Doro, M., Elsaesser, D., Errando, M., Ferenc, D., Fernández, E., Firpo, R., Fonseca, M. V., Font, L., Galante, N., Balestra, S., López, R. J. García, Garczarczyk, M., Gaug, M., Goebel, F., Hadasch, D., Hayashida, M., Herrero, A., Hildebrand, D., Höhne-Mönch, D., Hose, J., Barrio, J. A., Hsu, C. C., Jogler, T., Kranich, D., Barbera, A. La, Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, F., López, M., Bastieri, D., Lorenz, E., Majumdar, P., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., González, J. Becerra, Meyer, M., Miranda, J. M., Mirzoyan, R., Miyamoto, H., Moldón, J., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Becker, J. K., Otte, N., Oya, I., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R. G., Perez-Torres, M. A., Persic, M., H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, I., Britvitch, M., Camara, E., Carmona, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. d., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, C. C., Hsu, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, N., Otte, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, R., Sato, M., Ushio, J., Kataoka, G., Madejski, T., Takahashi, and Universitat de Barcelona
Subjects: GAMMA-RAY OBSERVATION, Photon, PARTICLE-ACCELERATION, Flux, Astrophysics, Electron, 01 natural sciences, Spectral line, Raigs gamma, Observacions astronòmiques, TEV BLAZAR, MAGIC (telescope), 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Lorentz factor, symbols, Electrónica, Física nuclear, Raigs X, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Astronomical observations, ACTIVE GALACTIC NUCLEI, Cosmology and Nongalactic Astrophysics (astro-ph.CO), GALAXY MARKARIAN-421, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, BL-LACERTAE OBJECTS, HIGH-ENERGY EMISSION, X-RAY, LAC OBJECTS, PHYSICAL PARAMETERS, symbols.namesake, 0103 physical sciences, X-rays, Blazar, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Galaxies, Galàxies, Crab Nebula, Space and Planetary Science, ddc:520
Abstract: 著者人数：149名, Accepted: 2009-09-28, 資料番号: SA1000976000
Published: 2009
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78. SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS OF MARKARIAN 421 DURING OUTBURST

Author: Acciari, Va, Aliu, E, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Bradbury, Sm, Buckley, Jh, Bugaev, V, Butt, Y, Cannon, A, Celik, O, Cesarini, A, Chow, Yc, Ciupik, L, Cogan, P, Colin, P, Cui, W, Dickherber, R, Duke, C, Falcone, Ad, Fegan, Sj, Finley, Jp, Finnegan, G, Fortin, P, Fortson, L, Furniss, A, Gall, D, Gillanders, Gh, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Horan, D, Hui, Cm, Humensky, Tb, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Kildea, J, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, Mj, Lebohec, S, Maier, G, Mccann, A, Millis, J, Moriarty, P, Ong, Ra, Otte, An, Pandel, D, Perkins, Js, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reyes, Lc, Reynolds, Pt, Roache, E, Rose, Hj, Schroedter, M, Sembroski, Gh, Smith, Aw, Steele, D, Swordy, Sp, Theiling, M, Toner, Ja, Varlotta, A, Vincent, S, Wakely, Sp, Ward, Je, Weekes, Tc, Weinstein, A, Weisgarber, T, Williams, Da, Wissel, S, Zitzer, B, Perez, Id, Ibarra, A, Anderhub, Prh, Antonelli, La, Antoranz, P, Backes, M, Baixeras, C, Balestra, S, Barrio, Ja, Bastieri, D, Gonzalez, Jb, Becker, Jk, Bednarek, W, Berger, K, Bernardini, E, Biland, A, Bock, Rk, Bonnoli, G, Bordas, P, Tridon, Db, Bosch Ramon, V, Bose, D, Braun, I, Bretz, T, Britvitch, I, Camara, M, Carmona, E, Carosi, A, Commichau, S, Contreras, Jl, Cortina, J, Costado, Mt, Covino, S, Curtef, V, Dazzi, F, DE ANGELIS, Alessandro, Del Pozo ED, Mendez, Cd, De Los Reyes, R, DE LOTTO, Barbara, De Maria, M, De Sabata, F, Dominguez, A, Dorner, D, Doro, M, Elsaesser, D, Errando, M, Ferenc, D, Fernandez, E, Firpo, R, Fonseca, Mv, Font, L, Galante, N, Lopez, Rj, Garczarczyk, M, Gaug, M, Goebel, F, Hadasch, D, Hayashida, M, Herrero, A, Hildebrand, D, Hohne Monch, D, Hose, J, Hsu, Cc, Jogler, T, Kranich, D, La Barbera, A, Laille, A, Leonardo, E, Lindfors, E, Lombardi, S, Longo, F, Lopez, M, Lorenz, E, Majumdar, P, Maneva, G, Mankuzhiyil, N, Mannheim, K, Maraschi, L, Mariotti, M, Martinez, M, Mazin, D, Meucci, M, Miranda, Jm, Mirzoyan, R, Miyamoto, H, Moldon, J, Moles, M, Moralejo, A, Nieto, D, Nilsson, K, Ninkovic, J, Orito, R, Oya, I, Paoletti, R, Paredes, Jm, Pasanen, M, Pascoli, D, Pauss, F, Pegna, Rg, Perez Torres MA, Persic, M, Peruzzo, L, Prada, F, Prandini, E, Puchades, N, Reichardt, I, Rhode, W, Ribo, M, Rico, J, Rissi, M, Robert, A, Rugamer, S, Saggion, A, Saito, Ty, Salvati, M, Sanchez Conde, M, Satalecka, K, Scalzotto, V, Scapin, V, Schweizer, T, Shayduk, M, Shore, Sn, Sidro, N, Sierpowska Bartosik, A, Silanpaa, A, Sitarek, J, Sobczynska, D, Spanier, F, Spiro, S, Stamerra, A, Stark, Ls, Takalo, L, Tavecchio, F, Temnikov, P, Tescaro, D, Teshima, M, Tluczykont, M, Torres, Df, Turini, N, Vankov, H, Wagner, Rm, Zabalza, V, Zandanel, F, Zanin, R, Zapatero, J., V. A., Acciari, E., Aliu, T., Aune, M., Beilicke, W., Benbow, M., Bottcher, S. M., Bradbury, J. H., Buckley, V., Bugaev, Y., Butt, A., Cannon, O., Celik, A., Cesarini, Y. C., Chow, L., Ciupik, P., Cogan, P., Colin, W., Cui, R., Dickherber, C., Duke, A. D., Falcone, S. J., Fegan, J. P., Finley, G., Finnegan, P., Fortin, L., Fortson, A., Furni, D., Gall, G. H., Gillander, J., Grube, R., Guenette, G., Gyuk, D., Hanna, J., Holder, D., Horan, C. M., Hui, T. B., Humensky, P., Kaaret, N., Karlsson, M., Kertzman, D., Kieda, J., Kildea, A., Konopelko, H., Krawczynski, F., Krennrich, M. J., Lang, S., Lebohec, G., Maier, A., Mccann, J., Milli, P., Moriarty, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, A., Pichel, M., Pohl, J., Quinn, K., Ragan, L. C., Reye, P. T., Reynold, E., Roache, H. J., Rose, M., Schroedter, G. H., Sembroski, A. W., Smith, D., Steele, S. P., Swordy, M., Theiling, J. A., Toner, A., Varlotta, S., Vincent, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, T., Weisgarber, D. A., William, S., Wissel, B., Zitzer, I. D., Perez, A., Ibarra, P. R. H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Carosi, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., Del Pozo, C. D., Mendez, R. D., Los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, C. C., Hsu, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, R., Orito, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Silanpaa, J., Sitarek, D., Sobczynska, F., Spanier, S., Spiro, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, and Universitat de Barcelona
Subjects: bl lacertae objects: individual (markarian 421), 01 natural sciences, law.invention, ENERGY, Raigs gamma, ACTIVE GALAXY MARKARIAN-421, law, Observacions astronòmiques, RAY SPECTRAL VARIABILITY, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Astrophysics::Instrumentation and Methods for Astrophysics, CORRELATED VARIABILITY, TEV PHOTONS, Wavelength, Electrónica, Física nuclear, Raigs X, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Astronomical observations, GALACTIC NUCLEI, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Telescope, 0103 physical sciences, X-rays, Blazar, x-rays: galaxies, XMM-NEWTON, 010308 nuclear & particles physics, Gamma rays, GAMMA-RAYS, Astronomy, Spectral density, Astronomy and Astrophysics, radiation mechanisms: non-thermal, Galaxies, Galàxies, MAGIC TELESCOPE, RADIATION, 13. Climate action, Space and Planetary Science, Satellite, gamma rays: observations
Abstract: We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, while the gamma-ray data were obtained utilizing three imaging atmospheric Cerenkov telescopes, the Whipple 10m telescope and VERITAS, both based in Arizona, as well as the MAGIC telescope, based on La Palma in the Canary Islands. The coordinated effort between the gamma-ray groups allowed for truly simultaneous data in UV/X-ray/gamma-ray wavelengths during a significant portion of the XMM-Newton observations. This simultaneous coverage allowed for a reliable search for correlations between UV, X-ray and gamma-ray variability over the course of the observations. Investigations of spectral hysteresis and modeling of the spectral energy distributions are also presented., Comment: 27 pages, 5 figures, Accepted for publication in The Astrophysical Journal
Published: 2009

79. SEARCH FOR VHE gamma-RAY EMISSION FROM THE GLOBULAR CLUSTER M13 WITH THE MAGIC TELESCOPE

Author: A. Saggion, Adrian Biland, Markus Gaug, Dorota Sobczyńska, L. S. Stark, S. Rügamer, Juan Abel Barrio, Francisco Prada, Abelardo Moralejo, Mosè Mariotti, A. Robert, D. Borla Tridon, Enrique Fernández, H. Anderhub, Aaron Dominguez, Felicitas Pauss, Julian Sitarek, J. Hose, Konstancja Satalecka, C. C. Hsu, C. Baixeras, K. Berger, Michele Doro, Denis Bastieri, M. Salvati, Daniela Dorner, D. Elsaesser, Michael Backes, Mariano Moles, M. Camara, Takashi Saito, A. Sillanpää, Victor Zabalza, R. J. García López, E. Prandini, M. De Maria, A. De Angelis, M. Shayduk, M. I. Martínez, Ignasi Reichardt, Pratik Majumdar, M. V. Fonseca, M. Rissi, Nijil Mankuzhiyil, Agnieszka Sierpowska-Bartosik, Felix Spanier, Elina Lindfors, Saverio Lombardi, Daniel Ferenc, G. Maneva, N. Sidro, Daniel Mazin, H. Vankov, Ilana M. Braun, Jelena Ninkovic, M. López, Karl Mannheim, Francesco Longo, D. Pascoli, R. G. Pegna, Massimo Persic, D. Höhne-Mönch, W. Wittek, Francesco Dazzi, N. Puchades, Miguel A. Sánchez-Conde, D. Bose, Marc Ribó, S. Balestra, P. Antoranz, E. Leonardo, R. Mirzoyan, Stefano Covino, I. Britvitch, V. Curtef, M. T. Costado, Riccardo Paoletti, Robert Wagner, E. De Cea del Pozo, Diego F. Torres, M. Pasanen, Laura Maraschi, J. Zapatero, M. Meyer, Fabio Zandanel, D. Tescaro, J. M. Paredes, E. Carmona, L. O. Takalo, Antonio Stamerra, Florian Goebel, A. La Barbera, Hiroko Miyamoto, L. Font, M. Garczarczyk, Nicola Galante, R. Firpo, B. De Lotto, M. Tluczykont, F. De Sabata, Pol Bordas, Roberta Zanin, Thomas Bretz, S. N. Shore, J. Becerra González, Manel Errando, A. Laille, Wolfgang Rhode, P. Temnikov, R. de los Reyes, Daniel Nieto, Mario Meucci, Nicola Turini, Miguel A. Pérez-Torres, Giacomo Bonnoli, Masahiro Teshima, J. Rico, D. Hildebrand, L. Peruzzo, Julia Becker, S. Commichau, Wlodek Bednarek, D. Hadasch, Jose Miguel Miranda, T. Schweizer, Kari Nilsson, A. Herrero, R. K. Bock, Elisa Bernardini, T. Jogler, V. Scalzotto, Valentí Bosch-Ramon, V. Scapin, N. Otte, Masaaki Hayashida, Jose Luis Contreras, Juan Cortina, Javier Moldon, C. Delgado Mendez, E. Lorenz, L. A. Antonelli, Igor Oya, Fabrizio Tavecchio, Daniel Kranich, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, I., Britvitch, M., Camara, E., Carmona, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. d., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, C. C., Hsu, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, N., Otte, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Cúmuls de galàxies, Astrophysics::High Energy Astrophysical Phenomena, Population, MILLISECOND PULSARS, SYSTEMS, HESS, Astrophysics, 01 natural sciences, Raigs gamma, Pulsar, Millisecond pulsar, Observacions astronòmiques, 0103 physical sciences, MAGIC (telescope), education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, education.field_of_study, Clusters of galaxies, 010308 nuclear & particles physics, Gamma rays, Astronomy, Astronomy and Astrophysics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Globular Clusters, Fermion, Astrophysics - Astrophysics of Galaxies, Star cluster, Space and Planetary Science, Globular cluster, Electrónica, Física nuclear, High Energy Physics::Experiment, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Lepton, Astronomical observations
Abstract: Based on MAGIC observations from June and July 2007, we have obtained an integral upper limit to the VHE energy emission of the globular cluster M13 of $F(E>200 \textrm{GeV})140 \textrm{GeV}$. Those limits allow us to constrain the population of millisecond pulsars within M13 and to test models for acceleration of leptons inside their magnetospheres and surrounding. We conclude that in M13 either millisecond pulsars are fewer than expected or they accelerate leptons less efficiently than predicted.
Published: 2009

80. PERIODIC VERY HIGH ENERGY gamma-RAY EMISSION FROM LS I+61 degrees 303 OBSERVED WITH THE MAGIC TELESCOPE

Author: Albert, J., Aliu, E., Anderhub, H., Antonelli, L. A., Antoranz, P., Backes, M., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J. K., Bednarek, W., Berger, K., Bernardini, E., Bigongiari, C., Biland, A., Bock, R. K., Bonnoli, G., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Covino, S., Curtef, V., Dazzi, F., Angelis, A. D., del Pozo, E. D., los Reyes, R. d., Lotto, B. D., Maria, M. D., Sabata, F. D., Mendez, C. D., Dominguez, A., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Fonseca, M. V., Font, L., Galante, N., Lopez, R. J. G., Garczarczyk, M., Gaug, M., Goebel, F., Hayashida, M., Herrero, A., Hohne, D., Hose, J., Hsu, C. C., Huber, S., Jogler, T., Kranich, D., Barbera, A. L., Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, Francesco, Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martinez, M., Mazin, D., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Otte, N., Oya, I., Panniello, M., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R. G., Perez Torres, M. A., Persic, M., Peruzzo, L., Piccioli, A., Prada, F., Prandini, E., Puchades, N., Raymers, A., Rhode, W., Ribo, M., Rico, J., Rissi, M., Robert, A., Rugamer, S., Saggion, A., Saito, T. Y., Salvati, M., Sanchez Conde, M., Sartori, P., Satalecka, K., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sierpowska Bartosik, A., Sillanpaa, A., Sobczynska, D., Spanier, F., Stamerra, A., Stark, L. S., Takalo, L., Tavecchio, F., Temnikov, P., Tescaro, D., Teshima, M., Tluczykont, M., Torres, D. F., Turini, N., Vankov, H., Venturini, A., Vitale, V., Wagner, R. M., Wittek, W., Zabalza, V., Zandanel, F., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, C., Bigongiari, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. d., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, M., Hayashida, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, N., Otte, I., Oya, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, A., Piccioli, F., Prada, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, P., Sartori, K., Satalecka, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Very High Energy Gamma-ray Astronomy, MAGIC telescope, Gamma-ray Binaries, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR
Abstract: The MAGIC collaboration has recently reported the discovery of gamma-ray emission from the binary system LS I +61 degrees 303 in the TeV energy region. Here we present new observational results on this source in the energy range between 300 GeV and 3 TeV. In total, 112 hr of data were taken between 2006 September and December covering four orbital cycles of this object. This large amount of data allowed us to produce an integral flux light curve covering for the first time all orbital phases of LS I +61 degrees 303. In addition, we also obtained a differential energy spectrum for two orbital phase bins covering the phase range 0.5 < phi < 0.6 and 0.6 < phi < 0.7. The photon index in the two phase bins is consistent within the errors with an average index Gamma = 2.6 +/- 0.2(stat) +/- 0.2(sys). LS I +61 degrees 303 was found to be variable at TeV energies on timescales of days. These new MAGIC measurements allowed us to search for intranight variability of the very high energy emission; however, no evidence for flux variability on timescales down to 30 min was found. To test for possible periodic structures in the light curve, we apply the formalism developed by Lomb and Scargle to the LS I +61 degrees 303 data taken in 2005 and 2006. We found the LS I +61 degrees 303 data set to be periodic with a period of (26.8 +/- 0.2) days (with a post-trial chance probability of 10(-7)), close to the orbital period.
Published: 2009

81. Radio imaging of the very-high-energy gamma-ray emission region in the central engine of a radio galaxy

Author: Veritas, Collaboration, Monitoring Team, Vlba Ghz M., Collaboration, H. E. S. S., Magic, Collaboration, Acciari, V. A., Aliu, E., Arlen, T., Bautista, M., Beilicke, M., Benbow, W., Bradbury, S. M., Buckley, J. H., Bugaev, V., Butt, Y., Byrum, K., Cannon, A., Celik, O., Cesarini, A., Chow, Y. C., Ciupik, L., Cogan, P., Cui, W., Dickherber, R., Fegan, S. J., Finley, J. P., Fortin, P., Fortson, L., Furniss, A., Gall, D., Gillanders, G. H., Grube, J., Guenette, R., Gyuk, G., Hanna, D., Holder, J., Horan, D., Hui, C. M., Humensky, T. B., Imran, A., Kaaret, P., Karlsson, N., Kieda, D., Kildea, J., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., Lebohec, S., Maier, G., Mccann, A., Mccutcheon, M., Millis, J., Moriarty, P., Ong, R. A., Otte, A. N., Pandel, D., Perkins, J. S., Petry, D., Pohl, M., Quinn, J., Ragan, K., Reyes, L. C., Reynolds, P. T., Roache, E., Rose, H. J., Schroedter, M., Sembroski, G. H., Smith, A. W., Swordy, S. P., Theiling, M., Toner, J. A., Varlotta, A., Vincent, S., Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A., Williams, D. A., Wissel, S., Wood, M., Walker, R. C., Davies, F., Hardee, P. E., Junor, W., Ly, C., Aharonian, F., Akhperjanian, A. G., Anton, G., Barres Almeida, U., Bazer-Bachi, A. R., Becherini, Y., Behera, B., Bernlohr, K., Bochow, A., Boisson, C., Bolmont, J., Borrel, V., Brucker, J., Brun, F., Brun, P., Buhler, R., Bulik, T., Busching, I., Boutelier, T., Chadwick, P. M., Charbonnier, A., Chaves, R. C. G., Cheesebrough, A., Chounet, L-M, Clapson, A. C., Coignet, G., Dalton, M., Daniel, M. K., Davids, I. D., Degrange, B., Deil, C., Dickinson, H. J., Djannati-Atai, A., Domainko, W., Drury, L. O. C., Dubois, F., Dubus, G., Dyks, J., Dyrda, M., Egberts, K., Emmanoulopoulos, D., Espigat, P., Farnier, C., Feinstein, F., Fiasson, A., Forster, A., Fontaine, G., Fussling, M., Gabici, S., Gallant, Y. A., Gerard, L., Gerbig, D., Giebels, B., Glicenstein, J. F., Gluck, B., Goret, P., Gohring, D., Hauser, D., Hauser, M., Heinz, S., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J. A., Hoffmann, A., Hofmann, W., Holleran, M., Hoppe, S., Horns, D., Jacholkowska, A., Jager, O. C., Jahn, C., Jung, I., Katarzynski, K., Katz, U., Kaufmann, S., Kendziorra, E., Kerschhaggl, M., Khangulyan, D., Khelifi, B., Keogh, D., Kluzniak, W., Kneiske, T., Komin, Nu, Kosack, K., Lamanna, G., Lenain, J-P, Lohse, T., Marandon, V., Martin, J. M., Martineau-Huynh, O., Marcowith, A., Maurin, D., Mccomb, T. J. L., Medina, M. C., Moderski, R., Moulin, E., Naumann-Godo, M., Naurois, M., Nedbal, D., Nekrassov, D., Nicholas, B., Niemiec, J., Nolan, S. J., Ohm, S., Olive, J-F, Ona Wilhelmi, E., Orford, K. J., Ostrowski, M., Panter, M., Paz Arribas, M., Pedaletti, G., Pelletier, G., Petrucci, P-O, Pita, S., Puhlhofer, G., Punch, M., Quirrenbach, A., Raubenheimer, B. C., Raue, M., Rayner, S. M., Renaud, M., Rieger, F., Ripken, J., Rob, L., Rosier-Lees, S., Rowell, G., Rudak, B., Rulten, C. B., Ruppel, J., Sahakian, V., Santangelo, A., Schlickeiser, R., Schock, F. M., Schroder, R., Schwanke, U., Schwarzburg, S., Schwemmer, S., Shalchi, A., Sikora, M., Skilton, J. L., Sol, H., Spangler, D., Stawarz, L., Steenkamp, R., Stegmann, C., Stinzing, F., Superina, G., Szostek, A., Tam, P. H., Tavernet, J-P, Terrier, R., Tibolla, O., Tluczykont, M., Christopher van Eldik, Vasileiadis, G., Venter, C., Venter, L., Vialle, J. P., Vincent, P., Vivier, M., Volk, H. J., Volpe, F., Wagner, S. J., Ward, M., Zdziarski, A. A., Zech, A., Anderhub, H., Antonelli, L. A., Antoranz, P., Backes, M., Baixeras, C., Balestra, S., Barrio, J. A., Bastieri, D., Becerra Gonzalez, J., Becker, J. K., Bednarek, W., Berger, K., Bernardini, E., Biland, A., Bock, R. K., Bonnoli, G., Bordas, P., Borla Tridon, D., Bosch-Ramon, V., Bose, D., Braun, I., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Covino, S., Curtef, V., Dazzi, F., Angelis, A., Cea Del Pozo, E., Delgado Mendez, C., Los Reyes, R., Lotto, B., Maria, M., Sabata, F., Dominguez, A., Dorner, D., Doro, M., Elsaesser, D., Errando, M., Ferenc, D., Fernandez, E., Firpo, R., Fonseca, M. V., Font, L., Galante, N., Garcia Lopez, R. J., Garczarczyk, M., Gaug, M., Goebel, F., Hadasch, D., Hayashida, M., Herrero, A., Hildebrand, D., Hohne-Monch, D., Hose, J., Hsu, C. C., Jogler, T., Kranich, D., La Barbera, A., Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, F., Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martinez, M., Mazin, D., Meucci, M., Miranda, J. M., Mirzoyan, R., Miyamoto, H., Moldon, J., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Oya, I., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R. G., Perez-Torres, M. A., Persic, M., Peruzzo, L., Prada, F., Prandini, E., Puchades, N., Reichardt, I., Rhode, W., Ribo, M., Rico, J., Rissi, M., Robert, A., Rugamer, S., Saggion, A., Saito, T. Y., Salvati, M., Sanchez-Conde, M., Satalecka, K., Scalzotto, V., Scapin, V., Schweizer, T., Shayduk, M., Shore, S. N., Sidro, N., Sierpowska-Bartosik, A., Sillanpaa, A., Sitarek, J., Sobczynska, D., Spanier, F., Stamerra, A., Stark, L. S., Takalo, L., Tavecchio, F., Temnikov, P., Tescaro, D., Teshima, M., Torres, D. F., Turini, N., Vankov, H., Wagner, R. M., Zabalza, V., Zandanel, F., Zanin, R., Zapatero, J., Centre d'étude spatiale des rayonnements (CESR), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Astrophysique de Grenoble (LAOG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), APC - Astrophysique des Hautes Energies (APC - AHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), HESS, Universitat de Barcelona, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Dipartimento di Astronomia, Universita degli Studi di Bologna, Università di Bologna [Bologna] (UNIBO)-Università di Bologna [Bologna] (UNIBO)-AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), V. A., Acciari, E., Aliu, T., Arlen, M., Bautista, M., Beilicke, W., Benbow, S. M., Bradbury, J. H., Buckley, V., Bugaev, Y., Butt, K., Byrum, A., Cannon, O., Celik, A., Cesarini, Y. C., Chow, L., Ciupik, P., Cogan, W., Cui, R., Dickherber, S. J., Fegan, J. P., Finley, P., Fortin, L., Fortson, A., Furni, D., Gall, G. H., Gillander, J., Grube, R., Guenette, G., Gyuk, D., Hanna, J., Holder, D., Horan, C. M., Hui, T. B., Humensky, A., Imran, P., Kaaret, N., Karlsson, D., Kieda, J., Kildea, A., Konopelko, H., Krawczynski, F., Krennrich, M. J., Lang, S., Lebohec, G., Maier, A., Mccann, M., Mccutcheon, J., Milli, P., Moriarty, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, D., Petry, M., Pohl, J., Quinn, K., Ragan, L. C., Reye, P. T., Reynold, E., Roache, H. J., Rose, M., Schroedter, G. H., Sembroski, A. W., Smith, S. P., Swordy, M., Theiling, J. A., Toner, A., Varlotta, S., Vincent, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, D. A., William, S., Wissel, M., Wood, R. C., Walker, F., Davie, P. E., Hardee, W., Junor, C., Ly, F., Aharonian, A. G., Akhperjanian, G., Anton, U. B., de Almeida, A. R., Bazer Bachi, Y., Becherini, B., Behera, K., Bernlohr, A., Bochow, C., Boisson, J., Bolmont, V., Borrel, J., Brucker, F., Brun, P., Brun, R., Buhler, T., Bulik, I., Busching, T., Boutelier, P. M., Chadwick, A., Charbonnier, R. C. G., Chave, A., Cheesebrough, L. M., Chounet, A. C., Clapson, G., Coignet, M., Dalton, M. K., Daniel, I. D., David, B., Degrange, C., Deil, H. J., Dickinson, A., Djannati Atai, W., Domainko, L. O., Drury, F., Duboi, G., Dubu, J., Dyk, M., Dyrda, K., Egbert, D., Emmanoulopoulo, P., Espigat, C., Farnier, F., Feinstein, A., Fiasson, A., Forster, G., Fontaine, M., Fussling, S., Gabici, Y. A., Gallant, L., Gerard, D., Gerbig, B., Giebel, J. F., Glicenstein, B., Gluck, P., Goret, D., Gohring, D., Hauser, M., Hauser, S., Heinz, G., Heinzelmann, G., Henri, G., Hermann, J. A., Hinton, A., Hoffmann, W., Hofmann, M., Holleran, S., Hoppe, D., Horn, A., Jacholkowska, O. C., de Jager, C., Jahn, I., Jung, K., Katarzynski, U., Katz, S., Kaufmann, E., Kendziorra, M., Kerschhaggl, D., Khangulyan, B., Khelifi, D., Keogh, W., Kluzniak, T., Kneiske, N., Komin, K., Kosack, G., Lamanna, J. P., Lenain, T., Lohse, V., Marandon, J. M., Martin, O., Martineau Huynh, A., Marcowith, D., Maurin, T. J. L., Mccomb, M. C., Medina, R., Moderski, E., Moulin, M., Naumann Godo, M. d., Nauroi, D., Nedbal, D., Nekrassov, B., Nichola, J., Niemiec, S. J., Nolan, S., Ohm, J. F., Olive, E. D., Wilhelmi, K. J., Orford, M., Ostrowski, M., Panter, M. P., Arriba, G., Pedaletti, G., Pelletier, P. O., Petrucci, S., Pita, M., Raue, S. M., Rayner, M., Renaud, F., Rieger, J., Ripken, L., Rob, S., Rosier Lee, G., Rowell, B., Rudak, C. B., Rulten, J., Ruppel, V., Sahakian, A., Santangelo, R., Schlickeiser, F. M., Schock, R., Schroder, U., Schwanke, S., Schwarzburg, S., Schwemmer, A., Shalchi, M., Sikora, J. L., Skilton, H., Sol, D., Spangler, L., Stawarz, R., Steenkamp, C., Stegmann, F., Stinzing, G., Superina, A., Szostek, P. H., Tam, J. P., Tavernet, R., Terrier, O., Tibolla, M., Tluczykont, C. v., Eldik, G., Vasileiadi, C., Venter, L., Venter, J. P., Vialle, P., Vincent, M., Vivier, H. J., Volk, F., Volpe, S. J., Wagner, M., Ward, A. A., Zdziarski, A., Zech, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzlez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, I., Britvitch, M., Camara, E., Carmona, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., Del Pozo, C. D., Mendez, R. D., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernndez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, C. C., Hsu, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, V., Zabalza, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: m87 jet, Radio galaxy, Astrophysics, telescope, 01 natural sciences, Astroparticle, Jets (Astrofísica), Radio astronomy, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, tev emission, Multidisciplinary, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Gamma ray, 3. Good health, Forats negres (Astronomia), Radioastronomia, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Galaxies, Radio wave, outburst, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Active galactic nucleus, inner jet, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, X-shaped radio galaxy, veritas, 0103 physical sciences, Nucli galàctic actiu, crab-nebula, VHE Gamma ray, Astrophysics::Galaxy Astrophysics, Active galactic nuclei, variability, 010308 nuclear & particles physics, nucleus, Astronomy, Astrophysics - Astrophysics of Galaxies, Galaxy, Accretion (astrophysics), Astrophysical jets, Black hole, Cherenkov telescope, Astrophysics of Galaxies (astro-ph.GA), Black holes (Astronomy), supermassive black-hole
Abstract: The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10^12 electron Volts (eV) and are bright sources of very-high-energy (VHE) gamma-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy M87, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole., Comment: 21 pages, 5 figures, published in Science, see: http://www.sciencemag.org/cgi/content/abstract/325/5939/444
Published: 2009

82. Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007

Author: Aaron Dominguez, Giacomo Bonnoli, Felicitas Pauss, Dorota Sobczyńska, Abelardo Moralejo, Elsa De Cea DelPozo, M. Tluczykont, A. Saggion, Adrian Biland, Mario Meucci, Michael Backes, Elisa Prandini, Thomas Schweizer, T. Jogler, Markus Gaug, M. Meyer, Victor Zabalza, Maria Victoria Fonseca, Hristofor Vankov, Elina Lindfors, Antonio Stamerra, Carlos Delgado Mendez, Antonio La Barbera, Konstancja Satalecka, Daniel Mazin, Kari Nilsson, Michele Doro, Daniela Ferenc, Tomoka Tosaki, Hiroko Miyamoto, R. G. Pegna, Marc Ribó, Mariano Moles, Ma Teresa Costado Dios, Louis Antonelli, R. Firpo, Agnieszka Sierpowska-Bartosik, Debanjan Bose, A. Laille, L. Peruzzo, Silvia Balestra, M. Rissi, Yuichi Yaji, Ilia Britvitch, R. J. García-López, Ignasi Reichardt, Enrique Fernández, Alessandro DeAngelis, C. C. Hsu, Francesco Longo, W. Wittek, Masaaki Hayashida, Nicola Galante, Naoki Isobe, Stefano Covino, N. Otte, Jordi Zapatero, Jose Luis Contreras, Mahito Sasada, Dominik Elsaesser, Valentin Curtef, Luisa Sabrina Stark Schneebeli, G. Maneva, Juan Cortina, Javier Rico, Massimo Persic, Donatella López, Artemio Herrero, A. Robert, Francisco Prada, Hiromi Seta, Igor Oya, Makoto Uemura, H. Anderhub, Lluis Font, R. Mirzoyan, D. Tescaro, Nicola Turini, Fabrizio Tavecchio, Riccardo Paoletti, Denis Bastieri, Roberta Zanin, Laura Maraschi, Daniel Kranich, Daniel Nieto, K. Berger, Josep M. Paredes, Takayuki Y. Saito, Raquel DelosReyes, Yoshito Shimajiri, Michela DeMaria, M. I. Martínez, Fabio Zandanel, V. Scalzotto, Karl Mannheim, Nuria Sidro, E. Carmona, Wodzimierz Bednarek, D. Pascoli, S. Rügamer, Juan Abel Barrio, Valentí Bosch-Ramon, Felix Spanier, R. K. Bock, Miguel A. Pérez-Torres, Josefa González, Markus Garczarczyk, Makoto Tashiro, Leo O. Takalo, C. Baixeras, Javier Moldon, Akira Arai, V. Scapin, Neus Puchades, Elvira Leonardo, Daniela Borla Tridon, Julian Sitarek, J. Hose, Pol Bordas, Dorothee Hildebrand, P. Antoranz, Isabel Braun, P. Majumdar, Julia Becker, S. Commichau, Jelena Ninkovic, Diego F. Torres, M. Pasanen, Daniela Dorner, Daniel Höhne-Mönch, Daniela Hadasch, Robert Wagner, Francesco Dazzi, Jose Miguel Miranda, Miguel A. Sánchez-Conde, Mosè Mariotti, Barbara DeLotto, Saverio Lombardi, Masayuki Fukuhara, Manel Errando, M. Shayduk, Nijil Mankuzhiyil, Kotaro Kohno, Masahiro Teshima, M. Salvati, Thomas Bretz, Miguel Camara, A. Sillanpää, S. N. Shore, Kouichiro Nakanishi, Wolfgang Rhode, Francesco DeSabata, Florian Goebel, E. Lorenz, Petar Temnikov, Elisa Bernardini, Universitat de Barcelona, H., Seta, N., Isobe, M. S., Tashiro, Y., Yaji, A., Arai, M., Fukuhara, K., Kohno, K., Nakanishi, M., Sasada, Y., Shimajiri, T., Tosaki, M., Uemura, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, D., Bose, I., Braun, T., Bretz, I., Britvitch, M., Camara, E., Carmona, S., Commichau, J. L., Contrera, J., Cortina, M. T. C., Dio, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. d., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hildebrand, D., Hohne Monch, J., Hose, C. C., Hsu, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, D., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, H., Miyamoto, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, N., Otte, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, I., Reichardt, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S. S., Schneebeli, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Photon, Radiation mechanisms: non-thermal, OJ-287, Synchrotron radiation, Astrophysics, 01 natural sciences, Spectral line, law.invention, law, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Lorentz factor, Forats negres (Astronomia), ALL-SKY SURVEY, symbols, Spectral energy distribution, Galaxies: BL lacertae objects: individual (OJ 287), BLACK-HOLE MODEL, Raigs X, Astrophysics - High Energy Astrophysical Phenomena, Galaxies: BL lacertae objects: general, Astrophysics - Cosmology and Nongalactic Astrophysics, BOARD SUZAKU, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Active galactic nucleus, TELESCOPE, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Telescope, symbols.namesake, 0103 physical sciences, X-rays, Blazar, 010308 nuclear & particles physics, BL-LACERTAE OBJECTS, GAMMA-RAY EMISSION, BLAZARS, SYSTEM, PERFORMANCE, Astronomy and Astrophysics, Galaxies, Galàxies, X-rays: galaxies, Space and Planetary Science, Black holes (Astronomy)
Abstract: Suzaku observations of the blazar OJ 287 were performed in 2007 April 10--13 and November 7--9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra can be well described with single power-law models in both exposures. The derived X-ray photon index and the flux density at 1 keV were found to be Gamma = 1.65 +- 0.02 and S_{1 keV} = 215 +- 5 nJy, in the quiescent state. In the flaring state, the source exhibited a harder X-ray spectrum (Gamma = 1.50 +- 0.01) with a nearly doubled X-ray flux density S_{1 keV} = 404^{+6}_{-5} nJy. Moreover, significant hard X-ray signals were detected up to ~ 27 keV. In cooperation with the Suzaku, simultaneous radio, optical, and very-high-energy gamma-ray observations were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The radio and optical fluxes in the flaring state (3.04 +- 0.46 Jy and 8.93 +- 0.05 mJy at 86.75 Hz and in the V-band, respectively) were found to be higher by a factor of 2--3 than those in the quiescent state (1.73 +- 0.26 Jy and 3.03 +- 0.01 mJy at 86.75 Hz and in the V-band, respectively). No notable gamma-ray events were detected in either observation. The spectral energy distribution indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while synchrotron radiation exhibited a spectral cutoff around the optical frequency. Furthermore, no significant difference in the synchrotron cutoff frequency was found between the quiescent and flaring states. According to a simple synchrotron self-Compton model, the change of the spectral energy distribution is due to an increase in the energy density of electrons with small changes of both the magnetic field strength and the maximum Lorentz factor of electrons., 22 pages, 8 figures; accepted for publication in PASJ
Published: 2009

83. First bounds on the high-energy emission from isolated Wolf-Rayet binary systems

Author: Aliu, E., Anderhub, H., Antonelli, L.A., Antoranz, P., Backes, M., Baixeras, C., Barrio, J.A., Bartko, H., Bastieri, D., K. Becker, J., Bednarek, W., Berger, K., Bernardini, E., Bigongiari, C., Biland, A., K. Bock, R., Bonnoli, G., Bordas, P., Bosch-Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Commichau, S., L. Contreras, J., Cortina, J., T. Costado, M., Covino, S., Curtef, V., Dazzi, F., De Angelis, A., De Ceadel Pozo, E., De Los Reyes, R., De Lotto, B., De Maria, M., De Sabata, F., Delgado Mendez, C., Dominguez, A., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., V. Fonseca, M., Font, L., Galante, N., J. García López, R., Garczarczyk, M., Gaug, M., Goebel, F., Hayashida, M., Herrero, A., Höhne, D., Hose, J., C. Hsu, C., Huber, S., Jogler, T., M. Kneiske, T., Kranich, D., La Barbera, A., Laille, A., Leonardo, E., Lindfors, E., Lombardi, S., Longo, F., López, M., Lorenz, E., Majumdar, P., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., Meyer, M., M. Miranda, J., Mirzoyan, R., Mizobuchi, S., Moles, M., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., De Oña Wilhelmi, E., Otte, N., Oya, I., Panniello, M., Paoletti, R., M. Paredes, J., Pasanen, M., Pascoli, D., Pauss, F., G. Pegna, R., A. Perez-Torres, M., Persic, M., Peruzzo, L., Piccioli, A., Prada, F., Prandini, E., Puchades, N., Raymers, A., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Y. Saito, T., Salvati, M., Sanchez-Conde, M., Sartori, P., Satalecka, K., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., N. Shore, S., Sidro, N., Sierpowska-Bartosik, A., Sillanpää, A., Sobczynska, D., Spanier, F., Stamerra, A., S. Stark, L., Takalo, L., Tavecchio, F., Temnikov, P., Tescaro, D., Teshima, M., Tluczykont, M., F. Torres, D., Turini, N., Vankov, H., Venturini, A., Vitale, V., M. Wagner, R., Wittek, W., Zabalza, V., Zandanel, F., Zanin, R., Zapatero, J., APC - Astrophysique des Hautes Energies (APC - AHE), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Universitat de Barcelona, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Dipartimento di Astronomia, Universita degli Studi di Bologna, Università di Bologna [Bologna] (UNIBO)-Università di Bologna [Bologna] (UNIBO), E., Aliu, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, C., Bigongiari, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., del Pozo, R. D., Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, M., Hayashida, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, A., Piccioli, F., Prada, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, P., Sartori, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: High energy, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], High velocity, Astrophysics::High Energy Astrophysical Phenomena, Binary number, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Star (graph theory), 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Wolf–Rayet star, Raigs gamma, Observacions astronòmiques, 0103 physical sciences, Binary star, Astrophysics::Solar and Stellar Astrophysics, WR star binarie, 010303 astronomy & astrophysics, Cosmic rays, Astrophysics::Galaxy Astrophysics, WR star binaries, Physics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, 010308 nuclear & particles physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics (astro-ph), Gamma rays, Astronomy and Astrophysics, gamma rays, observations, Space and Planetary Science, High mass, ddc:520, Electrónica, Física nuclear, Electricidad, gamma rays: observations, Astronomical observations
Abstract: High-energy gamma-ray emission is theoretically expected to arise in tight binary star systems (with high mass loss and high velocity winds), although the evidence of this relationship has proven to be elusive so far. Here we present the first bounds on this putative emission from isolated Wolf-Rayet (WR) star binaries, WR 147 and WR 146, obtained from observations with the MAGIC telescope., (Authors are the MAGIC Collaboration.) Manuscript in press at The Astrophysical Journal Letters
Published: 2008

84. Observation of pulsed gamma-rays above 25 GeV from the Crab pulsar with MAGIC

Author: A. Saggion, Adrian Biland, Manel Errando, Giacomo Bonnoli, Mariano Moles, P. Temnikov, Fabio Zandanel, J. Rico, K. Berger, V. Curtef, L. O. Takalo, J. K. Becker, M. Shayduk, Aaron Dominguez, Mosè Mariotti, A. Herrero, Felicitas Pauss, Konstancja Satalecka, J. A. Barrio, Miriam Lucio Martinez, P. Bordas, Michele Doro, Alessio Venturini, L. S. Stark, Kari Nilsson, Igor Oya, Fabrizio Tavecchio, Jelena Ninkovic, Saverio Lombardi, H. Anderhub, Daniel Kranich, Victor Zabalza, Abelardo Moralejo, J. M. Paredes, Daniel Ferenc, Michael Backes, R. K. Bock, Francesco Dazzi, Antonio Stamerra, Masahiro Teshima, D. Pascoli, Miguel A. Sánchez-Conde, C. Delgado Mendez, H. Vankov, I. Britvitch, E. Leonardo, R. Paoletti, T. Schweizer, Felix Spanier, Denis Bastieri, C. Baixeras, A. Robert, H. Bartko, Dominik Elsässer, A. Raymers, E. Fernandez, A. Sillanpää, Robert Wagner, R. Firpo, M. S. Meyer, Daniela Dorner, Takashi Saito, L. A. Antonelli, A. Laille, V. Scalzotto, M. Salvati, D. Mazin, A. Piccioli, Nicola Galante, J. Hose, M. Gaug, W. Wittek, Daniela Hadasch, P. Sartori, O. C. de Jager, N. Mankuzhiyil, Karl Mannheim, E. Lorenz, Florian Goebel, M. Tluczykont, Elisa Bernardini, R. de los Reyes, Nicola Turini, V. Scapin, Valentí Bosch-Ramon, Francisco Prada, S. Commichau, Jose Luis Contreras, Wlodek Bednarek, Daniel Nieto, C. C. Hsu, Juan Cortina, T. Jogler, D. Höhne, P. Antoranz, Mario Meucci, M. De Maria, Jose Miguel Miranda, L. Peruzzo, M. A. Lopez, Diego F. Torres, Ciro Bigongiari, A. La Barbera, M. Pasanen, M. Garczarczyk, N. Sidro, B. De Lotto, A. De Angelis, Dorota Sobczyńska, E. Prandini, G. Maneva, K. Shinozaki, E. de Oña Wilhelmi, Roberta Zanin, E. De Cea del Pozo, V. Vitale, R. Mirzoyan, Lluis Font, E. Carmona, Thomas Bretz, Wolfgang Rhode, Michela Fagiolini, Stefano Covino, Ashot Chilingarian, N. Puchades, N. Otte, R. J. García López, Agnieszka Sierpowska-Bartosik, J. Zapatero, M. Camara, F. De Sabata, D. Tescaro, Massimo Persic, L. Maraschi, E. Aliu, Elina Lindfors, F. Longo, R. G. Pegna, Pratik Majumdar, M. V. Fonseca, M. Rissi, M. Hayashida, S. N. Shore, Marc Ribó, M. T. Costado, Miguel A. Pérez-Torres, S. Rügamer, S. Huber, E., Aliu, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, C., Bigongiari, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D. C., del Pozo, R. d., los Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsasser, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, Longo, Francesco, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, N., Otte, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, A., Piccioli, F., Prada, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, P., Sartori, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, O. C., de Jager, E. D., Wilhelmi, and Universitat de Barcelona
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Phase (waves), FOS: Physical sciences, Magnetosphere, Astrophysics, Electromagnetisme, Space telescopes, 01 natural sciences, law.invention, Magnetosfera, Telescope, Electromagnetism, Pulsar, Very High Energy Gamma-ray Astronomy, MAGIC telescope, law, Gamma ray astronomy, 0103 physical sciences, Astronomia de raigs gamma, Cutoff, MAGIC (telescope), VHE gamma rays from Crab, 010303 astronomy & astrophysics, Pulsars, Cherenkov radiation, Physics, Multidisciplinary, gamma-ray Imaging Cherenkov telescopes, Synchrotron radiation, 010308 nuclear & particles physics, Crab Pulsar, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Radiació sincrotrònica, MAGIC, Púlsars, Electrónica, Física nuclear, Electricidad, Telescopis espacials
Abstract: One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 GeV. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 GeV, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario., Comment: Slight modification of the analysis: Fitting a more general function to the combined data set of COMPTEL, EGRET and MAGIC. Final result and conclusion is unchanged
Published: 2008

85. First bounds on the very high energy γ-ray emission from Arp 220

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bock, R. K., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., Angelis, A. D., Los, R. D., Lotto, B. D., Domingo Santamaria, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Hohne, D., Hose, J., Hsu, C. C., Jacon, P., Jogler, T., Kalekin, O., Kosyra, R., Kranich, D., Kritzer, R., Laille, A., Liebing, P., Lindfors, E., Lombardi, S., Longo, F., Lopez, J., Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martinez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., Ona Wilhelmi, E., Otte, N., Oya, I., Paneque, D., Paoletti, Riccardo, Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Puchades, N., Prandini, E., Raymers, A., Rhode, W., Ribo, M., Rico, J., Rissi, M., Robert, A., Rugamer, S., Saggion, A., Sanchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpaa, A., Sobczynska, D., Stamerra, Antonio, Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, R. D., Los Reye, B. D., Lotto, E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., Hohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, O., Kalekin, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, N., Puchade, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, J., Zapatero, and Universitat de Barcelona
Subjects: ULTRALUMINOUS INFRARED GALAXIES, High energy, Infrared, IMAGES, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Galaxie, STAR-FORMATION, law.invention, Telescope, Raigs gamma, law, HESS, MAGIC (telescope), Cherenkov radiation, Astrophysics::Galaxy Astrophysics, Physics, Astrophysics (astro-ph), Gamma rays, Gamma ray, MAGIC TELESCOPE, REGIONS, EGRET, Astronomy and Astrophysics, Galaxies, Galaxy, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, Electrónica, Física nuclear, Electricidad
Abstract: Using the Major Atmospheric Gamma Imaging Cherenkov Telescope (MAGIC), we have observed the nearest ultra-luminous infrared galaxy Arp 220 for about 15 hours. No significant signal was detected within the dedicated amount of observation time. The first upper limits to the very high energy $\gamma$-ray flux of Arp 220 are herein reported and compared with theoretical expectations., Comment: Accepted for publication in ApJ
Published: 2007

86. Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in low emission state with the magic telescope

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, D., Becker, J. K., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bock, R. K., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Curtef, V., Danielyan, V., Dazzi, F., Angelis, A. D., Delgado, C., Reyes, R. D. L., Lotto, B. D., Domingo Santamaria, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Angelis, D., Ferenc, D., Fernandez, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garcia Lopez, R., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Herrero, A., Hohne, D., Hose, J., Hsu, C. C., Jacon, P., Jogler, T., Kalekin, O., Kosyra, R., Kranich, D., Kritzer, R., Laille, A., Liebing, P., Lindfors, E., Lombardi, S., Longo, Francesco, Lopez, J., Lopez, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martinez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Ninkovic, J., Onna Wilhelmi, E., Otte, N., Oya, I., Paneque, D., Panniello, M., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Prandini, E., Puchades, N., Raymers, A., Rhode, W., Ribo, M., Rico, J., Rissi, M., Robert, A., Rugamer, S., Saggion, A., Sanchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpaa, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zandanel, F., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, C., Delgado, R. D. L., Reye, B. D., Lotto, E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Angeli, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, R., Garcia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, O., Kalekin, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., Onna Wilhelmi, N., Otte, I., Oya, D., Paneque, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: ACTIVE GALACTIC NUCLEI, High energy, Photon, Astrophysics::High Energy Astrophysical Phenomena, UNIVERSE, Flux, FOS: Physical sciences, Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, 01 natural sciences, Power law, law.invention, law, 0103 physical sciences, SPECTRA, MAGIC (telescope), 010303 astronomy & astrophysics, MULTIWAVELENGTH OBSERVATIONS, Physics, 010308 nuclear & particles physics, CHERENKOV TELESCOPES, Astrophysics (astro-ph), Gamma ray, HEGRA, EINSTEIN SLEW SURVEY, Astronomy and Astrophysics, Active Galactic Nuclei, BL-LACERTAE OBJECTS, MAGIC telescope, LAC OBJECTS, DISCOVERY, RADIATION, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, Electrónica, Física nuclear, High Energy Physics::Experiment, Electricidad, Flare
Abstract: The MAGIC collaboration has observed very high energy gamma ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux of (2.38+-0.30(stat)+-0.70(syst))*10^-11 cm^-2 s^-1 above 200 GeV has been obtained from 23.1 hours of data taking between 2005 August 3 and 2006 January 1. The data confirm the previously detected gamma-ray emission from this object during a flare seen by the Whipple collaboration in 1995 and the evidence (below 5 sigma significance level) from long-term observations conducted by the Whipple and HEGRA groups. The MAGIC observations show a relatively steep differential photon spectrum that can be described by a power law with a photon index of alpha=-2.95+-0.12(stat)+-0.2(syst) between 140 GeV and 5.4 TeV. The observations reveal a low flux state, about six times below the 1995 flare seen by Whipple and comparable with the previous Whipple and HEGRA long term measurements. During the MAGIC observations no significant time variability has been observed., Comment: 7 pages, 7 figures, ApJ in press; updated fig. 4, fig. 7, tab. 3, removed typo in differential spectra
Published: 2007

87. Detection of very high energy radiation from the BL lacertae object PG 1553+113 with the MAGIC telescope

Author: Michela Fagiolini, Oriana Mansutti, Thomas Bretz, V. Scapin, V. Danielyan, T. Hengstebeck, Manel Errando, J. Zapatero, D. Tescaro, Wolfgang Rhode, N. Otte, Felicitas Pauss, Mario Meucci, Francesco Longo, W. Wittek, P. Jacon, M. Camara, H. Anderhub, Daniel Ferenc, C. Merck, Daniela Dorner, E. Aliu, M. V. Fonseca, M. Rissi, Riccardo Paoletti, Elina Lindfors, P. Sartori, H. Vankov, David Paneque, Mosè Mariotti, Denis Bastieri, Daniel Mazin, Masahiro Teshima, Dorota Sobczyńska, G. Maneva, C. C. Hsu, Maria Giller, Alvaro Sanchez, R. Schmitt, J. M. Paredes, Antonio Stamerra, R. G. Pegna, Justin Albert, A. Saggion, Karl Mannheim, L. Peruzzo, Tadeusz Wibig, Adrian Biland, Florian Goebel, Markus Gaug, Pol Bordas, R. Firpo, Saverio Lombardi, S. Rügamer, Juan Abel Barrio, C. Baixeras, E. Prandini, M. Garczarczyk, A. Armada, J. Rico, Stefano Ciprini, A. Robert, M. Poller, A. Sillanpää, Petar Temnikov, Julia Becker, K. Berger, S. Commichau, L. S. Stark, Wlodek Bednarek, R. Zanin, R. Mirzoyan, P. Antoranz, I. Britvitch, E. Oña-Wilhelmi, V. Curtef, M. A. Lopez, R. Kosyra, N. Puchades, Robert Wagner, J. Hose, K. Shinozaki, E. Carmona, P. Liebing, Masaaki Hayashida, M. Shayduk, V. Vitale, Jose Luis Contreras, D. Hakobyan, S. Mizobuchi, L. O. Takalo, Juan Cortina, Jose Miguel Miranda, E. Fernandez, A. Raymers, A. De Angelis, E. Domingo-Santamaría, N. Sidro, A. Laille, Marc Ribó, Valentí Bosch-Ramon, E. Lorenz, A. Piccioli, Ashot Chilingarian, O. Kalekin, D. Pascoli, Nicola Galante, T. Jogler, D. Höhne, P. Majumdar, R. de los Reyes, Nicola Turini, R. K. Bock, N. Tonello, Jorge Andres Lopez Lopez, T. Schweizer, Michele Doro, V. Scalzotto, Miriam Lucio Martinez, Igor Oya, Jose Flix, Daniel Kranich, Ll. Font, Kari Nilsson, Jelena Ninkovic, Francesco Dazzi, J. A. Coarasa, M. Fuchs, Massimo Persic, M. Meyer, Abelardo Moralejo, Diego F. Torres, Ciro Bigongiari, M. Pasanen, R. Kritzer, B. De Lotto, H. Bartko, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Raman, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, R. D. L., Reye, B. D., Lotto, E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., Hohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, O., Kalekin, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, N., Puchade, E., Prandini, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero
Subjects: Photon, Astrophysics::High Energy Astrophysical Phenomena, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Power law, Astronomical observatories, IMAGING CHERENKOV DETECTOR, gamma ray astronomy, Cosmic rays, Raigs gamma, Radiofrequency radiation, Physics, Gamma rays, Astronomy, Sigma, Astronomy and Astrophysics, Active Galactic Nuclei, Light curve, Redshift, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, BL Lacertae objects: individual (PG 1553+113), gamma rays: observations, Electrónica, Física nuclear, Electricidad, Observatoris astronòmics, BL Lac object
Abstract: In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553 + 113. The overall significance of the signal was 8.8 sigma for 18.8 hr of observation time. The light curve shows no significant flux variations on a daily timescale; the flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between similar to 90 and 500 GeV is well described by a power law with photon index. Gamma = 4.2 +/- 0.3. The combined 2005 and 2006 energy spectrum provides an upper limit of z = 0.74 on the redshift of the object.
Published: 2007

88. Constraints on the steady and pulsed very high energy gamma-ray emission from observations of PSR B1951+32/CTB 80 with the magic telescope

Author: Albert, J, Aliu, E, Anderhub, H, Antoranz, P, Armada, A, Baixeras, C, Barrio, Ja, Bartko, H, Bastieri, Denis, Becker, Jk, Bednarek, W, Berger, K, Bigongiari, C, Biland, A, Bock, Rk, Bordas, P, BOSCH RAMON, V, Bretz, T, Britvitch, I, Camara, M, Carmona, E, Chilingarian, A, Coarasa, Ja, Commichau, S, Contreras, Jl, Cortina, J, Costado, Mt, Curtef, V, Danielyan, V, Dazzi, Francesco, DE ANGELIS, A, Delgado, C, Reyes, Rdl, DE LOTTO, B, DOMINGO SANTAMARIA, E, Dorner, D, Doro, Michele, Errando, M, Fagiolini, M, Ferenc, D, Fernandez, E, Firpo, R, Flix, J, Fonseca, Mv, Font, L, Fuchs, M, Galante, N, GARCIA LOPEZ, R, Garczarczyk, M, Gaug, M, Giller, M, Goebel, F, Hakobyan, D, Hayashida, M, Hengstebeck, T, Herrero, A, Hirotani, K, Hne, Dhr, Hose, J, Hsu, Cc, Jacon, P, Jogler, T, Kosyra, R, Kranich, D, Kritzer, R, Laille, A, Lindfors, E, Lombardi, S, Longo, F, Lopez, J, Lopez, M, Lorenz, E, Majumdar, P, Maneva, G, Mannheim, K, Mansutti, O, Mariotti, Mose', Martinez, M, Mazin, D, Merck, C, Meucci, M, Meyer, M, Miranda, Jm, Mirzoyan, R, Mizobuchi, S, Moralejo, A, Nieto, D, Nilsson, K, Ninkovic, J, ONA WILHELMI, E, Otte, N, Oya, I, Paneque, D, Panniello, M, Paoletti, R, Paredes, Jm, Pasanen, M, Pascoli, Donatella, Pauss, F, Pegna, R, Persic, M, Peruzzo, Luigi, Piccioli, A, Poller, M, Prandini, E, Puchades, N, Raymers, A, Rhode, W, Ribo, M, Rico, J, Rissi, M, Robert, A, Gamer, Srr, Saggion, Antonio, Sanchez, A, Sartori, Paolo, Scalzotto, VILLI MARIO, Scapin, V, Schmitt, R, Schweizer, T, Shayduk, M, Shinozaki, K, Shore, Sn, Sidro, N, Sillanpaa, A, Sobczynska, D, Stamerra, A, Stark, Ls, Takalo, L, Temnikov, P, Tescaro, D, Teshima, M, Tonello, N, Torres, Df, Turini, N, Vankov, H, Vitale, V, Wagner, Rm, Wibig, T, Wittek, W, Zandanel, F, Zanin, R, Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, C., Delgado, R. D. L., Reye, B. D., Lotto, E., Domingo Santamaria, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, R., Garcia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, K., Hirotani, D. H. R., Hne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, D., Paneque, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S. R. R., Gamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: SUPERNOVA REMNANT CTB-80, CTB80, Very High Energy Gamma-ray Astronomy, Pulsar, Pulsar Wind Nebulae, MAGIC telescope, PSR B1951+32, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, RAPIDLY SPINNING PULSARS, CRAB-NEBULA, GAPS, MAGNETOSPHERES, RADIATION, WIND NEBULAE, VELA-X
Abstract: We report on very high energy gamma-ray observations with the MAGIC Telescope of the pulsar PSR B1951+32 and its associated nebula, CTB 80. Our data constrain the cutoff energy of the pulsar to be less than 32 GeV, assuming the pulsed gamma-ray emission to be exponentially cut off. In the case that the cutoff follows a superexponential behavior, the cutoff energy can be as high as similar to 60 GeV. The upper limit on the flux of pulsed gamma-ray emission above 75 GeV is 4.3; 10(-11) photons cm(-2) s(-1), and the upper limit on the flux of steady emission above 140 GeV is 1.5; 10(-11) photons cm(-2) s(-1). We discuss our results in the framework of recent model predictions and other studies.
Published: 2007

89. Very high energy gamma-ray radiation from the stellar mass black hole binary Cygnus X-1

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Baixeras, C., Barrio, J. A., Bartko, H., Bastieri, Denis, Becker, J. K., Bednarek, W., Berger, K., Bigongiari, Ciro, Biland, A., Bock, R. K., Bordas, P., Bosch Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Costado, M. T., Curtef, V., Danielyan, V., Dazzi, Francesco, De Angelis, A., Delgado, C., de los Reyes, R., De Lotto, B., Domingo Santamaría, E., Dorner, D., Doro, Michele, Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., García López, R. J., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Herrero, A., Höhne, D., Hose, J., Hsu, C. C., Jacon, P., Jogler, T., Kosyra, R., Kranich, D., Kritzer, R., Laille, A., Lindfors, E., Lombardi, Saverio, Longo, F., López, J., López, M., Lorenz, E., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, Mose', Martínez, M., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nieto, D., Nilsson, K., Ninkovic, J., Oña Wilhelmi, E., Otte, N., Oya, I., Panniello, M., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, Donatella, Pauss, F., Pegna, R., Persic, M., Peruzzo, Luigi, Piccioli, A., Prandini, Elisa, Puchades, N., Raymers, A., Rhode, W., Ribó, M., Rico, J., Rissi, M., Robert, A., Rügamer, S., Saggion, Antonio, Saito, T., Sánchez, A., Sartori, Paolo, Scalzotto, VILLI MARIO, Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zandanel, F., Zanin, R., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, J. K., Becker, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, V., Curtef, V., Danielyan, F., Dazzi, A. D., Angeli, C., Delgado, R., Reye, B. D., Lotto, E., Domingo SantamariA, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, R. J., Garcia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., Hohne, J., Hose, C. C., Hsu, P., Jacon, T., Jogler, R., Kosyra, D., Kranich, R., Kritzer, A., Laille, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Martinez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., Ona Wilhelmi, N., Otte, I., Oya, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T., Saito, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanpaa, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Black Holes, Stellar mass, Flux, FOS: Physical sciences, Astrophysics, law.invention, X-ray astronomy, law, Gamma ray astronomy, Astronomia de raigs gamma, Physics, Nebula, Acceleradors de partícules, Astrophysics (astro-ph), Gamma ray, Sigma, Astronomy and Astrophysics, Black Hole, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Particle accelerators, Astronomia de raigs X, Black hole, Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Electricidad, Flare
Abstract: We report on the results from the observations in very high energy band (VHE, E_gamma > 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC telescope, for a total of 40 hours during 26 nights, spanning the period between June and November 2006. Searches for steady gamma-ray signals yielded no positive result and upper limits to the integral flux ranging between 1 and 2% of the Crab nebula flux, depending on the energy, have been established. We also analyzed each observation night independently, obtaining evidence of gamma-ray signals at the 4.0 standard deviations (sigma) significance level (3.2 sigma after trial correction) for 154 minutes effective on-time (EOT) on September 24 between 20h58 and 23h41 UTC, coinciding with an X-ray flare seen by RXTE, Swift and INTEGRAL. A search for faster-varying signals within a night resulted in an excess with a significance of 4.9 sigma (4.1 sigma after trial correction) for 79 minutes EOT between 22h17 and 23h41 UTC. The measured excess is compatible with a point-like source at the position of Cygnus X-1, and excludes the nearby radio nebula powered by its relativistic jet. The differential energy spectrum is well fitted by an unbroken power-law described by dN/(dA dt dE) = (2.3+- 0.6) x 10^{-12} (E/1 TeV)^{-3.2 +- 0.6}. This is the first experimental evidence of VHE emission from a stellar-mass black hole, and therefore from a confirmed accreting X-ray binary., 4 ApJL-formatted pages, 4 figures. Revised version accepted for publication at ApJL (26-06-2007)
Published: 2007

90. Observation of gamma rays from the galactic center with the MAGIC telescope

Author: Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, D., Bavikadi, R., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bretz, T., Britvitch, I., Camara, M., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commichau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., de los Reyes, R., De Lotto, B., Domingo Santamaría, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernández, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Jacon, P., Kalekin, O., Kranich, D., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Longo, F., López, J., López, M., Lorenz, E., Lucarelli, F., Majumdar, P., Maneva, G., Mannheim, K., Mariotti, M., Martínez, M., Mase, K., Mazin, D., Merck, M., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Oña Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Pasanen, M., Pascoli, D., Pauss, F., Pavel, N., Pegna, R., Peruzzo, L., Piccioli, A., Prandini, E., Rico, J., Rhode, W., Riegel, B., Rissi, M., Robert, A., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, Antonio, Stepanian, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, Nicola, Vankov, H., Vardanyan, A., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, P., Jacon, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, M., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, E., Prandini, J., Rico, W., Rhode, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, A., Stepanian, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, A., Vardanyan, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero
Subjects: Astrofísica, High energy, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Power law, Spectral line, Acceleration of Particles, Galaxy: Center, Gamma Rays: Observations, MAGIC (telescope), Physics, Center [Galaxy], Observations [Gamma Rays], Galactic Center, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Space and Planetary Science, Acceleration of Particle, Electrónica, Física nuclear, Electricidad, Energy (signal processing)
Abstract: Recently, the Galactic Center has been reported to be a source of very high energy (VHE) gamma-rays by the VERITAS, CANGAROO and HESS experiments. The energy spectra as measured by these experiments show substantial differences. In this Letter we present MAGIC observations of the Galactic Center, resulting in the detection of a differential gamma-ray flux consistent with a steady, hard-slope power law, described as dN/(dA dt dE) = (2.9+/-0.6)*10^{-12} (E/TeV)^{-2.2+/-0.2} cm^{-2}s^{-1}TeV^{-1}. The gamma-ray source is centered at (Ra, Dec)=(17h 45m 20s, -29deg 2'. This result confirms the previous measurements by the HESS experiment and indicates a steady source of TeV gamma-rays. We briefly describe the observational technique used, the procedure implemented for the data analysis, and discuss the results in the perspective of different models proposed for the acceleration of the VHE gamma-rays., ApJL submitted
Published: 2006

91. Observation of VHE Gamma Radiation from HESS J1834-087/W41 with the MAGIC Telescope

Author: Albert, J, Aliu, E, Anderhub, H, Antoranz, P, Armada, A, Asensio, M, Baixeras, C, Barrio, Ja, Bartelt, M, Bartko, H, Bastieri, D, Bavikadi, Sr, Bednarek, W, Berger, K, Bigongiari, C, Biland, A, Bisesi, E, Bock, Rk, Bordas, P, Bosch Ramon, V, Bretz, T, Britvitch, I, Camara, M, Carmona, E, Chilingarian, A, Ciprini, S, Coarasa, Ja, Commichau, S, Contreras, Jl, Cortina, J, Curtef, V, Dame, Tm, Danielyan, V, Dazzi, F, DE ANGELIS, Alessandro, Reyes, Rdl, DE LOTTO, Barbara, Domingo Santamari, E, Dorner, D, Doro, M, Errando, M, Fagiolini, M, Ferenc, D, Fernandez, E, Firpo, R, Flix, J, Fonseca, Mv, Font, L, Fuchs, M, Galante, N, Garczarczyk, M, Gaug, M, Giller, M, Goebel, F, Hakobyan, D, Hayashida, M, Hengstebeck, T, Hohne, D, Hose, J, Hsu, Cc, Isar, Pg, Jacon, P, Kalekin, O, Kasyra, R, Kranich, D, Laatiaoui, M, Laille, A, Lenisa, T, Liebing, P, Lindfors, E, Lombardi, S, Longo, F, Lopez, J, Lopez, M, Lorenz, E, Lucarelli, F, Majumdar, P, Maneva, G, Mannheim, K, Mansutti, O, Mariotti, M, Martinez, M, Mase, K, Mazin, D, Merck, C, Meucci, M, Meyer, M, Miranda, Jm, Mirzoyan, R, Mizobuchi, S, Moralejo, A, Nilsson, K, Ona Wilhelmi, E, Orduna, R, Otte, N, Oya, I, Paneque, D, Paoletti, R, Paredes, Jm, Pasanen, M, Pascoli, D, Pauss, F, Pavel, N, Pegna, R, Persic, M, Peruzzo, L, Piccioli, A, Poller, M, Prandini, E, Raymers, A, Rico, J, Rhode, W, Ribo, M, Riegel, B, Rissi, M, Robert, A, Rugamer, S, Saggion, A, Sanchez, A, Sartori, P, Scalzotto, V, Scapin, V, Schmitt, R, Schweizer, T, Shayduk, M, Shinozaki, K, Shore, Sn, Sidro, N, Sillanpaa, A, Sobczynska, D, Stamerra, A, Stark, Ls, Takalo, L, Temnikov, P, Tescaro, D, Teshima, M, Tonello, N, Torres, A, Torres, Df, Turini, N, Vankov, H, Vitale, V, Wagner, Rm, Wibig, T, Wittek, W, Zanin, R, Zapatero, J., J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartelt, H., Bartko, D., Bastieri, S. R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, R. K., Bock, P., Borda, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtef, T. M., Dame, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\i, D., Dorner, M., Doro, M., Errando, M., Fagiolini, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, M., Fuch, N., Galante, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, D., H\ohne, J., Hose, C. C., Hsu, P. G., Isar, P., Jacon, O., Kalekin, R., Kasyra, D., Kranich, M., Laatiaoui, A., Laille, T., Lenisa, P., Liebing, E., Lindfor, S., Lombardi, Longo, Francesco, J., Lopez, M., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, O., Mansutti, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, K., Nilsson, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, I., Oya, D., Paneque, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, A., Raymer, J., Rico, W., Rhode, M., Ribo, B., Riegel, M., Rissi, A., Robert, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, V., Scapin, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L. S., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, R., Zanin, and J., Zapatero
Subjects: ISM: cosmic rays, Observation [Gamma Rays], Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Gamma Rays: Observations, ISM: Supernova Remnants, Astrophysics, Radiation, Power law, Supernova Remnants [ISM], Superposition principle, Raigs gamma, Coincident, MAGIC (telescope), Astrophysics::Galaxy Astrophysics, supernova remnants, Physics, Molecular cloud, Gamma rays, Astrophysics (astro-ph), observations [gamma rays], Astronomy and Astrophysics, Galactic plane, Space and Planetary Science, Electrónica, Física nuclear, Electricidad
Abstract: Recently, the HESS array has reported the detection of gamma-ray emission above a few hundred GeV from eight new sources located close to the Galactic Plane. The source HESS J1834-087 is spatially coincident with SNR G23.3-0.3 (W41). Here we present MAGIC observations of this source, resulting in the detection of a differential gamma-ray flux consistent with a power law, described as dN/(dA dt dE) = (3.7 +/- 0.6)*10^(-12) (E/TeV)^(-2.5 +/- 0.2) \ cm^(-2)s^(-1)TeV^(-1). We confirm the extended character of this flux. We briefly discuss the observational technique used, the procedure implemented for the data analysis, and put this detection in the perspective of the molecular environment found in the region of W41. We present 13CO and 12CO emission maps showing the existence of a massive molecular cloud in spatial superposition with the MAGIC detection., Comment: Accepted by ApJ Letters
Published: 2006
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92. Radio imaging of the very-high-energy gamma-ray emission region in the central engine of a radio galaxy.

Author: Acciari VA, Aliu E, Arlen T, Bautista M, Beilicke M, Benbow W, Bradbury SM, Buckley JH, Bugaev V, Butt Y, Byrum K, Cannon A, Celik O, Cesarini A, Chow YC, Ciupik L, Cogan P, Cui W, Dickherber R, Fegan SJ, Finley JP, Fortin P, Fortson L, Furniss A, Gall D, Gillanders GH, Grube J, Guenette R, Gyuk G, Hanna D, Holder J, Horan D, Hui CM, Humensky TB, Imran A, Kaaret P, Karlsson N, Kieda D, Kildea J, Konopelko A, Krawczynski H, Krennrich F, Lang MJ, LeBohec S, Maier G, McCann A, McCutcheon M, Millis J, Moriarty P, Ong RA, Otte AN, Pandel D, Perkins JS, Petry D, Pohl M, Quinn J, Ragan K, Reyes LC, Reynolds PT, Roache E, Roache E, Rose HJ, Schroedter M, Sembroski GH, Smith AW, Swordy SP, Theiling M, Toner JA, Varlotta A, Vincent S, Wakely SP, Ward JE, Weekes TC, Weinstein A, Williams DA, Wissel S, Wood M, Walker RC, Davies F, Hardee PE, Junor W, Ly C, Aharonian F, Akhperjanian AG, Anton G, Barres de Almeida U, Bazer-Bachi AR, Becherini Y, Behera B, Bernlöhr K, Bochow A, Boisson C, Bolmont J, Borrel V, Brucker J, Brun F, Brun P, Bühler R, Bulik T, Büsching I, Boutelier T, Chadwick PM, Charbonnier A, Chaves RC, Cheesebrough A, Chounet LM, Clapson AC, Coignet G, Dalton M, Daniel MK, Davids ID, Degrange B, Deil C, Dickinson HJ, Djannati-Ataï A, Domainko W, Drury LO, Dubois F, Dubus G, Dyks J, Dyrda M, Egberts K, Emmanoulopoulos D, Espigat P, Farnier C, Feinstein F, Fiasson A, Förster A, Fontaine G, Füssling M, Gabici S, Gallant YA, Gérard L, Gerbig D, Giebels B, Glicenstein JF, Glück B, Goret P, Göhring D, Hauser D, Hauser M, Heinz S, Heinzelmann G, Henri G, Hermann G, Hinton JA, Hoffmann A, Hofmann W, Holleran M, Hoppe S, Horns D, Jacholkowska A, de Jager OC, Jahn C, Jung I, Katarzyński K, Katz U, Kaufmann S, Kendziorra E, Kerschhaggl M, Khangulyan D, Khélifi B, Keogh D, Kluźniak W, Kneiske T, Komin N, Kosack K, Lamanna G, Lenain JP, Lohse T, Marandon V, Martin JM, Martineau-Huynh O, Marcowith A, Maurin D, McComb TJ, Medina MC, Moderski R, Moulin E, Naumann-Godo M, de Naurois M, Nedbal D, Nekrassov D, Nicholas B, Niemiec J, Nolan SJ, Ohm S, Olive JF, de Oña Wilhelmi E, Orford KJ, Ostrowski M, Panter M, Paz Arribas M, Pedaletti G, Pelletier G, Petrucci PO, Pita S, Pühlhofer G, Punch M, Quirrenbach A, Raubenheimer BC, Raue M, Rayner SM, Renaud M, Rieger F, Ripken J, Rob L, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Ruppel J, Sahakian V, Santangelo A, Schlickeiser R, Schöck FM, Schröder R, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Sikora M, Skilton JL, Sol H, Spangler D, Stawarz Ł, Steenkamp R, Stegmann C, Stinzing F, Superina G, Szostek A, Tam PH, Tavernet JP, Terrier R, Tibolla O, Tluczykont M, van Eldik C, Vasileiadis G, Venter C, Venter L, Vialle JP, Vincent P, Vivier M, Völk HJ, Volpe F, Wagner SJ, Ward M, Zdziarski AA, Zech A, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Balestra S, Barrio JA, Bastieri D, Becerra González J, Becker JK, Bednarek W, Berger K, Bernardini E, Biland A, Bock RK, Bonnoli G, Bordas P, Borla Tridon D, Bosch-Ramon V, Bose D, Braun I, Bretz T, Britvitch I, Camara M, Carmona E, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea del Pozo E, Delgado Mendez C, De los Reyes R, De Lotto B, De Maria M, De Sabata F, Dominguez A, Dorner D, Doro M, Elsaesser D, Errando M, Ferenc D, Fernández E, Firpo R, Fonseca MV, Font L, Galante N, García López RJ, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Hildebrand D, Höhne-Mönch D, Hose J, Hsu CC, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, López M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Miyamoto H, Moldón J, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Oya I, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Prada F, Prandini E, Puchades N, Reichardt I, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shore SN, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sitarek J, Sobczynska D, Spanier F, Stamerra A, Stark LS, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Torres DF, Turini N, Vankov H, Wagner RM, Zabalza V, Zandanel F, Zanin R, and Zapatero J
Abstract: The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10(12) electron volts and are bright sources of very-high-energy (VHE) gamma-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy Messier 87, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.
Published: 2009
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93. Observation of pulsed gamma-rays above 25 GeV from the Crab pulsar with MAGIC.

Author: Aliu E, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Barrio JA, Bartko H, Bastieri D, Becker JK, Bednarek W, Berger K, Bernardini E, Bigongiari C, Biland A, Bock RK, Bonnoli G, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea Del Pozo E, de Los Reyes R, De Lotto B, De Maria M, De Sabata F, Delgado Mendez C, Dominguez A, Dorner D, Doro M, Elsässer D, Errando M, Fagiolini M, Ferenc D, Fernandez E, Firpo R, Fonseca MV, Font L, Galante N, Garcia Lopez RJ, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne D, Hose J, Hsu CC, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, Lopez M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martinez M, Mazin D, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Otte N, Oya I, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Piccioli A, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sobczynska D, Spanier F, Stamerra A, Stark LS, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres DF, Turini N, Vankov H, Venturini A, Vitale V, Wagner RM, Wittek W, Zabalza V, Zandanel F, Zanin R, Zapatero J, de Jager OC, and de Ona Wilhelmi E
Abstract: One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 giga-electron volts. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 giga-electron volts, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario.
Published: 2008
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94. Very-high-energy gamma rays from a distant quasar: how transparent is the universe?

Author: Albert J, Aliu E, Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Barrio JA, Bartko H, Bastieri D, Becker JK, Bednarek W, Berger K, Bernardini E, Bigongiari C, Biland A, Bock RK, Bonnoli G, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras JL, Cortina J, Costado MT, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea Del Pozo E, de Los Reyes R, De Lotto B, De Maria M, De Sabata F, Mendez CD, Dominguez A, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Fonseca MV, Font L, Galante N, López RJ, Garczarczyk M, Gaug M, Goebel F, Hayashida M, Herrero A, Höhne D, Hose J, Hsu CC, Huber S, Jogler T, Kneiske TM, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, López M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Otte N, Oya I, Panniello M, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo L, Piccioli A, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito TY, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sobczynska D, Spanier F, Stamerra A, Stark LS, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres DF, Turini N, Vankov H, Venturini A, Vitale V, Wagner RM, Wittek W, Zabalza V, Zandanel F, Zanin R, and Zapatero J
Abstract: The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.
Published: 2008
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95. Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303.

Author: Albert J, Aliu E, Anderhub H, Antoranz P, Armada A, Asensio M, Baixeras C, Barrio JA, Bartelt M, Bartko H, Bastieri D, Bavikadi SR, Bednarek W, Berger K, Bigongiari C, Biland A, Bisesi E, Bock RK, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Ciprini S, Coarasa JA, Commichau S, Contreras JL, Cortina J, Curtef V, Danielyan V, Dazzi F, De Angelis A, de Los Reyes R, De Lotto B, Domingo-Santamaría E, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Flix J, Fonseca MV, Font L, Fuchs M, Galante N, Garczarczyk M, Gaug M, Giller M, Goebel F, Hakobyan D, Hayashida M, Hengstebeck T, Höhne D, Hose J, Hsu CC, Isar PG, Jacon P, Kalekin O, Kosyra R, Kranich D, Laatiaoui M, Laille A, Lenisa T, Liebing P, Lindfors E, Lombardi S, Longo F, López J, López M, Lorenz E, Lucarelli F, Majumdar P, Maneva G, Mannheim K, Mansutti O, Mariotti M, Martínez M, Mase K, Mazin D, Merck C, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moralejo A, Nilsson K, Oña-Wilhelmi E, Orduña R, Otte N, Oya I, Paneque D, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pavel N, Pegna R, Persic M, Peruzzo L, Piccioli A, Poller M, Pooley G, Prandini E, Raymers A, Rhode W, Ribó M, Rico J, Riegel B, Rissi M, Robert A, Romero GE, Rügamer S, Saggion A, Sánchez A, Sartori P, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sillanpää A, Sobczynska D, Stamerra A, Stark LS, Takalo L, Temnikov P, Tescaro D, Teshima M, Tonello N, Torres A, Torres DF, Turini N, Vankov H, Vitale V, Wagner RM, Wibig T, Wittek W, Zanin R, and Zapatero J
Abstract: Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.
Published: 2006
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