Author: "D. Pascoli" - Searchworks@Jio Institute Digital Library Search Results

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1. 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

2. Unfolding of differential energy spectra in the MAGIC experiment

Author: E. Fernandez, M. I. Martínez, K. Shinozaki, V. Danielyan, R. K. Bock, N. Sidro, A. Laille, J. M. Paredes, Antonio Stamerra, Francesco Longo, W. Wittek, D. Pascoli, Roberta Zanin, M. Fuchs, Massimo Persic, F. Pauss, E. Lorenz, T. Hengstebeck, E. Domingo-Santamaría, Michela Fagiolini, Oriana Mansutti, M. Pasanen, Abelardo Moralejo, R. de los Reyes, Stefano Ciprini, D. Hakobyan, S. Mizobuchi, Denis Bastieri, A. Robert, Nicola Turini, Jelena Ninkovic, R. Firpo, Alvaro Sanchez, Marc Ribó, K. Nilsson, M. T. Costado, C. Baixeras, H. Anderhub, Julia Becker, Francesco Dazzi, S. Commichau, J. A. Coarasa, D. Tescaro, Tadeusz Wibig, Dorota Sobczyńska, P. Antoranz, J. Zapatero, Justin Albert, Jose Miguel Miranda, Juan Abel Barrio, V. Vitale, I. Oya, J. Rico, G. Maneva, A. Saggion, F. Zandanel, Daniel Nieto, Adrian Biland, Mario Meucci, E. Carmona, Markus Gaug, N. Otte, C. Merck, C. Delgado, K. Berger, L. Peruzzo, K. Mannheim, E. Aliu, Elina Lindfors, L. S. Stark, M. Meyer, Daniel Mazin, Riccardo Paoletti, Michele Doro, M. V. Fonseca, M. Garczarczyk, S. Rügamer, Elisa Prandini, V. Curtef, M. Camara, Ashot Chilingarian, Maria Giller, M. Shayduk, Diego F. Torres, Ciro Bigongiari, Manel Errando, L. O. Takalo, A. Raymers, Pol Bordas, A. Herrero, Mosè Mariotti, A. De Angelis, A. Piccioli, Nicola Galante, P. Sartori, Saverio Lombardi, R. Kritzer, M. Asensio, B. De Lotto, M. López, R. Schmitt, R. Kosyra, Robert Wagner, H. Bartko, E. Oña-Wilhelmi, N. Puchades, P. Jacon, C. C. Hsu, A. Armada, Thomas Bretz, S. N. Shore, R. Mirzoyan, M. Panniello, Masahiro Teshima, Wolfgang Rhode, T. Schweizer, I. Britvitch, A. Sillanpää, W. Bednarek, Jose Flix, Ll. Font, Takashi Saito, Daniela Dorner, J. Hose, Petar Temnikov, Valentí Bosch-Ramon, V. Scapin, Florian Goebel, Masaaki Hayashida, Jose Luis Contreras, Juan Cortina, R. Pegna, Daniel Ferenc, H. Vankov, P. Majumdar, Jorge Andres Lopez Lopez, V. Scalzotto, M. Rissi, D. Kranich, T. Jogler, D. Höhne, R. J. García-López, 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, Angelis, A., C., Delgado, 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, R. J., Garc\ia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., H\ohne, 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., Mart\inez, D., Mazin, C., Merck, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, S., Mizobuchi, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, E., O\~na 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., R\ugamer, 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., Sillanp\a\a, 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: Nuclear and High Energy Physics, statistics techniques, DISTRIBUTIONS, ENTROPY, regularization, unfolding, Very High Energy Gamma-ray Astronomy, Calibrations, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Spectral line, Nuclear physics, Software, gamma ray astronomy, Statistical analysis, Statistical physics, Instrumentation, Physics, Quantitative Biology::Biomolecules, business.industry, Astrophysics (astro-ph), Very high energy gamma ray astronomy, Electrónica, Física nuclear, Electricidad, business
Abstract: The paper describes the different methods, used in the MAGIC experiment, to unfold experimental energy distributions of cosmic ray particles (gamma-rays). Questions and problems related to the unfolding are discussed. Various procedures are proposed which can help to make the unfolding robust and reliable. The different methods and procedures are implemented in the MAGIC software and are used in most of the analyses., Comment: Submitted to NIM A
Published: 2007

3. Variable Very High Energy γ‐Ray Emission from Markarian 501

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch‐Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, B. De 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. Fuchs, 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, D. Hrupec, C. C. Hsu, P. Jacon, T. Jogler, R. Kosyra, D. Kranich, R. Kritzer, A. Laille, E. Lindfors, S. Lombardi, F. Longo, 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. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, E. Prandini, N. Puchades, A. Raymers, 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, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, F. Zandanel, R. Zanin, J. Zapatero, 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. J., Garcia Lopez, M., Garczarczyk, M., Gaug, M., Giller, F., Goebel, D., Hakobyan, M., Hayashida, T., Hengstebeck, A., Herrero, D., Hohne, J., Hose, D., Hrupec, 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, 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, F., Tavecchio, 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: PARTICLE-ACCELERATION, Photon, ACTIVE GALACTIC NUCLEI, BL-LAC OBJECTS, CHERENKOV TELESCOPE SYSTEM, LOG-PARABOLIC SPECTRA, 23 DAY PERIODICITY, BLACK-HOLE MODELS, X-RAY, MKN 501, MULTIWAVELENGTH OBSERVATIONS, Flux, Electron, Astrophysics, 01 natural sciences, Spectral line, Luminosity, law.invention, law, 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, Physics, 010308 nuclear & particles physics, Gamma ray, Active Galactic Nuclei, Astronomy and Astrophysics, MAGIC telescope, Very High Energy Gamma-ray Astronomy, Space and Planetary Science, Electrónica, Física nuclear, Electricidad, Markarian 501, BL Lac, AGN, VHE gamma-ray, imaging air Cherenkov telescope, MAGIC, Flare
Abstract: The blazar Markarian 501 (Mrk 501) was observed at energies above 0.10 TeV with the MAGIC telescope from May through July 2005. The high sensitivity of the instrument enabled the determination of the flux and spectrum of the source on a night-by-night basis. Throughout our observational campaign, the flux from Mrk 501 was found to vary by an order of magnitude. Intra-night flux variability with flux-doubling times down to 2 minutes was observed during the two most active nights, namely June 30 and July 9. These are the fastest flux variations ever observed in Mrk 501. The ~20-minute long flare of July 9 showed an indication of a 4 +/- 1 min time delay between the peaks of F(1.2 TeV), which may indicate a progressive acceleration of electrons in the emitting plasma blob. The flux variability was quantified for several energy ranges, and found to increase with the energy of the gamma-ray photons. The spectra hardened significantly with increasing flux, and during the two most active nights, a spectral peak was clearly detected at 0.43 +/- 0.06 TeV and 0.25 +/- 0.07 TeV, respectively for June 30 and July 9. There is no evidence of such spectral feature for the other nights at energies down to 0.10 TeV, thus suggesting that the spectral peak is correlated with the source luminosity. These observed characteristics could be accommodated in a Synchrotron-Self-Compton (SSC) framework in which the increase in gamma-ray flux is produced by a freshly injected (high energy) electron population.
Published: 2007

4. MAGIC Upper Limits on the Very High Energy Emission from Gamma‐Ray Bursts

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch‐Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, B. De 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. Fuchs, 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, T. Lenisa, P. Liebing, E. Lindfors, S. Lombardi, F. Longo, 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, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, M. Poller, E. Prandini, N. Puchades, A. Raymers, 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. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, R. Zanin, J. Zapatero, 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, 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., 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, 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., 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, 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, R., Zanin, and J., Zapatero
Subjects: High energy, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics::High Energy Astrophysical Phenomena, Very High Energy Gamma-ray Astronomy, Gamma-ray Bursts, MAGIC telescope, Extrapolation, FIREBALLS, Astrophysics, COMPTON EMISSION, Power law, GRB 050713A, Observacions astronòmiques, SEARCH, Gamma ray astronomy, Astronomia de raigs gamma, SPECTRA, MAGIC (telescope), LONG-DURATION, TEV EMISSION, AFTERGLOWS, SYNCHROTRON, COMPONENT, Zenith, Physics, Scattering, Attenuation, Astronomy and Astrophysics, Redshift, Space and Planetary Science, Gamma-ray Burst, Electrónica, Física nuclear, Electricidad, Astronomical observations
Abstract: During its first data cycle, between 2005 and the beginning of 2006, the fast repositioning system of the MAGIC telescope allowed the observation of nine different gamma-ray bursts as possible sources of very high energy gamma-rays. These observations were triggered by alerts from Swift, HETE-2, and INTEGRAL; they started as quickly as possible after the alerts and lasted for several minutes, with an energy threshold varying between 80 and 200 GeV, depending on the zenith angle of the burst. No evidence for gamma signals was found, and upper limits for the flux were derived for all events using the standard analysis chain of MAGIC. For the bursts with measured redshifts, the upper limits are compatible with a power-law extrapolation, when the intrinsic fluxes are evaluated taking into account the attenuation due to the scattering in the metagalactic radiation field.
Published: 2007

5. Constraints on the Steady and Pulsed Very High Energy Gamma‐Ray Emission from Observations of PSR B1951 \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $+$ \end{document} 32/CTB 80 with the MAGIC Telescope

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch‐Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, B. De 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. Fuchs, N. Galante, R. Garcia‐Lopez, M. Garczarczyk, M. Gaug, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, A. Herrero, K. Hirotani, D. Hohne, J. Hose, C.‐C. Hsu, P. Jacon, T. Jogler, R. Kosyra, D. Kranich, R. Kritzer, A. Laille, E. Lindfors, S. Lombardi, F. Longo, 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. Ninković, E. Ona‐Wilhelmi, N. Otte, I. Oya, D. Paneque, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, M. Poller, E. Prandini, N. Puchades, A. Raymers, 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. Sobczyńska, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, F. Zandanel, R. Zanin, and J. Zapatero
Subjects: Physics, High energy, Nebula, Photon, Pulsar, Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Cutoff, Flux, Astronomy and Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: We report on very high energy gamma-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. The upper limit on the flux of pulsed gamma-ray emission above 75 GeV is 4.3*10^-11 photons cm^-2 sec^-1, and the upper limit on the flux of steady emission above 140 GeV is 1.5*10^-11 photons cm^-2 sec^-1. We discuss our results in the framework of recent model predictions and other studies.
Published: 2007

6. Measurement of the μ decay spectrum with the ICARUS liquid Argon TPC

Author: J. Lagoda, L. Periale, S. Zhen, D.B. Chen, A. Martinez de la Ossa, S. Galli, Mario Terrani, M. Szeptycka, Xiaojing Huang, C. Matthey, A. Gigli Berzolari, Cezary Juszczak, F. Sergiampietri, R. Sulej, M. Bischofberger, Alessandro Menegolli, E. Rondio, F. Mauri, A. Guglielmi, B. Bekman, Alfredo G. Cocco, R. Brunetti, Massimo Rossella, A. Zalewska, G. Mannocchi, M. Campanelli, T. Kozłowski, J. Stepaniak, D. A. Scannicchio, A. Bueno, Z. Xu, Sandro Ventura, Riccardo Bruzzese, A. Ereditato, G. Meng, André Rubbia, M. Łaffranchi, M. Messina, Arnaud Ferrari, D. Pascoli, C. Osuna, Chao Zhang, S. Centro, F. Cavanna, Jan T. Sobczyk, Hui Wang, Salvatore Amoruso, P. Cennini, Marta Felcini, A. Badertscher, Krzysztof M. Graczyk, C. Vignoli, M. C. Prata, J. Woo, I. Gil-Botella, G. Piano Mortari, J. Holeczek, Xuan Wang, D. Chen, J. Rico, P. Benetti, D. Garcia-Gamez, K. He, J. Ma, Z. Li, Nicola Spinelli, Paola Sala, E. Calligarich, A. Melgarejo, M. Szarska, A. Rappoldi, F. Lu, Jan Kisiel, A. Di Cicco, W. Zipper, Youngho Seo, T. Rancati, G. Fiorillo, E. Segreto, W. Półchłopek, D. Gibin, O. Palamara, D. Cavalli, P. Aprili, S. Navas-Concha, A. Borio di Tigliole, F. Carbonara, G. Battistoni, S. Otwinowski, R. Dolfini, Raffaele Velotta, B. Baiboussinov, Chang Chen, Z. Dai, G.L. Raselli, K. Cieślik, Yi-Chun Chen, Silvia Muraro, A. D. Ferella, Y. Ge, Rosalía Cid, Q. Zhang, David B. Cline, F. Arneodo, C. Carpanese, Alessandra Cesana, G. Mangano, F. Ferri, Q. Ouyang, A. Piazzoli, P. Picchi, F. Pietropaolo, R. Santorelli, C. De Vecchi, M. Baldo Ceolin, J. A. Nowak, L. Grandi, M. Markiewicz, D. Kielczewska, A. Dabrowska, G. Xu, C. Montanari, M. Antonello, C. Rubbia, Amoruso, Salvatore, Antonello, M., Aprili, P., Arneodo, F., Badertscher, A., Baiboussinov, B., Ceolin, M. B., Battistoni, G., Bekman, B., Benetti, P., Bischofberger, M., A. B., Di, Brunetti, R., Bruzzese, Riccardo, Bueno, A., Calligarich, E., Campanelli, M., Carbonara, F., Carpanese, C., Cavalli, D., Cavanna, F., Cennini, P., Centro, S., Cesana, A., Chen, C., Chen, D., Chen, D. B., Chen, Y., Cid, R., Cieslik, K., Cline, D., Cocco, A. G., Dai, Z., Vecchi, C. D., Dabrowska, A., Cicco, A. D., Dolfini, R., Ereditato, A., Felcini, M., Ferella, A., Ferrari, A., Ferri, F., Fiorillo, Giuliana, Galli, S., Garcia Gamez, D., Ge, Y., Gibin, D., Berzolari, A. G., Gil Botella, I., Graczyk, K., Grandi, L., Guglielmi, A., He, K., Holeczek, J., Huang, X., Juszczak, C., Kielczewska, D., Kisiel, J., Kozlowski, T., Laffranchi, M., Lagoda, J., Li, Z., Lu, F., Ma, J., Mangano, G., Mannocchi, G., Markiewicz, M., A. M., De, Matthey, C., Mauri, F., Melgarejo, A., Menegolli, A., Meng, G., Messina, M., Montanari, C., Muraro, S., Navas Concha, S., Nowak, J., Osuna, C., Otwinowski, S., Ouyang, Q., Palamara, O., Pascoli, D., Periale, L., G. B. P., Piazzoli, A., Picchi, P., Pietropaolo, F., Polchlopek, W., Prata, M., Rancati, T., Rappoldi, A., Raselli, G. L., Rico, J., Rondio, E., Rossella, M., Rubbia, A., Rubbia, C., Sala, P., Santorelli, R., Scannicchio, D., Segreto, E., Seo, Y., Sergiampietri, F., Sobczyk, J., Spinelli, Nicola, Stepaniak, J., Sulej, R., Szarska, M., Szeptycka, M., Terrani, M., Velotta, Raffaele, Ventura, S., Vignoli, C., Wang, H., Wang, X., Woo, J., Xu, G., Xu, Z., Zalewska, A., Zhang, C., Zhang, Q., Zhen, S., and Zipper, W.
Subjects: ICARUS, Physics, Muon, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, FOS: Physical sciences, MICHEL PARAMETERS, Spectral line, High Energy Physics - Experiment, CAPTURE, MUONS, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle decay, Decay energy, Scintillation counter, LEPTON DECAYS, High Energy Physics::Experiment, Neutrino, TAU-NEUTRINO HELICITY, Nuclear Experiment, Engineering (miscellaneous), SPARK-CHAMBER SPECTROMETER, RADIATIVE CORRECTIONS, Lepton
Abstract: Examples are given which prove the ICARUS detector quality through relevant physics measurements. We study the μ decay energy spectrum from a sample of stopping μ events acquired during the test run of the ICARUS T600 detector. This detector allows the spatial reconstruction of the events with fine granularity, hence, the precise measurement of the range and dE/dx of the μ with high sampling rate. This information is used to compute the calibration factors needed for the full calorimetric reconstruction of the events. The Michel ρ parameter is then measured by comparison of the experimental and Monte Carlo simulated μ decay spectra, obtaining ρ=0.72±0.06(stat.)±0.08(syst.). The energy resolution for electrons below ∼50 MeV is finally extracted from the simulated sample, obtaining (Eemeas−EeMC)/EeMC=11%/E[MeV]−−−−−−−√⊕2%., The European Physical Journal C, 33 (2), ISSN:1434-6044, ISSN:1434-6052
Published: 2004

7. 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

8. Performance of the ICARUS liquid argon prototype

Author: M. Terrani, G. Battistoni, S. Otwinowski, A. Di Credico, P. Picchi, P. Cennini, Antonio Bueno, J. Ma, L. Periale, Paola Sala, Hui Wang, B. Romualdi, André Rubbia, M. Lisowski, E. Tatananni, Z. Xu, C. De Vecchi, E. Calligarich, S. Zhen, P. Benetti, C. Carpanese, A. Rappoldi, Arnaud Ferrari, F. Arneodo, J. Woo, K. He, David B. Cline, Z. Li, Q. Zhang, G. Piano Mortari, A. Kruse, A. A. Grillo, F. Lu, Mario Campanelli, S. Centro, Chao Zhang, Eugenio Scapparone, Elisa Bernardini, F. Cavanna, A. Haag, A. Badertscher, F. Ferri, O. Palamara, D. Cavalli, C. Vignoli, D. A. Scannicchio, C. Rubbia, A. Borio di Tigliole, D. Pascoli, F. Sergiampietri, L. Grandi, M. Laffranchi, M. Nicoletto, Xiaojing Huang, C. Matthey, I. Gil-Botella, Sandro Ventura, A. Rotilio, Chang Chen, Massimo Rossella, G.L. Raselli, Yi-Chun Chen, Silvia Muraro, D.B. Chen, E. Segreto, T. Rancati, F. Mauri, F. Pietropaolo, A. Cesana, S. Navas-Concha, R. Brunetti, R. Dolfini, G. Nurzia, B. Baiboussinov, A. Gigli Berzolari, G. Xu, C. Montanari, S. Petrera, N. Sinanis, M. Bischofberger, D. Mazza, G. Meng, J. Rico, Q. Ouyang, and A. Piazzoli
Subjects: Cryostat, ICARUS, Physics, Nuclear and High Energy Physics, Wire chamber, Time projection chamber, Argon, Nuclear engineering, Detector, chemistry.chemical_element, Cryogenics, Particle detector, Nuclear physics, chemistry, Instrumentation
Abstract: We report on the performance of a liquid Argon Time Projection Chamber, operating in a 10 m 3 cryostat. This device built in the framework of the ICARUS T600 programme to serve as a full test facility for the adopted cryogenics and mechanical solutions, was successfully tested in 2000 as the last step before the tests of the first 600 t ICARUS module 1 year later. In a final run at the Gran Sasso Laboratory, whose outcome provides the main subject of this paper, also the readout and imaging capabilities of the installed wire chamber and the overall performance of the detector have been successfully tested.
Published: 2003

9. 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

10. 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

11. 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

12. 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

13. DISCOVERY OF VERY HIGH ENERGY gamma-RAYS FROM THE BLAZAR S5 0716+714

Author: H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, A. Berdyugin, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, D. Bose, I. Braun, T. Bretz, D. Britzger, M. Camara, E. Carmona, A. Carosi, P. Colin, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, F. Dazzi, A. De Angelis, E. de Cea del Pozo, R. De los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, N. Godinovic, F. Goebel, D. Hadasch, A. Herrero, D. Hildebrand, D. Höhne-Mönch, J. Hose, D. Hrupec, C. C. Hsu, T. Jogler, S. Klepser, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, J. M. Miranda, R. Mirzoyan, H. Miyamoto, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, R. Orito, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, I. Puljak, I. Reichardt, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, J. Sainio, T. Y. Saito, M. Salvati, M. Sánchez-Conde, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, S. N. Shore, A. Sierpowska-Bartosik, A. Sillanpää, 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. Torres, N. Turini, H. Vankov, R. M. Wagner, C. Villforth, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, 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, 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, J., Sainio, 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, C., Villforth, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, and Universitat de Barcelona
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Telescope, Raigs gamma, law, Observacions astronòmiques, 0103 physical sciences, MAGIC (telescope), Blazar, Cosmic rays, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Active Galactic Nuclei, Gamma rays, Gamma ray, Astronomy and Astrophysics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Crab Nebula, Space and Planetary Science, BL Lacertae objects: individual: S5 0716+714, gamma rays: observations, Spectral energy distribution, ddc:520, High Energy Physics::Experiment, Electrónica, Física nuclear, Electricidad, Astrophysics - Cosmology and Nongalactic Astrophysics, Astronomical observations
Abstract: The MAGIC collaboration reports the detection of the blazar S5 0716+714 z=0.31+-0.08 in very high energy gamma-rays. The observations were performed in November 2007 and in April 2008, and were triggered by the KVA telescope due to the high optical state of the object. An overall significance of the signal accounts to S =5.8sigma for 13.1 hours of data. Most of the signal S = 6.9sigma comes from the April 2008 data sample during a higher optical state of the object suggesting a possible correlation between the VHE gamma-ray and optical emissions. The differential energy spectrum of the 2008 data sample follows a power law with a photon index of Gamma = 3.45+-0.54_(stat)+-0.2_(syst), and the integral flux above 400GeV is at the level of 7.5+-2.2_(stat)+-2.3_(syst)*10^-12 cm^-2 s^-1 corresponding to a 9% Crab Nebula flux. Modeling of the broad band spectral energy distribution indicates that a structured jet model appears to be more promising in describing the available data than a simple one zone synchrotron self-Compton model., accepted to ApJL
Published: 2009

14. 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

15. THE JUNE 2008 FLARE OF MARKARIAN 421 FROM OPTICAL TO TeV ENERGIES

Author: I. Donnarumma, V. Vittorini, S. Vercellone, E. Del Monte, M. Feroci, F. D'Ammando, L. Pacciani, A. W. Chen, M. Tavani, A. Bulgarelli, A. Giuliani, F. Longo, G. Pucella, A. Argan, G. Barbiellini, F. Boffelli, P. Caraveo, P. W. Cattaneo, V. Cocco, E. Costa, G. De Paris, G. Di Cocco, Y. Evangelista, M. Fiorini, T. Froysland, M. Frutti, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, I. Lapshov, F. Lazzarotto, P. Lipari, M. Marisaldi, M. Mastropietro, S. Mereghetti, E. Morelli, A. Morselli, A. Pellizzoni, F. Perotti, P. Picozza, G. Porrovecchio, M. Prest, M. Rapisarda, A. Rappoldi, A. Rubini, P. Soffitta, M. Trifoglio, A. Trois, E. Vallazza, A. Zambra, D. Zanello, C. Pittori, P. Santolamazza, F. Verrecchia, P. Giommi, S. Colafrancesco, L. Salotti, M. Villata, C. M. Raiteri, W. P. Chen, N. V. Efimova, B. Jordan, T. S. Konstantinova, E. Koptelova, O. M. Kurtanidze, V. M. Larionov, J. A. Ros, A. C. Sadun, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, H. Bartko, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hadasch, M. Hayashida, A. Herrero, D. Höhne-Mönch, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, 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. Sillanpää, 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. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, V. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. Byrum, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. K. Daniel, R. Dickherber, C. Duke, T. Ergin, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, A. Furniss, D. Gall, G. H. Gillanders, R. Guenette, G. Gyuk, J. Grube, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. Brian Humensky, A. Imran, 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, M. McCutcheon, A. Milovanovic, P. Moriarty, T. Nagai, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, A. Pichel, M. Pohl, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, M. Theiling, J. A. Toner, L. Valcarcel, A. Varlotta, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, D. A. Williams, S. Wissel, M. Wood, B. Zitzer, I., Donnarumma, V., Vittorini, S., Vercellone, E. D., Monte, M., Feroci, F., D'Ammando, L., Pacciani, A. W., Chen, M., Tavani, A., Bulgarelli, A., Giuliani, Longo, Francesco, G., Pucella, A., Argan, G., Barbiellini, F., Boffelli, P., Caraveo, P. W., Cattaneo, V., Cocco, E., Costa, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Fiorini, T., Froysland, M., Frutti, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Morelli, A., Morselli, A., Pellizzoni, F., Perotti, P., Picozza, G., Porrovecchio, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, C., Pittori, P., Santolamazza, F., Verrecchia, P., Giommi, S., Colafrancesco, L., Salotti, M., Villata, C. M., Raiteri, W. P., Chen, N. V., Efimova, B., Jordan, T. S., Konstantinova, E., Koptelova, O. M., Kurtanidze, V. M., Larionov, J. A., Ro, A. C., Sadun, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, H., Bartko, 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, 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, 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., Hohne Monch, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, 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, 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, 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, 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, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, V., Acciari, E., Aliu, T., Arlen, M., Beilicke, W., Benbow, S. M., Bradbury, J. H., Buckley, V., Bugaev, Y., Butt, K., Byrum, A., Cannon, A., Cesarini, Y. C., Chow, L., Ciupik, P., Cogan, P., Colin, W., Cui, M. K., Daniel, R., Dickherber, C., Duke, T., Ergin, S. J., Fegan, J. P., Finley, G., Finnegan, P., Fortin, A., Furni, D., Gall, G. H., Gillander, R., Guenette, G., Gyuk, J., Grube, D., Hanna, J., Holder, D., Horan, C. M., Hui, T. B., Humensky, A., Imran, 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, M., Mccutcheon, A., Milovanovic, P., Moriarty, T., Nagai, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, A., Pichel, M., Pohl, 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, L., Valcarcel, A., Varlotta, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, D. A., William, S., Wissel, M., Wood, B., Zitzer, Donnarumma I, Vittorini V, Vercellone S, del Monte E, Feroci M, DAmmando F, Pacciani L, Chen A W, Tavani M, Bulgarelli A, Giuliani A, Longo F, Pucella G, Argan A, Barbiellini G, Boffelli F, Caraveo P, Cattaneo P W, Cocco V, Costa E, DeParis G, Di Cocco G, Evangelista Y, Fiorini M, Froysland T, Frutti M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mastropietro M, Mereghetti S, Morelli E, Morselli A, Pellizzoni A, Perotti F, Picozza P, Porrovecchio G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zambra A, Zanello D, Pittori C, Santolamazza P, Verrecchia F, Giommi P, Colafrancesco S, Salotti L, Villata M, Raiteri C M, Chen W P, Efimova N V, Jordan B, Konstantinova T S, Koptelova E, Kurtanidze O M, Larionov V M, Ros J A, Sadun A C, Anderhub H, Antonelli L A, Antoranz P, Backes M, Baixeras C, Balestra S, Barrio J A, Bartko H, Bastieri D, González J Becerra, Becker J K, Bednarek W, Berger K, Bernardini E, Biland A, Bock R K, Bonnoli G, Bordas P, Tridon D Borla, 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, DeAngelis A, DeCea del Pozo E, de los Reyes R, DeLotto B, DeMaria M, DeSabata F, Mendez C Delgado, Dominguez A, Dorner D, Doro M, Elsaesser D, Errando M, Ferenc D, Fernández E, Firpo R, Fonseca M V, Font L, Galante N, García López R J, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne-Mönch D, Hose J, Hsu C C, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, 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 J M, Mirzoyan R, Moldón 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, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito T Y, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore S N, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sitarek J, 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, Acciari V, Aliu E, Arlen T, Beilicke M, Benbow W, Bradbury S M, Buckley J H, Bugaev V, Butt Y, Byrum K, Cannon A, Cesarini A, Chow Y C, Ciupik L, Cogan P, Colin P, Cui W, Daniel M K, Dickherber R, Duke C, Ergin T, Fegan S J, Finley J P, Finnegan G, Fortin P, Furniss A, Gall D, Gillanders G H, Guenette R, Gyuk G, Grube J, Hanna D, Holder J, Horan D, Hui C M, Humensky T Brian, Imran A, Kaaret P, Karlsson N, Kertzman M, Kieda D, Kildea J, Konopelko A, Krawczynski H, Krennrich F, Lang M J, LeBohec S, Maier G, McCann A, McCutcheon M, Milovanovic A, Moriarty P, Nagai T, Ong R A, Otte A N, Pandel D, Perkins J S, Pichel A, Pohl M, Ragan K, Reyes L C, Reynolds P T, Roache E, Rose H J, Schroedter M, Sembroski G H, Smith A W, Steele D, Swordy S P, Theiling M, Toner J A, Valcarcel L, Varlotta A, Wakely S P, Ward J E, Weekes T C, Weinstein A, Williams D A, Wissel S, Wood M, and Zitzer B
Subjects: campaign, Raigs còsmics, BL Lacertae: individual: Mrk421, galaxies: jets, X-Rays: Galaxies, gamma rays: observations, radiation mechanisms: nonthermal, bl-lacertae objects, blazars, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Gamma-ray Astronomy, law.invention, Raigs gamma, law, optical, MAGIC (telescope), Agile, blazr, X-ray, gamma, high energy observation, 010303 astronomy & astrophysics, webt, Physics, x-ray-spectra, Astrophysics (astro-ph), gamma-rays, lac objects, xmm-newton, Spectral energy distribution, Electrónica, Física nuclear, Raigs X, Electricidad, Flare, outburst, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 0103 physical sciences, X-rays, BL Lacertae objects: individual (Mrk 421) – gamma rays: observations – galaxies: jets – radiation mechanisms: non-thermal – X-rays: galaxies, Blazar, Cosmic rays, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Active Galactic Nuclei, radiation mechanisms: non-thermal, Light curve, Galaxies, Galàxies, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, ddc:520, AGILE satellite, bl lacertae objects: individual (mrk 421), Energy (signal processing), Lepton
Abstract: We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on June 9--15, with $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than the average flux observed by EGRET by a factor of $\sim$3, but still consistent with the highest EGRET flux. In hard X-rays (20-60 keV) SuperAGILE resolved a 5-day flare (June 9-15) peaking at $\sim$ 55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior are also detected in the simultaneous optical data provided by the GASP-WEBT. A Swift/XRT observation near the flaring maximum revealed the highest 2-10 keV flux ever observed from this source, of 2.6 $\times 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (i.e. > 100 mCrab). A peak synchrotron energy of $\sim$3 keV was derived, higher than typical values of $\sim$0.5-1 keV. VHE observations with MAGIC and VERITAS on June 6-8 show the flux peaking in a bright state, well correlated with the X-rays. This extraordinary set of simultaneous data, covering a twelve-decade spectral range, allowed for a deep analysis of the spectral energy distribution as well as of correlated light curves. The $\gamma$-ray flare can be interpreted within the framework of the synchrotron self-Compton model in terms of a rapid acceleration of leptons in the jet., Comment: accepted for publication in ApJL, 7 pages, 2 figures, 1 table
Published: 2009

16. 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

17. Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing

Author: M. Salvati, K. Shinozaki, Nijil Mankuzhiyil, Jelena Ninkovic, Aaron Dominguez, Michael Backes, Francesco Dazzi, Miguel A. Sánchez-Conde, Abelardo Moralejo, E. Leonardo, Elina Lindfors, M. Camara, A. Saggion, A. Laille, Francesco Longo, W. Wittek, Adrian Biland, Markus Gaug, F. De Sabata, Daniel Mazin, M. Pasanen, R. de los Reyes, S. Rügamer, Florian Goebel, V. Curtef, Nicola Turini, L. S. Stark, A. La Barbera, Laura Maraschi, Pol Bordas, B. De Lotto, V. Scalzotto, R. K. Bock, Fabio Zandanel, Michela Fagiolini, L. O. Takalo, R. J. García López, Riccardo Paoletti, Stefano Covino, Agnieszka Sierpowska-Bartosik, Roberta Zanin, M. López, H. Anderhub, Mosè Mariotti, D. Tescaro, J. M. Paredes, Masaaki Hayashida, Denis Bastieri, Massimo Persic, Antonio Stamerra, Jose Luis Contreras, M. Tluczykont, Diego F. Torres, Juan Cortina, V. Vitale, Marc Ribó, Juan Abel Barrio, J. Zapatero, R. Pegna, Mariano Moles, M. T. Costado, D. Borla Tridon, K. Mannheim, R. Firpo, S. Huber, I. Oya, M. Meyer, M. Garczarczyk, Victor Zabalza, G. Maneva, Daniela Dorner, Enrique Fernández, Saverio Lombardi, E. Carmona, Miguel A. Pérez-Torres, N. Otte, J. Hose, Petar Temnikov, M. De Maria, M. Shayduk, I. Britvitch, Elisa Bernardini, Valentí Bosch-Ramon, Francisco Prada, Elisa Prandini, V. Scapin, F. Pauss, A. Raymers, K. Berger, Ashot Chilingarian, H. Bartko, A. Sillanpää, A. De Angelis, N. Puchades, K. Nilsson, Felix Spanier, A. Piccioli, A. Venturini, A. Robert, C. Delgado Mendez, Dominik Elsässer, Takashi Saito, Dorota Sobczyńska, Thomas Bretz, S. N. Shore, Nicola Galante, P. Antoranz, R. Mirzoyan, E. Aliu, Wolfgang Rhode, Mario Meucci, E. De Cea del Pozo, L. A. Antonelli, C. C. Hsu, W. Bednarek, Fabrizio Tavecchio, Ll. Font, E. Lorenz, A. Herrero, M. V. Fonseca, T. Jogler, D. Höhne, T. Schweizer, Daniel Ferenc, Daniel Nieto, H. Vankov, P. Majumdar, J. Rico, P. Sartori, Manel Errando, G. Bonnoli, M. Rissi, D. Kranich, L. Peruzzo, D. Hadasch, M. I. Martínez, Masahiro Teshima, N. Sidro, D. Pascoli, Robert Wagner, Konstancja Satalecka, Michele Doro, C. Baixeras, Julian Sitarek, Julia Becker, S. Commichau, Jose Miguel Miranda, 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, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, 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, D., Elsaesser, 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., Hoehne, 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., Puchadesa, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Ruegamer, 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., Sillanpaeae, 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, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, and Universitat de Barcelona
Subjects: Physics::Instrumentation and Detectors, Nuclear physics, IACT, Processament digital d'imatges, Astrophysics, Very High Energy Gamma-ray Astronomy, Detectors, MAGIC telescope, 01 natural sciences, law.invention, Cherenkov images, law, MAGIC (telescope), 010303 astronomy & astrophysics, Physics, Gamma-ray astronomy, Timing analysis, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Temps, Astronomia de raigs X, ddc:540, Electrónica, Física nuclear, Electricidad, Telescopis espacials, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Space telescopes, Time, Telescope, X-ray astronomy, Optics, 0103 physical sciences, Cherenkov radiation, 010308 nuclear & particles physics, business.industry, Astronomy and Astrophysics, Detector, Crab Nebula, business, Digital image processing
Abstract: The Cherenkov light flashes produced by Extensive Air Showers are very short in time. A high bandwidth and fast digitizing readout, therefore, can minimize the influence of the background from the light of the night sky, and improve the performance in Cherenkov telescopes. The time structure of the Cherenkov image can further be used in single-dish Cherenkov telescopes as an additional parameter to reduce the background from unwanted hadronic showers. A description of an analysis method which makes use of the time information and the subsequent improvement on the performance of the MAGIC telescope (especially after the upgrade with an ultra fast 2 GSamples/s digitization system in February 2007) will be presented. The use of timing information in the analysis of the new MAGIC data reduces the background by a factor two, which in turn results in an enhancement of about a factor 1.4 of the flux sensitivity to point-like sources, as tested on observations of the Crab Nebula., 27 pages, 11 figures, accepted by Astroparticle Physics
Published: 2009

18. Upper Limits on the VHE Gamma-Ray Emission from the Willman 1 Satellite Galaxy with the Magic Telescope

Author: E. Aliu, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, H. Bartko, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, D. Bose, T. Bretz, I. Britvitch, M. Camara, E. Carmona, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hadasch, M. Hayashida, A. Herrero, D. Höhne-Mönch, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, N. Otte, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sanchez-Conde, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sierpowska-Bartosik, A. Sillanpää, 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. Torres, N. Turini, H. Vankov, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, E., Aliu, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, H., Bartko, 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, 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., Hohne Monch, 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, 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, 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, K., Shinozaki, 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: SUBSTRUCTURE, Astrophysics::High Energy Astrophysical Phenomena, DARK-MATTER ANNIHILATION, Dark matter, Flux, FOS: Physical sciences, Astrophysics, 01 natural sciences, MILKY-WAY, DWARF GALAXY, GALACTIC SATELLITES, URSA-MAJOR, SEARCH, SIGNAL, HALOS, SUPERSYMMETRY, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Dark Matter, Cosmology:dark matter, Raigs gamma, 0103 physical sciences, Satellite galaxy, 010303 astronomy & astrophysics, Cosmic rays, Dwarf galaxy, Physics, Annihilation, 010308 nuclear & particles physics, Astrophysics (astro-ph), Gamma rays, Gamma ray, Bremsstrahlung, Astronomy and Astrophysics, Galaxies, IMAGING CHERENKOV DETECTOR, Galàxies, Space and Planetary Science, gamma ray astronomy, Dark matter (Astronomy), Neutralino, Electrónica, Física nuclear, Matèria fosca (Astronomia), Electricidad
Abstract: We present the result of the observation of the ultrafaint dwarf galaxy Willman 1 performed with the 17 m MAGIC telescope during 15.5 hr between March and May 2008. No significant $\gamma$-ray emission was found. We derived upper limits of the order of $10^{-12}$ ph cm$^{-2}$ s$^{-1}$ on the integral flux above 100 GeV, which we compare with predictions from several of the established neutralino benchmark models in the mSUGRA parameter space. The neutralino annihilation spectra are defined after including the recently quantified contribution of internal bremsstrahlung from the virtual sparticles that mediate the annihilation. Flux boost factors of three orders of magnitude are required even in the most optimistic scenario to match our upper limits. However, uncertainties in the dark matter intrinsic and extrinsic properties (e.g., presence of substructures, Sommerfeld effect) may significantly reduce this gap., Comment: (6 pages, updated to match journal version and reference, Fig. 2 corrected)
Published: 2009

19. The ICARUS liquid argon time projection chamber

Author: P. Cennini, A. Gigli Berzolari, J. Ma, Paola Sala, S. Zheng, S. Centro, E. Calligarich, F. Pietropaolo, Sandro Ventura, F. Lu, G. Piano Mortari, David B. Cline, Chao Zhang, A. Kruse, G. Meng, J. Rico, X. Huan, R. Brunetti, Antonio Bueno, F. Cavanna, Q. Zhang, G. Nurzia, F. Mauri, A. Cesana, C. Vignoli, G. Xu, C. Rossi, C. Matthey, Hui Wang, A. Piazzoli, C. Montanari, J. Woo, K. He, A. Rappoldi, S. Suzuki, S. Petrera, D. Mazza, Mario Campanelli, Z. Li, Z. Xu, R. Dolfini, B. Baiboussinov, Massimo Rossella, P. Torre, Youngho Seo, F. Sergiampietri, P. Goudsmit, C. Carpanese, P. Benetti, F. Arneodo, Elisa Bernardini, Chang Chen, G.L. Raselli, Yi-Chun Chen, P. Picchi, T. Rancati, D. A. Scannicchio, D. Pascoli, G. Battistoni, S. Otwinowski, Arnaud Ferrari, André Rubbia, L. Periale, C. Rubbia, A. Badertscher, L. Mazzone, A. Borio di Tigliole, M. Terrani, O. Palamara, and D. Cavalli
Subjects: Physics, ICARUS, Liquid argon time projection chamber, Nuclear and High Energy Physics, Argon, Time projection chamber, chemistry.chemical_element, Astronomy, Cosmic ray, Particle detector, Imaging, chemistry, Measuring instrument, Liquid argon, Instrumentation
Abstract: Years of R&D allowed the overcoming of the main technological problems in the establishment of the ICARUS technology. A major step of the ICARUS scientific program has been the construction and testing of a 10 m3 prototype, which paved the way for the installation of the first 600 t ICARUS module. We present a summary of the basic principles of the ICARUS technique and some of the events collected exposing the 10 m3 module to cosmic rays at LNGS, from February to May 2000.
Published: 2001

20. Very high energy gamma-ray observations of strong flaring activity in M87 in 2008 February

Author: J. Albert, E. Aliu, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, 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. Bordas, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, M. Hayashida, A. Herrero, D. Höhne, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, N. Otte, I. Oya, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, A. Piccioli, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, 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. Sillanpää, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, M. Tluczykont, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, Universitat de Barcelona, 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. L., 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, 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: Photon, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: individual: M 87, law.invention, gamma rays, Gamma Rays: Observations, Raigs gamma, law, Radio Galaxies, Radio Galaxie, Blazar, Physics, Very High Energy Gamma-ray Astronomy, MAGIC telescope, Astrophysics (astro-ph), Gamma rays, Gamma ray, Astronomy and Astrophysics, Galaxies, Monitoring program, Galàxies, Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Electricidad, Flare
Abstract: M87 is the only known non blazar radio galaxy to emit very high energy (VHE) gamma-rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable above 350 GeV on a timescale as short as 1 day at a significance level of $5.6\sigma$. The highest measured flux reached 15% of the Crab Nebula flux. We observed several substantial changes of the flux level during the 13 day observing period. The flux at lower energies (150 -- 350 GeV), instead, is compatible with being constant. The energy spectrum can be described by a power law with a photon index of $2.30 \pm 0.11_\mathrm{stat} \pm 0.20_\mathrm{syst}$. The observed day-scale flux variability at VHE prefers the M87 core as source of the emission and implies that either the emission region is very compact (just a few Schwarzschild radii) or the Doppler factor of the emitting blob is rather large in the case of a non expanding emission region., Comment: 4 pages, 4 figures, small changes to fit the ApJL version
Published: 2008

21. Discovery of a very high energy gamma-ray signal from the 3C 66A/B region

Author: E. Aliu, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, H. Bartko, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hadasch, M. Hayashida, A. Herrero, D. Höhne-Mönch, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, N. Otte, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, 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. Sillanpää, 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. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, E., Aliu, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, H., Bartko, 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, 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, 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., Hohne Monch, 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, 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, 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, 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, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, and Universitat de Barcelona
Subjects: Photon, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Radio galaxy, ISM: individual: MAGIC J0223+430, FOS: Physical sciences, Astrophysics, 01 natural sciences, Power law, Signal, Raigs gamma, Observacions astronòmiques, 0103 physical sciences, MAGIC (telescope), Blazar, 010303 astronomy & astrophysics, BL Lacertae objects: individual: 3C 66A, gamma rays: observations, Physics, 010308 nuclear & particles physics, Gamma rays, Astrophysics (astro-ph), Gamma ray, Active Galactic Nuclei, Astronomy and Astrophysics, Galaxies, Galàxies, MAGIC telescope, Very High Energy Gamma-ray Astronomy, Space and Planetary Science, Celestial coordinate system, ddc:520, Electrónica, Física nuclear, Electricidad, Astronomical observations
Abstract: The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 h in 2007 August-December. The observations resulted in the discovery of a gamma-ray source at energies above 150 GeV centered at celestial coordinates RA=2h23m12s and DEC=43deg0.7' (MAGIC J0223+430), coinciding with the nearby radio galaxy 3C 66B. A possible association of the excess with the blazar 3C 66A is discussed. The energy spectrum of MAGIC J0223+430 follows a power law with a normalization of (1.7+-0.3_(stat)+-0.6_(syst)) 10^(-11) TeV^(-1)cm^(-2)s^(-1) at 300 GeV and a photon index Gamma=-3.10+-0.31_(stat)+-0.2_(syst). No significant variability of the signal was found during the observation period., Comment: 5 pages, 4 figures, accepted for publication in ApJL. Small corrections
Published: 2008
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22. 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

23. Observation of VHE gamma-rays from Cassiopeia A with the MAGIC telescope

Author: Valentí Bosch-Ramon, Maria Giller, V. Scapin, M. Camara, V. Vitale, Abelardo Moralejo, Jorge Andres Lopez Lopez, E. Carmona, A. Sillanpää, H. Anderhub, T. Schweizer, V. Scalzotto, P. Jacon, P. Sartori, Daniela Dorner, Francesco Longo, W. Wittek, Mosè Mariotti, P. Antoranz, A. Saggion, Masahiro Teshima, Adrian Biland, M. Poller, J. Hose, C. Baixeras, Jelena Ninkovic, Petar Temnikov, M. López, Markus Gaug, Elisa Prandini, Florian Goebel, Riccardo Paoletti, W. Bednarek, Manel Errando, Jose Flix, F. Pauss, Saverio Lombardi, Julia Becker, Ll. Font, A. Robert, S. Commichau, A. Armada, R. Kritzer, Francesco Dazzi, Juan Abel Barrio, Ashot Chilingarian, V. Danielyan, B. De Lotto, V. Curtef, L. S. Stark, Masaaki Hayashida, E. Oña-Wilhelmi, Jose Luis Contreras, J. M. Paredes, Antonio Stamerra, D. Tescaro, I. Britvitch, H. Bartko, Jose Miguel Miranda, Juan Cortina, Tadeusz Wibig, J. A. Coarasa, L. O. Takalo, E. Lorenz, N. Puchades, E. Fernandez, R. Pegna, Pol Bordas, Michele Doro, K. Nilsson, R. Firpo, F. Zandanel, N. Tonello, J. Rico, Thomas Bretz, S. N. Shore, Diego F. Torres, Ciro Bigongiari, R. Mirzoyan, A. Laille, M. Shayduk, N. Otte, M. Pasanen, A. Raymers, A. De Angelis, L. Peruzzo, R. de los Reyes, Nicola Turini, C. Delgado, A. Piccioli, K. Berger, David Paneque, M. Panniello, M. I. Martínez, Nicola Galante, G. Maneva, N. Sidro, Wolfgang Rhode, D. Pascoli, M. Fuchs, Massimo Persic, R. Kosyra, Robert Wagner, K. Mannheim, M. Meyer, C. C. Hsu, M. Garczarczyk, C. Merck, E. Aliu, R. Schmitt, Elina Lindfors, Daniel Mazin, S. Rügamer, Michela Fagiolini, Oriana Mansutti, Dorota Sobczyńska, Justin Albert, J. Zapatero, I. Oya, K. Shinozaki, Roberta Zanin, E. Domingo-Santamaría, A. Herrero, T. Jogler, D. Höhne, R. J. García-López, R. K. Bock, M. Rissi, D. Kranich, T. Hengstebeck, Denis Bastieri, D. Hakobyan, S. Mizobuchi, Alvaro Sanchez, Marc Ribó, M. T. Costado, Daniel Ferenc, H. Vankov, P. Majumdar, Mario Meucci, M. V. Fonseca, Universitat de Barcelona, 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., 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., 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, 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, 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, F., Zandanel, R., Zanin, and J., Zapatero
Subjects: Astrofísica, Photon, Raigs còsmics, Astronomy, PROGENITOR, Astrophysics, law.invention, Raigs gamma, law, Supernova remnant, Physics, SUPERNOVA-REMNANTS, Supernoves, Astrophysics (astro-ph), Gamma ray, 5 GHZ, Particle acceleration, Supernovae, Electrónica, Física nuclear, Electricidad, Very High Energy Gamma-ray Astronomy, Supernova remnants, MAGIC telescope, Telescopis espacials, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, ACCELERATION, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, Space telescopes, Telescope, Angular resolution, Astrophysics::Galaxy Astrophysics, Gamma rays, Astronomy and Astrophysics, Cassiopeia A, Space and Planetary Science, EMISSION, Astronomia, High Energy Physics::Experiment
Abstract: We searched for very high energy (VHE) gamma-ray emission from the supernova remnant Cassiopeia A. The shell-type supernova remnant Cassiopeia A was observed with the 17 meter MAGIC telescope between July 2006 and January 2007 for a total time of 47 hours. The source was detected above an energy of 250 GeV with a significance of 5.2sigma and a photon flux above 1 TeV of (7.3+-0.7_stat+-2.2_sys)10^-13 cm^-2s^-1. The photon spectrum is compatible with a power law dN/dE = A E^-Gamma with a photon index Gamma=2.3+-0.2_stat+-0.2_sys. The source is point-like within the angular resolution of the telescope., Comment: 4 pages, 4 figures, submitted to A&A
Published: 2007

24. Discovery of very high energy gamma-ray emission from the low-frequency peaked BL Lacertae object BL Lacertae

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. D. Angelis, C. Delgado, R. D. L. Reyes, 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. Fuchs, 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, R. Kosyra, D. Kranich, R. Kritzer, A. Laille, E. Lindfors, S. Lombardi, 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, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, M. Poller, E. Prandini, N. Puchades, A. Raymers, 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. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, F. Zandanel, R. Zanin, J. Zapatero, LONGO, FRANCESCO, 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, 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, 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., 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: High energy, Photon, Flux, FOS: Physical sciences, Astrophysics, Low frequency, Observacions astronòmiques, Gamma ray astronomy, Galaxies: individual: BL Lacertae, Astronomia de raigs gamma, MAGIC (telescope), Physics, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Active Galactic Nuclei, Light curve, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, Electrónica, Física nuclear, Electricidad, BL Lac object, Astronomical observations
Abstract: The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and for 26 hr during 2006 July to September. The source is the historical prototype and eponym of a class of low-frequency peaked BL Lacertae (LBL) objects. A very high energy (VHE) gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of 0.6+-0.2 x 10^(-11) cm^(-2) s^(-1) was measured, corresponding to approximately 3% of the Crab flux. The differential spectrum between 150 and 900 GeV is rather steep with a photon index of -3.6+-0.5. The light curve shows no significant variability during the observations in 2005. For the first time a clear detection of VHE gamma-ray emission from an LBL object was obtained with a signal below previous upper limits. The 2006 data show no significant excess. This drop in flux follows the observed trend in optical activity., Comment: Accepted for publication in ApJ Letters, 4 pages, 5 figures, Figure-5 revised, Minor corrections following the referee report
Published: 2007

25. Discovery of very high energy gamma radiation from IC 443 with the MAGIC telescope

Author: Daniela Dorner, K. Berger, Manel Errando, H. Anderhub, M. Shayduk, J. Hose, A. Raymers, A. De Angelis, Petar Temnikov, M. Camara, A. Piccioli, Nicola Galante, M. I. Martínez, T. Hengstebeck, P. Jacon, V. Danielyan, Florian Goebel, Dorota Sobczyńska, I. Britvitch, Justin Albert, M. Rissi, C. Merck, J. M. Paredes, P. Sartori, Denis Bastieri, N. Puchades, Antonio Stamerra, Elina Lindfors, N. Otte, D. Kranich, V. Curtef, A. Sillanpää, Takashi Saito, M. López, Alvaro Sanchez, Daniel Mazin, A. Armada, Masahiro Teshima, E. Oña-Wilhelmi, R. J. García-López, D. Pascoli, S. Rügamer, D. Hakobyan, S. Mizobuchi, Thomas Bretz, A. Saggion, S. N. Shore, Elisa Prandini, Enrique Fernández, M. Fuchs, Massimo Persic, L. O. Takalo, R. Firpo, R. Schmitt, Marc Ribó, Juan Abel Barrio, Valentí Bosch-Ramon, R. Mirzoyan, Adrian Biland, Michele Doro, V. Scapin, Daniel Nieto, Markus Gaug, J. A. Coarasa, M. T. Costado, V. Vitale, Michela Fagiolini, Oriana Mansutti, Artemio Herrero, A. Robert, Mario Meucci, M. Panniello, Ashot Chilingarian, T. Jogler, E. Aliu, D. Höhne, C. Delgado, Francesco Longo, Wolfgang Rhode, K. Shinozaki, R. K. Bock, F. Pauss, T. Schweizer, R. Kosyra, Robert Wagner, M. V. Fonseca, F. Zandanel, L. S. Stark, J. Zapatero, Riccardo Paoletti, I. Oya, W. Wittek, P. Antoranz, Roberta Zanin, Daniel Ferenc, J. Rico, A. Laille, Mosè Mariotti, H. Vankov, N. Sidro, Julia Becker, S. Commichau, K. Nilsson, M. Pasanen, David Paneque, E. Domingo-Santamaría, P. Majumdar, C. C. Hsu, K. Mannheim, R. de los Reyes, Nicola Turini, M. Meyer, M. Garczarczyk, Jose Miguel Miranda, L. Peruzzo, Saverio Lombardi, Maria Giller, E. Carmona, G. Maneva, C. Baixeras, Pol Bordas, D. Tescaro, Tadeusz Wibig, E. Lorenz, V. Scalzotto, Masaaki Hayashida, Jose Luis Contreras, Juan Cortina, R. Pegna, W. Bednarek, Jose Flix, Ll. Font, Jelena Ninkovic, Francesco Dazzi, Diego F. Torres, Ciro Bigongiari, J. López, R. Kritzer, B. De Lotto, H. Bartko, Abelardo Moralejo, 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., 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, D., Paneque, 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: High energy, Supernova remnants, Astrophysics, Radiation, Power law, Coincident, Observacions astronòmiques, Supernova remnant, Gamma ray astronomy, Astronomia de raigs gamma, MAGIC (telescope), Physics, Supernoves, Astronomy, Astronomy and Astrophysics, Galactic plane, Very high energy gamma ray astronomy, Supernovae, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, Electrónica, Física nuclear, Electricidad, gamma rays: observations, Astronomical observations
Abstract: We report the detection of a new source of very high energy (VHE; E-gamma >= 100 GeV) gamma- ray emission located close to the Galactic plane, MAGIC J0616 + 225, which is spatially coincident with supernova remnant IC 443. The observations were carried out with the MAGIC telescope in the periods 2005 December-2006 January and 2006 December-2007 January. Here we present results from this source, leading to a VHE gamma-ray signal with a statistical significance of 5.7 sigma in the 2006/2007 data and a measured differential gamma-ray flux consistent with a power law, described as dN(gamma)/(dA dt dE) = (1.0 +/- 0.2) x 10(-11) (E/0.4 TeV)(-3.1 +/- 0.3) cm(-2) s(-1) TeV-1. We briefly discuss the observational technique used and the procedure implemented for the data analysis. The results are placed in the context of the multiwavelength emission and the molecular environment found in the region of IC 443.
Published: 2007

26. 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

27. Discovery of very high energy gamma-rays from 1ES 1011+496 at z=0.212

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, M. Fuchs, N. Galante, R. J. García-López, M. Garczarczyk, M. Gaug, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, A. Herrero, D. Höhne, J. Hose, C. C. Hsu, P. Jacon, T. Jogler, R. Kosyra, D. Kranich, R. Kritzer, A. Laille, E. Lindfors, S. Lombardi, F. Longo, J. López, M. López, E. Lorenz, P. Majumdar, G. Maneva, K. Mannheim, O. Mansutti, M. Mariotti, M. Martínez, D. Mazin, C. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, E. Oña-Wilhelmi, N. Otte, I. Oya, D. Paneque, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, E. Perlman, M. Persic, L. Peruzzo, A. Piccioli, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Saito, A. Sánchez, P. Sartori, V. Scalzotto, V. Scapin, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczynska, A. Stamerra, L. S. Stark, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, F. Zandanel, R. Zanin, J. Zapatero, 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., 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, D., Paneque, M., Panniello, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R., Pegna, E., Perlman, 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, F., Tavecchio, 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: Photon, Absorption spectroscopy, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, quasars: individual (1ES 1011+496), Gamma Rays: Observations, Physics, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Active Galactic Nuclei, Redshift, Galaxy, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, Electrónica, Física nuclear, Electricidad, BL Lac object, Visible spectrum
Abstract: We report on the discovery of Very High Energy (VHE) gamma-ray emission from the BL Lacertae object 1ES1011+496. The observation was triggered by an optical outburst in March 2007 and the source was observed with the MAGIC telescope from March to May 2007. Observing for 18.7 hr we find an excess of 6.2 sigma with an integrated flux above 200 GeV of (1.58$\pm0.32) 10^{-11}$ photons cm$^{-2}$ s$^{-1}$. The VHE gamma-ray flux is >40% higher than in March-April 2006 (reported elsewhere), indicating that the VHE emission state may be related to the optical emission state. We have also determined the redshift of 1ES1011+496 based on an optical spectrum that reveals the absorption lines of the host galaxy. The redshift of z=0.212 makes 1ES1011+496 the most distant source observed to emit VHE gamma-rays up to date., 4 pages, 6 figures, minor changes to fit the ApJ version
Published: 2007

28. ICARUS. A status report

Author: David B. Cline, P. Torre, P. Cennini, P. Picchi, Paola Sala, Z. Xu, M. Nicoletto, F. Cavanna, L. Periale, Silvia Resconi, Yi Chen, A. Piazzoli, J. Ma, M. Terrani, Hui Wang, S. Zheng, E. Calligarich, Massimo Rossella, Alessandro Bettini, R. Dolfini, Chao Zhang, F. Arneodo, F. Mauri, C. Vignoli, Q. Zhang, L. Mazzone, G. Piano-Mortari, D. Pascoli, C. Rubbia, J. Woo, A. Benetti, S. Parlati, C. Carpanese, K. He, D. A. Scannicchio, F. Sergiampietri, F. Pietropaolo, A. Cesana, Z. Li, F. Lu, A. Borio, P. Benetti, X.P. Huang, M. Verdecchia, J. P. Revol, S. Otwinowski, G. Xu, D. Cavalli, C. Montanari, André Rubbia, A. Pepato, Chang Chen, G.L. Raselli, Andrea Ferrari, Sandro Ventura, C. Rossi, A. Rappoldi, Shingo Suzuki, G. Mannocchi, S. Centro, and A. Gigli Berzolari
Subjects: Physics, ICARUS, Nuclear and High Energy Physics, Large Hadron Collider, business.industry, Liquid argon, Aerospace engineering, Neutrino, Neutrino oscillation, Status report, business, Atomic and Molecular Physics, and Optics, Simulation
Abstract: The latest evolutions of the ICARUS project are reviewed. During the present year the collaboration has been heavily involved into the construction of the first full scale prototypes of the 600 ton ICARUS detector. Cryogenic and purification tests as well as mechanical tests on a wires chamber module, are presently under completion. No major problems were found and we foresee to be ready for the commissioning of the major detector components by the end of the present year. Also, the Long Baseline Neutrino Oscillation program has been subject to a rapid acceleration. Following our formal proposal, submitted and approved at the beginning of this year by the CERN SPSLC, a working group has been formed to study the details of the beam and a sensitive program has been formulated by which first neutrinos can be sent to the Gran Sasso at the end of year 2001.
Published: 1999

29. Discovery of very high energy gamma rays from 1ES 1218+30.4

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, 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, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, 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. Höhne, J. Hose, P. Jacon, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, J. López, M. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, M. Poller, E. Prandini, W. Rhode, J. Rico, B. Riegel, M. Rissi, A. Robert, S. Rügamer, A. Saggion, A. Sánchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczyńska, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, A. Vardanyan, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, 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, 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., 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, M., Persic, L., Peruzzo, A., Piccioli, M., Poller, E., Prandini, W., Rhode, J., Rico, 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, 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: BL Lacertae objects: individual (1ES 1218+30.4), Gamma Rays: Observations, Astrophysics, 01 natural sciences, Power law, law.invention, Telescope, law, individual (1ES 1218+30.4) [BL Lacertae objects], 0103 physical sciences, Energy spectrum, 010303 astronomy & astrophysics, Cherenkov radiation, Gamma Rays: Observation, Physics, 010308 nuclear & particles physics, Observations [Gamma Rays], Gamma ray, Astronomy, Astronomy and Astrophysics, Redshift, Space and Planetary Science, Electrónica, Física nuclear, Electricidad
Abstract: The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218 + 30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 sigma significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F-E = (8.1 +/- 2.1) x 10(-7)[E/(250 GeV)](-3.0 +/- 0.4) TeV-1 F (E) m(-2) s(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.
Published: 2006

30. Observation of very high energy gamma-ray emission from the active galactic nucleus 1ES 1959+650 using the MAGIC telescope

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, 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. Contreras, J. Cortina, V. Danielyan, F. Dazzi, A. . Angelis, R. . los, B. . Lotto, E. Domingo Santamar\ia, D. Dorner, M. Doro, M. Errando, D. Ferenc, E. Fernandez, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, J. Gebauer, R. Giannitrapani, 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. Lindfors, J. Lopez, M. Lopez, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Mart\inez, K. Mase, D. Mazin, C. Merck, 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. Pauss, N. Pavel, R. Pegna, L. Peruzzo, A. Piccioli, M. Pin, E. Prandini, J. Rico, W. Rhode, B. Riegel, M. Rissi, A. Robert, G. Rossato, S. R\ugamer, A. Saggion, A. Sanchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, N. Sidro, A. Sillanp\a\a, D. Sobczynska, A. Stamerra, L. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, LONGO, FRANCESCO, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, H., Bartko, D., Bastieri, 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., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamar\ia, D., Dorner, M., Doro, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, J., Gebauer, R., Giannitrapani, 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, C., Merck, 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, M., Pin, E., Prandini, J., Rico, W., Rhode, B., Riegel, M., Rissi, A., Robert, G., Rossato, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., 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, and J., Zapatero
Subjects: RADIO-SOURCES, Active galactic nucleus, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics::High Energy Astrophysical Phenomena, galaxies: individual (1ES 1959+650), TEV BLAZAR 1ES-1959+650, ACCELERATION, SENSITIVITY, NEUTRINOS, SPECTRA, OBJECTS, Flux, Astrophysics, Galaxies: Active, Gamma Rays: Observations, MAGIC (telescope), Cherenkov radiation, Physics, Observations [Gamma Rays], Gamma ray, HEGRA, Astronomy and Astrophysics, Light curve, Active [Galaxies], Crab Nebula, Space and Planetary Science, Electrónica, Física nuclear, Electricidad, individual (1ES 1959+650) [galaxies]
Abstract: The MAGIC Cerenkov telescope has observed very high energy (VHE) gamma-ray emission from the active galactic nucleus 1ES 1959+650 during 6 hr in 2004 September and October. The observations were carried out alternating with observations of the Crab Nebula, whose data were used as a reference source for optimizing gamma -ray/hadron separation and for flux comparison. The data analysis shows VHE gamma-ray emission of 1ES 1959+650 with similar to 8 sigma significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above similar to 180 GeV of about 20% that of the Crab Nebula was obtained. The light curve, sampled over 7 days, shows no significant variations. The differential energy spectrum between 180 GeV and 2 TeV can be fitted with a power-law of index -2.72 +/- 0.14. The spectrum is consistent with the slightly steeper spectrum seen by HEGRA at higher energies, also during periods of low X-ray activity.
Published: 2006

31. Flux upper limit on gamma-ray emission by GRB 050713a from magic telescope observations

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, 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. Contreras, J. Cortina, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, 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. Höhne, J. Hose, P. Jacoń, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, J. López, M. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, E. Prandini, W. Rhode, J. Rico, B. Riegel, M. Rissi, A. Robert, S. Rügamer, A. Saggion, A. Sánchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. Shore, N. Sidro, A. Sillanpää, D. Sobczyńska, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, A. Vardanyan, V. Vitale, R. M. Wagner, T. Wibig, W. Wittek, J. Zapatero, 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., 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, M., Persic, L., Peruzzo, A., Piccioli, E., Prandini, W., Rhode, J., Rico, 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., 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, A., Vardanyan, V., Vitale, R. M., Wagner, T., Wibig, W., Wittek, and J., Zapatero
Subjects: Physics, Twilight, Observation [Gamma Rays], Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma Rays: Bursts, Gamma Rays: Observations, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Very High Energy Gamma-ray Astronomy, Redshift, Space and Planetary Science, Electrónica, Física nuclear, MAGIC (telescope), Burst [Gamma Rays], Electricidad, Gamma-ray burst
Abstract: The long-duration GRB050713a was observed by the MAGIC Telescope, 40 seconds after the burst onset, and followed up for 37 minutes, until twilight. The observation, triggered by a SWIFT alert, covered energies above ~175 GeV. Using standard MAGIC analysis, no evidence for a gamma signal was found. As the redshift of the GRB was not measured directly, the flux upper limit, estimated by MAGIC, is still compatible with the assumption of an unbroken power-law spectrum extending from a few hundred keV to our energy range., Comment: 14 pages, 4 figures, submitted to ApJ
Published: 2006

32. MAGIC observations of very high energy gamma-rays from HESS J1813-178

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, A. Armada, M. Asensio, C. Baixeras, J. A. Barrio, M. Bartel, H. Bartko, D. Bastieri, R. Bavikadi, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, E. Bisesi, O. Blanch, R. K. Bock, T. Bretz, I. Britvitch, M. Camara, A. Chilingarian, S. Ciprini, J. A. Coarasa, S. Commichau, J. L. Contreras, J. Cortina, V. Curtev, V. Danielyan, F. Dazzi, A. De Angelis, R. de los Reyes, B. De Lotto, E. Domingo-Santamaria, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, N. Galante, M. Garczarczyk, M. Gaug, J. Gebauer, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, D. Höhne, J. Hose, P. Jacon, O. Kalekin, D. Kranich, A. Laille, T. Lenisa, P. Liebing, E. Lindfors, F. Longo, M. López, J. López, E. Lorenz, F. Lucarelli, P. Majumdar, G. Maneva, K. Mannheim, M. Mariotti, M. Martínez, K. Mase, D. Mazin, C. Merck, M. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, E. Oña-Wilhelmi, R. Orduña, N. Otte, I. Oya, D. Paneque, R. Paoletti, M. Pasanen, D. Pascoli, F. Pauss, N. Pavel, R. Pegna, L. Peruzzo, A. Piccioli, E. Prandini, J. Rico, W. Rhode, B. Riegel, M. Rissi, A. Robert, G. Rossato, S. Rügamer, A. Saggion, A. Sanchez, P. Sartori, V. Scalzotto, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. Shore, N. Sidro, A. Sillanpää, D. Sobczynska, A. Stamerra, L. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, N. Tonello, A. Torres, D. F. Torres, N. Turini, H. Vankov, V. Vitale, R. Wagner, T. Wibig, W. Wittek, J. Zapatero, J., Albert, E., Aliu, H., Anderhub, P., Antoranz, A., Armada, M., Asensio, C., Baixera, J. A., Barrio, M., Bartel, H., Bartko, D., Bastieri, R., Bavikadi, W., Bednarek, K., Berger, C., Bigongiari, A., Biland, E., Bisesi, O., Blanch, R. K., Bock, T., Bretz, I., Britvitch, M., Camara, A., Chilingarian, S., Ciprini, J. A., Coarasa, S., Commichau, J. L., Contrera, J., Cortina, V., Curtev, V., Danielyan, F., Dazzi, Angelis, A., Los, R., Lotto, B., E., Domingo Santamaria, 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, J., Gebauer, 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, M., Lopez, J., Lopez, E., Lorenz, F., Lucarelli, P., Majumdar, G., Maneva, K., Mannheim, M., Mariotti, M., Mart\inez, K., Mase, D., Mazin, C., Merck, 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, G., Rossato, S., R\ugamer, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, R., Schmitt, T., Schweizer, M., Shayduk, K., Shinozaki, S., Shore, N., Sidro, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., Stark, L., Takalo, P., Temnikov, D., Tescaro, M., Teshima, N., Tonello, A., Torre, D. F., Torre, N., Turini, H., Vankov, V., Vitale, R., Wagner, T., Wibig, W., Wittek, and J., Zapatero
Subjects: Astrofísica, High energy, Observation [Gamma Rays], Acceleration of Particles, Gamma Rays: Observations, ISM: Supernova Remnants, FOS: Physical sciences, Astrophysics, Power law, Supernova Remnants [ISM], Coincident, Cosmic rays, Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Astrophysics (astro-ph), Magic (programming), Gamma ray, Astronomy and Astrophysics, Galactic plane, Space and Planetary Science, Acceleration of Particle, Electrónica, Física nuclear, Electricidad, acceleration of particles
Abstract: Recently, the HESS collaboration 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 J1813-178 has sparked particular interest, as subsequent radio observations imply an association with SNR G12.82-0.02. Triggered by the detection in VHE gamma-rays, a positionally coincident source has also been found in INTEGRAL and ASCA data. In this Letter we present MAGIC observations of HESS J1813-178, resulting in the detection of a differential gamma-ray flux consistent with a hard-slope power law, described as dN/(dA dt dE) = (3.3+/-0.5)*10^{-12} (E/TeV)^{-2.1+/-0.2} cm^(-2)s^(-1)TeV^(-1). We briefly discuss the observational technique used, the procedure implemented for the data analysis, and put this detection in the perspective of multifrequency observations., Accepted by ApJ Letters
Published: 2006

33. Physics and astrophysics with a ground-based gamma-ray telescope of low energy threshold

Author: V. Scalzotto, V. Danielyan, M. Pin, Thomas Bretz, Francesco Longo, W. Wittek, O. C. de Jager, Miriam Lucio Martinez, Jose Flix, Ll. Font, Josue J. Lopez, E. Fernandez, F. Lucarelli, N. Otte, R. Giannitrapani, Stefano Ciprini, Oscar Blanch, A. Robert, N. Tonello, R. Orduña, Jose Luis Contreras, M. V. Fonseca, Juan Cortina, V. Vitale, Riccardo Paoletti, K. Mase, E. Lorenz, P. Sartori, Daniel Ferenc, T. Hengstebeck, E. Ona-Wilhelmi, E. Bisesi, Ciro Bigongiari, Antonio Stamerra, Francesco Dazzi, M. Pasanen, S. Commichau, Denis Bastieri, J. Albert i Fort, Dorota Sobczyńska, Felicitas Pauss, T. Lenisa, A. Sillanpää, R. Firpo, M. Meyer, Daniela Dorner, Elina Lindfors, M. Merck, Daniel Mazin, B. De Lotto, A. Torres, G. Rossato, M. Garczarczyk, Karl Mannheim, D. Kranich, M. A. Lopez, Dieter Renker, H. Bartko, R. G. Pegna, K. Shinozaki, M. Gaug, Abelardo Moralejo, A. Laille, L. Peruzzo, Tadeusz Wibig, W. Bednarek, Ashot Chilingarian, O. Kalekin, Mario Meucci, J. Gebauer, C. Merck, A. Sánchez, G. Viertel, T. Schweizer, P. Jacon, R. de los Reyes, Nicola Turini, D. Pascoli, R. Mirzoyan, A. Saggion, Adrian Biland, J. Rico, Maria Giller, L. S. Stark, S. Mizobuchi, N. Pavel, S. Volkov, R. K. Bock, Masahiro Teshima, C. Baixeras, O. Epler, E. Domingo, David Paneque, Robert Wagner, Michele Doro, M. Shayduk, A. De Angelis, A. Piccioli, Nicola Galante, A. Armada, Mosè Mariotti, Florian Goebel, L. O. Takalo, J. A., I., A., Armada, C., Baixera, H., Bartko, D., Bastieri, W., Bednarek, C., Bigongiari, A., Biland, E., Bisesi, O., Blanch, R. K., Bock, T., Bretz, A., Chilingarian, S., Ciprini, S., Commichau, J. L., Contrera, J., Cortina, V., Danielyan, F., Dazzi, Angelis, A., Lotto, B., E., Domingo, D., Dorner, M., Doro, O., Epler, D., Ferenc, E., Fernandez, R., Firpo, J., Flix, M. V., Fonseca, L., Font, N., Galante, M., Garczarczyk, M., Gaug, J., Gebauer, R., Giannitrapani, M., Giller, F., Goebel, T., Hengstebeck, P., Jacon, O. C., De, O., Kalekin, D., Kranich, A., Laille, T., Lenisa, E., Lindfor, Longo, Francesco, M., Lopez, J., Lopez, E., Lorenz, F., Lucarelli, K., Mannheim, M., Mariotti, M., Martinez, K., Mase, D., Mazin, C., Merck, M., Merck, M., Meucci, M., Meyer, R., Mirzoyan, S., Mizobuchi, A., Moralejo, E., O\~na Wilhelmi, R., Ordu\~na, N., Otte, D., Paneque, R., Paoletti, M., Pasanen, D., Pascoli, F., Pau, N., Pavel, R., Pegna, L., Peruzzo, A., Piccioli, M., Pin, Los, R., J., Rico, D., Renker, A., Robert, G., Rossato, A., Saggion, A., Sanchez, P., Sartori, V., Scalzotto, T., Schweizer, M., Shayduk, K., Shinozaki, A., Sillanp\a\a, D., Sobczynska, A., Stamerra, L., Stark, L., Takalo, M., Teshima, N., Tonello, A., Torre, N., Turini, G., Viertel, V., Vitale, S., Volkov, R., Wagner, T., Wibig, and W., Wittek
Subjects: Physics, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, Cosmic rays, CHERENKOV TELESCOPE, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, low-energy gamma-ray, Cherenkov telescope, Astrophysics, Cosmology, Astronomy and Astrophysics, Observable, Cosmic ray, Gamma-ray astronomy, Cherenkov Telescope Array, Very High Energy Gamma-ray Astronomy, Satellite, Cherenkov radiation, Fermi Gamma-ray Space Telescope
Abstract: Ground-based Cherenkov telescopes have made in recent years important contributions to high energy gamma-ray astronomy. A lower energy threshold, considerably below 100 GeV, and improved sensitivity will be key parameters to extend their role. A lower threshold will permit these instruments to cover wavelengths with good overlap with satellite experiments, thus providing essential complementary information. The latest generation of Imaging Air Cherenkov Telescopes was built with this criterion in mind. Preliminary studies concerning further progress in the same direction have started. We discuss in this contribution the astrophysics and physics arguments for lowering the observable energy threshold as far as the Cherenkov technique permits, and the ensuing complementarity to results obtained with a GLAST-like satellite.
Published: 2005

34. Performance evaluation of a hit finding algorithm for the ICARUS detector

Author: R. Dolfini, A. Piazzoli, P. Cennini, C. Carpanese, Massimo Rossella, Paola Sala, F. Arneodo, C. Rubbia, S. Centro, G. Xu, L. Mazzone, J. P. Revol, C. Montanari, F. Sergiampietri, C. Vignoli, Alessandro Bettini, M. Verdecchia, Hui Wang, Paola Torre, A. Gigli Berzolari, F. Mauri, Z. Xu, Q. Zhang, F. Lu, S. Parlati, P. Benetti, F. Pietropaolo, Sandro Ventura, M. Nicoletto, Silvia Resconi, Chao Zhang, S. Otwinowski, F. Cavanna, A. Pepato, G. Piano Mortari, J. Woo, K. He, A. Cesana, Z. Li, A. Borio, J. Ma, S. Zheng, E. Calligarich, Yi Chen, D. A. Scannicchio, D. Pascoli, G. Mannocchi, C. Rossi, I. De Mitri, A. Rappoldi, Chang Chen, G.L. Raselli, Shingo Suzuki, David B. Cline, M. Terrani, P. Picchi, A. Ferrari, D. Cavalli, L. Periale, and X.P. Huang
Subjects: Physics, ICARUS, Nuclear and High Energy Physics, Robustness (computer science), Detector, Cosmic ray, Raw data, Instrumentation, Algorithm, Data reduction
Abstract: A procedure to filter the ICARUS digitized data is presented. The final multi-kiloton detector will provide raw data at a rate of the order of 100 Gbytes/s and therefore a crucial element of the acquisition chain will be the on-line data reduction system. A filter has been developed to process the signals and to tag the meaningful data. The hit detection efficiency has been evaluated on a sample of signals obtained from cosmic rays events in the 3 t ICARUS prototype. Its robustness has been tested also on simulated events with different signal to noise ratio. The hit finder hardware implementation is also presented.
Published: 1998

35. ARIANNA: the Icarus experiment readout module

Author: D. Pascoli, F. Pietropaolo, S. Centro, Sandro Ventura, G. Pratali, C. Carpanese, and M. Lippi
Subjects: ICARUS, Nuclear and High Energy Physics, Engineering, Time projection chamber, business.industry, Detector, Electrical engineering, Chip, Data acquisition, Nuclear Energy and Engineering, Application-specific integrated circuit, Nuclear electronics, Continuous signal, Electrical and Electronic Engineering, business, Computer hardware
Abstract: Icarus detector is a liquid Argon Time Projection Chamber that requires continuous signal recording for each channel to provide three dimensional images of any ionizing event. A complete drift volume imaging of the next 600 ton module will result in 1.15 Gbit, with a data rate of 1.15 Tbit/s. The collected data can be highly reduced by recognizing Regions Of Interest (ROI) of the signal by means of a custom hit finding unit (DAEDALUS) working pipelined in the data acquisition path. DAEDALUS is an ASIC that implements an algorithm developed for hit detection and proven to be very efficient both on real and on simulated data. Since only ROI's are saved in memory and contiguous regions can be correlated to enhance detector self triggering capability, a high efficiency zero skipping is obtained in real time. A VME board hosting 16 Icarus digital channels has been designed and built as a demonstrator for functionality and performance test. The board, named ARIANNA, and DAEDALUS chip are here presented in detail.
Published: 1998

36. The liquid argon TPC for the ICARUS experiment

Author: G. Mannocchi, S. Otwinowski, P. Picchi, A. Pepato, P. Cennini, Paola Sala, M. Terrani, C. Rossi, E. Calligarich, P. Benetti, C. Carpanese, A. Rappoldi, A. Borio, F. Casagrande, P. Torre, F. Arneodo, L. Periale, David B. Cline, J. P. Revol, H. Wang, E. Cesana, S. Centro, F. Cavanna, G. Piano Mortari, D. Cavalli, C. Vignoli, D. A. Scannicchio, C. Rubbia, Silvia Resconi, D. Pascoli, F. Sergiampietri, Alessandro Bettini, M. Verdecchia, Sandro Ventura, Andrea Ferrari, Massimo Rossella, G.L. Raselli, F. Mauri, S. Parlati, F. Pietropaolo, R. Dolfini, S. Suzuki, A. Gigli Berzolari, C. Montanari, and A. Piazzoli
Subjects: ICARUS, Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Proton decay, Orders of magnitude (temperature), Solar neutrino, Detector, Atomic and Molecular Physics, and Optics, Nuclear physics, Physical phenomena, Liquid argon, High Energy Physics::Experiment, Neutrino, Nuclear Experiment
Abstract: The ICARUS project aims at the realisation of a large liquid argon TPC to be run at the Underground Laboratories of Gran Sasso in Italy. An intense R&D activity has put on firm grounds this new detector technology and experimentally confirmed its feasibility on a few ton scale. Based on these solid achievements, the collaboration is now confident of being able to build and safely operate a multi-kton detector. The reseach program of the experiment involves the systematic study of a wide spectrum of physical phenomena covering many orders of magnitude in the energy deposited in the detector: from the few MeV of solar neutrino interactions, to the about one GeV of the proton decay and atmospheric neutrinos, up to the higher energies of neutrinos from accelerators.
Published: 1997

37. The Blitzen array processor as second level trigger element: Evaluation of performance on CDF calorimeter data

Author: C. Carpanese, Elettra Siliotto, Giovanni Busetto, and D. Pascoli
Subjects: Physics, Nuclear and High Energy Physics, Calorimeter (particle physics), Sample (graphics), Computational science, law.invention, Vector processor, law, High Energy Physics::Experiment, Level trigger, Fermilab, Collider, Instrumentation, Massively parallel, Energy (signal processing)
Abstract: The performance of the massively parallel Blitzen processor in real-time cluster finding is presented. The efficiency in energy cluster detection and the related energy measurement has been evaluated on a sample of calorimeter data collected by the CDF experiment at pp Fermilab collider. A comparison with the CDF off-line analysis is reported; also given are the algorithm execution times on a Blitzen simulated structure and on a few commercial processors.
Published: 1995

38. Real-time parallel processing in high energy physics: architecture of the Blitzen data acquisition system

Author: D. Pascoli, S. Centro, G. Urso, Edward W. Davis, Ping Ni, and R. A. (Fred) Heaton
Subjects: Superconducting Super Collider, Large Hadron Collider, Data acquisition, Parallel processing (DSP implementation), Computer science, Real-time computing, General Engineering, Particle physics experiments, Chip, Energy (signal processing), VMEbus, Computational science
Abstract: Data acquisition and processing systems for particle physics experiments in new high energy colliders (the Large Hadron Collider at CERN in Europe and the Superconducting Super Collider in the US) impose extreme demands on communication and processing systems. There is a requirement for resources to acquire interesting data from the vast quantity produced during experiments, to find events of interest in the data such as particle tracks and peaks of energy, and to analyze the physics of the experiments. Real-time response with 15 ns collision intervals is achieved through embedded, heterogeneous, hierarchical architectures with highly parallel processing components. The data acquisition computing environment is described. Emphasis is placed on the design of a prototype parallel processing system for the middle level of the hierarchy. Key features are the Blitzen parallel processing chip, HiPPI and VME interfaces, and logic to reformat data between heterogeneous devices.
Published: 1994

39. Evaluating parallel architectures for two real-time applications with 100 kHz repetition rate (hadron collider data)

Author: P. Busson, S. Centro, R. Manner, W. Lourens, Arie Taal, A. Sobala, F. Klefenz, W. Krischer, Géza Ódor, Gyorgy Vesztergombi, A. Gheorghe, I. Legrand, A. Thielmann, K.H. Noffz, E. Denes, P. Malecki, D. Pascoli, Jos Vermeulen, N. Tchamov, J. Badier, Ping Ni, R. Zoz, Edward W. Davis, R.K. Bock, Claude Charlot, and Z. Natkaniec
Subjects: Nuclear and High Energy Physics, Data processing, Large Hadron Collider, Computer science, business.industry, Feature extraction, Electrical engineering, Context (language use), Parallel computing, Vector processor, Nuclear Energy and Engineering, Parallel processing (DSP implementation), SIMD, Kilobyte, Electrical and Electronic Engineering, business
Abstract: In the context of research and development activities for future hadron colliders, competitive implementations of real-time algorithms for feature extraction have been made on various forms of commercial pipelined and parallel architectures. The algorithms used for benchmarking serve for decision making and are of relative complexity; they are required to run with a repetition rate of 100 kHz on data sets of kilobyte size. Results are reported and discussed in detail. Among the commercially available architectures, pipelined image processing systems can compete with custom-designed architectures. General-purpose processors with systolic mesh connectivity can also be used. Massively parallel systems of the SIMD type (many processors executing the same program on different data) are less suitable in the presently marketed form. >
Published: 1993

40. MAGIC Collaboration: Contributions to the 31st International Cosmic Ray Conference (ICRC 2009)

Author: Collaboration, The MAGIC, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, D. Bose, I. Braun, T. Bretz, D. Britzger, M. Camara, E. Carmona, A. Carosi, P. Colin, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, F. Dazzi, A. De Angelis, E. De Cea Del Pozo, C. Delgado Mendez, R. De Los Reyes, B. De Lotto, M. De Maria, F. De Sabata, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, N. Godinovic, F. Goebel, D. Hadasch, A. Herrero, D. Hildebrand, D. Höhne-Mönch, J. Hose, D. Hrupec, C. C. Hsu, T. Jogler, S. Klepser, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, J. M. Miranda, R. Mirzoyan, H. Miyamoto, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, R. Orito, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, I. Puljak, I. Reichardt, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sánchez-Conde, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, S. N. Shore, A. Sierpowska-Bartosik, A. Sillanpää, 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. Torres, N. Turini, H. Vankov, R. M. Wagner, V. Zabalza, F. Zandanel, R. Zanin, and J. Zapatero
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), astro-ph.HE, Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.CO, FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics (astro-ph.IM), astro-ph.IM, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Index entry listing the contributed papers of the MAGIC collaboration to the 31th International Cosmic Ray Conference (ICRC 2009), July 7-15 2009, \L\'od\'z, Poland. The individual papers are sorted by subject: Overview and Highlight Papers; MAGIC-II Status and Components; Software and Analysis Techniques; Technical Developments; Scientific Results. This HTML document includes clickable links to the papers that exist on the astro-ph arXiv. We hope that this will make it easy to access the MAGIC contributions in a systematic way., Comment: Index of the MAGIC conference proceedings for ICRC 2009. Added 6 papers missing in v1
Published: 2009

41. Upper limit for gamma-ray emission above 140 GeV from the dwarf spheroidal galaxy Draco

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, M. Backes, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, P. Bordas, V. Bosch‐Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, V. Danielyan, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, M. Fuchs, N. Galante, R. J. García‐López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, A. Herrero, D. Höhne, J. Hose, S. Huber, C. C. Hsu, P. Jacon, T. Jogler, R. Kosyra, D. Kranich, A. Laille, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, M. Mariotti, M. Martínez, D. Mazin, C. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, E. Oña‐Wilhelmi, N. Otte, I. Oya, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. A. Pérez‐Torres, M. Persic, L. Peruzzo, A. Piccioli, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, A. Sánchez, M. Sánchez‐Conde, P. Sartori, V. Scalzotto, V. Scapin, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, F. Zandanel, R. Zanin, and J. Zapatero
Subjects: Photon, galaxies: individual: draco, Astrophysics::High Energy Astrophysical Phenomena, Raigs còsmics, Dark matter, Flux, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, dark matter, galaxies: individual (Draco), Cosmic rays, Physics, Cosmology: Dark Matter, galaxies: dwarf, gamma rays: observations, Annihilation, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Galaxies, Dwarf spheroidal galaxy, Galàxies, Space and Planetary Science, Dark matter (Astronomy), Neutralino, Electrónica, Física nuclear, dark matter, galaxies: dwarf, galaxies: individual (Draco), gamma rays: observations, Matèria fosca (Astronomia), Electricidad
Abstract: The nearby dwarf spheroidal galaxy Draco with its high mass to light ratio is one of the most auspicious targets for indirect dark matter searches. Annihilation of hypothetical DM particles can result in high-energy gamma-rays, e.g. from neutralino annihilation in the supersymmetric framework. With the MAGIC telescope a search for a possible DM signal originating from Draco was performed during 2007. The analysis of the data results in a flux upper limit of 1.1x10^-11 photons cm^-2 sec^-1 for photon energies above 140 GeV, assuming a point like source. Furthermore, a comparison with predictions from supersymmetric models is given. While our results do not constrain the mSUGRA phase parameter space, a very high flux enhancement can be ruled out., Comment: Accepted for publication by Astrophysical Journal
Published: 2008

42. Magic observations of the unidentified gamma-ray source TEV J2032+4130

Author: J. Albert, E. Aliu, H. Anderhub, P. Antoranz, C. Baixeras, J. A. Barrio, H. Bartko, D. Bastieri, J. K. Becker, W. Bednarek, K. Berger, C. Bigongiari, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, V. Curtef, F. Dazzi, A. De Angelis, C. Delgado, R. de los Reyes, E. Domingo-Santamaría, B. De Lotto, M. De Maria, F. De Sabata, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García-López, M. Garczarczyk, M. Gaug, F. Goebel, M. Hayashida, A. Herrero, D. Höhne, J. Hose, C. C. Hsu, S. Huber, T. Jogler, R. Kosyra, D. Kranich, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, M. Mariotti, M. Martínez, D. Mazin, C. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, E. Oña-Wilhelmi, N. Otte, I. Oya, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. Pegna, M. Persic, L. Peruzzo, A. Piccioli, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, A. Sánchez, P. Sartori, V. Scalzotto, V. Scapin, R. Schmitt, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sillanpää, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, F. Zandanel, R. Zanin, J. Zapatero, 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), 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), 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, and 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)
Subjects: [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, 01 natural sciences, Power law, law.invention, Telescope, law, Observacions astronòmiques, Gamma ray astronomy, 0103 physical sciences, Astronomia de raigs gamma, MAGIC (telescope), 010303 astronomy & astrophysics, Physics, 010308 nuclear & particles physics, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics (astro-ph), Gamma ray, HEGRA, Astronomy and Astrophysics, Space and Planetary Science, High Energy Physics::Experiment, Electrónica, Física nuclear, Electricidad, Energy (signal processing), gamma rays: observations, Astronomical observations
Abstract: We observed the first known very high energy (VHE) gamma-ray emitting unidentified source, TeV J2032+4130, for 94 hours with the MAGIC telescope. The source was detected with a significance of 5.6 sigma. The flux, position, and angular extension are compatible with the previous ones measured by the HEGRA telescope system five years ago. The integral flux amounts to (4.5+-0.3stat+-0.35sys)x10^{-13} ph cm$^{-2}$ s$^{-1}$ above 1 TeV. The source energy spectrum, obtained with the lowest energy threshold to date, is compatible with a single power law with a hard photon index of Gamma=-2.0+-0.3stat+-0.2sys., 4 pages, 3 figures, accepted for publication in The Astrophysical Journal Letters. Corrected typos
Published: 2008

43. Periodic very high energy gamma-ray emission from LS I +61 303 observed with the MAGIC telescope

Author: J. Albert, E. Aliu, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, 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. Bordas, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, M. Errando, M. Fagiolini, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, M. Hayashida, A. Herrero, D. Höhne, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, N. Otte, I. Oya, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, A. Piccioli, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, 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. Sillanpää, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, M. Tluczykont, D. F. Torres, 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, Photon, individual (LS I +61◦303) [Stars], H-ALPHA, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Gamma rays: observations, 01 natural sciences, X-rays: binaries, SOURCE 2CG 135+01, X-RAY, MICROQUASAR LS-I+61-303, SPACED DATA, LSI+61-DEGREES-303, BINARY, RADIO, LS-I-+61-303, observations [Gamma rays], 0103 physical sciences, Energy spectrum, Gamma ray astronomy, X-rays, Astronomia de raigs gamma, MAGIC (telescope), Binary system, 010303 astronomy & astrophysics, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Light curve, Orbital period, Space and Planetary Science, Stars: individual (LS I +61◦303), binaries [X-rays], Raigs X
Abstract: The MAGIC collaboration has recently reported the discovery of gamma-ray emission from the binary system LS I +61 303 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 hours of data were taken between September and December 2006 covering 4 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 +61 303. In addition, we also obtained a differential energy spectrum for two orbital phase bins covering the phase range 0.5, Comment: 7 pages, 8 figures, submitted to ApJ
Published: 2008
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44. Implementation of the Random Forest method for the Imaging Atmospheric Cherenkov Telescope MAGIC

Author: A. Laille, M. Pasanen, R. de los Reyes, A. Armada, Nicola Turini, Manel Errando, M. Rissi, I. Britvitch, D. Kranich, A. Robert, J. Rico, Francesco Longo, W. Wittek, Jelena Ninkovic, L. Peruzzo, Florian Goebel, Daniela Dorner, H. Anderhub, M. I. Martínez, N. Sidro, Francesco Dazzi, M. Shayduk, R. Kritzer, D. Pascoli, A. Sillanpää, T. Schweizer, Riccardo Paoletti, A. Herrero, K. Shinozaki, Takashi Saito, P. Jacon, Mosè Mariotti, Masaaki Hayashida, A. Venturini, R. Kosyra, Robert Wagner, E. Fernandez, Jose Luis Contreras, G. Maneva, J. M. Paredes, Antonio Stamerra, A. Raymers, T. Jogler, V. Danielyan, D. Tescaro, B. De Lotto, Masahiro Teshima, Tadeusz Wibig, J. Hose, A. Saggion, Juan Cortina, D. Höhne, A. De Angelis, R. J. García-López, Adrian Biland, Petar Temnikov, A. Piccioli, Markus Gaug, R. Firpo, Nicola Galante, Daniel Ferenc, R. Pegna, H. Vankov, P. Majumdar, Julia Becker, S. Commichau, L. S. Stark, F. Pauss, H. Bartko, Roberta Zanin, Michele Doro, Stefano Ciprini, Daniel Nieto, P. Sartori, P. Antoranz, Jose Miguel Miranda, K. Nilsson, T. Hengstebeck, Saverio Lombardi, V. Vitale, C. Delgado, Denis Bastieri, K. Berger, E. Domingo-Santamaría, C. Baixeras, Valentí Bosch-Ramon, Alvaro Sanchez, Diego F. Torres, Ciro Bigongiari, E. Lorenz, V. Scapin, Maria Giller, M. Asensio, V. Curtef, E. Carmona, Felix Spanier, R. Schmitt, Jorge Andres Lopez Lopez, Mario Meucci, W. Bednarek, Jose Flix, V. Scalzotto, Abelardo Moralejo, L. O. Takalo, Ll. Font, M. V. Fonseca, Dorota Sobczyńska, F. Zandanel, Justin Albert, N. Otte, D. Hakobyan, S. Mizobuchi, Marc Ribó, M. T. Costado, R. K. Bock, Pol Bordas, K. Mannheim, Elisa Prandini, M. Meyer, M. Garczarczyk, C. C. Hsu, Ashot Chilingarian, Thomas Bretz, S. N. Shore, Michela Fagiolini, R. Mirzoyan, M. Panniello, M. Fuchs, Massimo Persic, J. Zapatero, Wolfgang Rhode, J. A. Coarasa, I. Oya, M. Camara, C. Merck, E. Aliu, E. Oña-Wilhelmi, N. Puchades, Elina Lindfors, Daniel Mazin, S. Rügamer, M. López, Juan Abel Barrio, and S. Huber
Subjects: Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Decision tree, FOS: Physical sciences, Astrophysics, law.invention, Nuclear physics, Telescope, law, GAMMA-RAY, SEPARATION, RADIATION, Instrumentation, Cherenkov radiation, Remote sensing, Physics, COSMIC cancer database, Astrophysics (astro-ph), Magic (programming), Gamma-ray astronomy, Random forest, Data analysis, Electrónica, Física nuclear, gamma ray astronomy, Electricidad
Abstract: The paper describes an application of the tree classification method Random Forest (RF), as used in the analysis of data from the ground-based gamma telescope MAGIC. In such telescopes, cosmic gamma-rays are observed and have to be discriminated against a dominating background of hadronic cosmic-ray particles. We describe the application of RF for this gamma/hadron separation. The RF method often shows superior performance in comparison with traditional semi-empirical techniques. Critical issues of the method and its implementation are discussed. An application of the RF method for estimation of a continuous parameter from related variables, rather than discrete classes, is also discussed., Comment: 16 pages, 8 figures
Published: 2008

45. Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?

Author: Elisa Prandini, Ashot Chilingarian, A. Herrero, Denis Bastieri, F. De Sabata, V. Scalzotto, A. Saggion, Adrian Biland, Victor Zabalza, K. Mannheim, E. De Cea del Pozo, Markus Gaug, Masahiro Teshima, A. Robert, Abelardo Moralejo, M. Garczarczyk, M. Rissi, M. Hayashida, J. K. Becker, Aaron Dominguez, Valentí Bosch-Ramon, S. Mizobuchi, Michela Fagiolini, D. Kranich, N. Mankuzhiyil, L. S. Stark, Stefano Covino, Juan Abel Barrio, Jose Luis Contreras, V. Vitale, C. C. Hsu, Juan Cortina, S. Commichau, R. J. García López, S. Huber, R. Pegna, Mario Meucci, M. Tluczykont, J. Zapatero, M. De Maria, Marc Ribó, I. Oya, Agnieszka Sierpowska-Bartosik, Daniel Ferenc, Florian Goebel, P. Antoranz, C. Delgado Mendez, T. Schweizer, Jelena Ninkovic, F. Pauss, H. Vankov, M. V. Fonseca, M. T. Costado, L. Maraschi, Massimo Persic, Jose Miguel Miranda, E. Aliu, Elina Lindfors, Diego F. Torres, Ciro Bigongiari, Steven N. Shore, P. Majumdar, Daniela Dorner, A. La Barbera, Dorota Sobczyńska, Daniel Mazin, Thomas Bretz, M. Camara, Alessio Venturini, S. Rügamer, Francesco Dazzi, Manel Errando, M. I. Martínez, P. Sartori, R. Mirzoyan, D. Pascoli, R. K. Bock, J. Hose, G. Bonnoli, B. De Lotto, Miguel A. Sánchez-Conde, Petar Temnikov, Robert Wagner, Elisa Bernardini, E. Fernandez, P. Bordas, E. Carmona, N. Sidro, M. Panniello, E. Leonardo, Fabio Zandanel, K. Shinozaki, K. Nilsson, G. Maneva, N. Otte, W. Bednarek, Wolfgang Rhode, R. Schmitt, C. Baixeras, Fabrizio Tavecchio, Roberta Zanin, M. López, Ll. Font, J. Rico, Konstancja Satalecka, Michele Doro, N. Puchades, T. Jogler, Miguel A. Pérez-Torres, L. Peruzzo, Mariano Moles, D. Höhne, I. Britvitch, Riccardo Paoletti, D. Tescaro, J. M. Paredes, Antonio Stamerra, J. Albert, R. Firpo, H. Bartko, A. Sillanpää, M. S. Meyer, Takashi Saito, E. Lorenz, M. Salvati, Francisco Prada, K. Berger, Mosè Mariotti, Felix Spanier, Francesco Longo, W. Wittek, A. Laille, Saverio Lombardi, M. Pasanen, R. de los Reyes, Nicola Turini, V. Scapin, V. Curtef, L. O. Takalo, H. Anderhub, Michael Backes, Daniel Nieto, M. Shayduk, A. Raymers, A. De Angelis, L. A. Antonelli, A. Piccioli, Nicola Galante, T. Kneiske, and Universitat de Barcelona
Subjects: Astrofísica, Astrophysics::High Energy Astrophysical Phenomena, Cosmic background radiation, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Space telescopes, law.invention, Telescope, Astroparticle, law, 0103 physical sciences, Gamma ray astronomy, Astronomia de raigs gamma, 010303 astronomy & astrophysics, Quasars, VHE Gamma ray, Cherenkov radiation, Astrophysics::Galaxy Astrophysics, Quàsars, Physics, Multidisciplinary, 010308 nuclear & particles physics, Astrophysics (astro-ph), Gamma ray, Astronomy, Quasar, Galaxy, Redshift, Cherenkov telescope, Extragalactic background light, 13. Climate action, Electrónica, Física nuclear, Electricidad, Telescopis espacials
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. Since 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., 9 pages, 6 figures, including Supporting Online Material
Published: 2008

46. Daedalus: A hardware signal analyser for Icarus

Author: M. Lippi, F. Pietropaolo, Sandro Ventura, G. Pratali, D. Pascoli, C. Carpanese, and S. Centro
Subjects: ICARUS, Physics, Very-large-scale integration, Nuclear and High Energy Physics, business.industry, Analyser, Detector, Signal, Sampling (signal processing), Detection theory, business, Instrumentation, Computer hardware, Communication channel
Abstract: Icarus detector [1] is a large-volume (400 cm) liquid Argon TPC that requires continuous high rate sampling signal recording on each channel (about 50 000) to produce event images quite similar to the ones from bubble chambers. In order to optimize the memory usage, a signal feature extractor, that commands memory writing only upon signal detection, has been designed in VLSI CMOS. ( 1998 Elsevier Science B.V. All rights reserved.
Published: 1998

47. Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303

Author: S. Lombardi, M. Rissi, Abelardo Moralejo, C. C. Hsu, F. Pauss, D. Kranich, J. Hose, Petar Temnikov, Stefano Ciprini, K. Mannheim, M. Meyer, M. Garczarczyk, Steven N. Shore, W. Bednarek, H. Bartko, Francesco Longo, W. Wittek, A. Sillanpää, Masaaki Hayashida, Manel Errando, Jose Flix, Ll. Font, Jose Luis Contreras, Juan Abel Barrio, Michela Fagiolini, Oriana Mansutti, P. Antoranz, K. Nilsson, M. Laatiaoui, Daniel Ferenc, V. Danielyan, Michele Doro, Juan Cortina, H. Vankov, R. Orduña, P. Majumdar, V. Scapin, R. Pegna, E. Oña-Wilhelmi, Valentí Bosch-Ramon, Paula Gina Isar, M. Shayduk, David Paneque, Thomas Bretz, Josep M. Paredes, A. Raymers, D. Tescaro, Tadeusz Wibig, R. Mirzoyan, E. Lorenz, L. Peruzzo, M. Bartelt, Florian Goebel, Maria Giller, A. De Angelis, A. Piccioli, D. Hakobyan, N. Otte, B. De Lotto, S. Mizobuchi, Nicola Galante, M. Poller, B. Riegel, Wolfgang Rhode, J. Rico, E. Carmona, Francesco Dazzi, Gustavo E. Romero, N. Tonello, D. Pascoli, M. Camara, N. Pavel, K. Berger, A. Armada, R. Kosyra, Robert Wagner, D. Höhne, Marc Ribó, J. Zapatero, T. Schweizer, A. Torres, K. Mase, P. Jacon, I. Oya, M. Asensio, V. Vitale, C. Merck, R. K. Bock, I. Britvitch, G. Maneva, R. Schmitt, Dorota Sobczyńska, A. Saggion, V. Scalzotto, Justin Albert, Diego F. Torres, Ciro Bigongiari, Adrian Biland, C. Baixeras, H. Anderhub, Mario Meucci, Masahiro Teshima, Markus Gaug, K. Shinozaki, E. Aliu, Elina Lindfors, A. Laille, F. Lucarelli, Daniel Mazin, L. S. Stark, M. Pasanen, S. Rügamer, A. Robert, P. Sartori, E. Domingo-Santamaría, R. de los Reyes, M. López, T. Lenisa, Nicola Turini, M. V. Fonseca, Denis Bastieri, M. I. Martínez, S. R. Bavikadi, Alvaro Sanchez, N. Sidro, R. Zanin, T. Hengstebeck, Pol Bordas, M. Fuchs, Massimo Persic, Josue J. Lopez, J. A. Coarasa, Riccardo Paoletti, P. Liebing, Antonio Stamerra, Elisa Prandini, E. Fernandez, Ashot Chilingarian, O. Kalekin, R. Firpo, Guy G. Pooley, E. Bisesi, S. Commichau, Jose Miguel Miranda, V. Curtef, L. O. Takalo, Mosè Mariotti, Daniela Dorner, Universitat de Barcelona, Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, D., Bavikadi, S. R., 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, 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., Isar, P. G., Jacon, P., Kalekin, O., Kosyra, R., Kranich, D., Laatiaoui, M., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Lombardi, S., Longo, Francesco, 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, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Oña Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., 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, G. E., 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., and Zapatero, J.
Subjects: Astrofísica, Ciencias Físicas, Raigs còsmics, orbital cycles, VHE Gamma ray, ATMOSPHERIC CHERENKOV TELESCOPE, Microquasar, QUASAR, Estels binaris, Astrophysics, LS I +61 303 (microcuásar), purl.org/becyt/ford/1 [https], Astrophysical jet, Microquasars, Jets (Astrofísica), Gamma ray astronomy, Radio astronomy, Absorption (electromagnetic radiation), Very High-energy Gamma-rays, Cherenkov tekescopes, Physics, Multidisciplinary, Astrophysics (astro-ph), Gamma ray, Radioastronomia, Electrónica, Física nuclear, Electricidad, CIENCIAS NATURALES Y EXACTAS, Astrophysics::High Energy Astrophysical Phenomena, Very High-energy Gamma-ray, Phase (waves), FOS: Physical sciences, microquasars, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Binary stars, Double stars, Binary star, Astronomia de raigs gamma, Quasars, Cosmic rays, Quàsars, Astrophysics::Galaxy Astrophysics, Astronomy, Quasar, purl.org/becyt/ford/1.3 [https], gamma-ray emission, Astrophysical jets, Astronomía, Stars
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., La lista completa de autores que integran el documento puede consultarse en el archivo., Facultad de Ciencias Astronómicas y Geofísicas, Instituto Argentino de Radioastronomía
Published: 2006

48. The Transputer Based GA.SP Data Acquisition System

Author: Alberto Negro, M. De Poli, Roberto Vicençotto Ribas, G. Maron, G. Parlati, D. Pascoli, B. D'Avanzo, D. Colombo, S. Scanferlato, and G. Vedovato
Subjects: Unix, Nuclear and High Energy Physics, ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, Workstation, Computer science, business.industry, Transputer, Detector, law.invention, Data acquisition, Nuclear Energy and Engineering, law, Histogram, Fiber Distributed Data Interface, Electrical and Electronic Engineering, business, Computer hardware, VMEbus
Abstract: A description of the new data acquisition system for the GA.SP detector is presented. It is distributed system based on a network of 40 T800 and T222 transputers linked to a VME system used for histogram storage. A 100 Mb/s FDDI ring connects the system to UNIX workstations used for the experiment control, histogram display, and second-level data analysis. >
Published: 2005

49. A Multiprocessor Based Language for Data Processing in Nuclear Physic Experiments

Author: M. De Poli, B. D'Avanzo, D. Colombo, G. Parlati, Alberto Negro, Roberto Vicençotto Ribas, D. Pascoli, G. Vedovato, S. Scanferlato, and G. Maron
Subjects: Data processing, Data acquisition, Computer science, Histogram, Multiprocessing, Parallel computing, Network topology
Published: 2005

50. Commissioning and first tests of the MAGIC telescope

Author: R. D. Reyes, Abelardo Moralejo, A. Laille, M. Gaug, V. Fonseca, Masahiro Teshima, R. K. Bock, R. Orduña, G. Blanchot, Nicola Turini, M. A. Lopez, Denis Bastieri, V. Scalzotto, M. Garczarczyk, Carles Domingo, E. Colombo, E. Domingo, Andrew D. Roberts, K. Mase, V. Vitale, Riccardo Paoletti, E. Oña Wilhelmi, R. G. Pegna, A. Sillanpää, Ashot Chilingarian, Tadeusz Wibig, Dorota Sobczyńska, Karl Mannheim, N. Pavel, W. Wittek, Daniel Ferenc, A. Torres, Ciro Bigongiari, O. C. de Jager, R. Stiehler, E. Lorenz, A. Saggion, E. Fernandez, P. Sartori, M. Merck, R. Mirzoyan, Mario Meucci, J. Gebauer, David Paneque, Antonio Stamerra, T. Schweizer, Oscar Blanch, J.C. Contreras, D. Corti, A. Stepanian, L. Miralles, L. O. Takalo, Florian Goebel, S. Volkov, O. Kalekin, Maria Giller, Jose Flix, Ll. Font, T. Hengstebeck, M. Martinez, A. Piccioli, Juan Cortina, N. Tonello, Mosè Mariotti, Robert Wagner, Nicola Galante, T. Kneiske, M. Kestel, Thomas Bretz, P. Jacone, C. Baixeras, A. Sánchez, Josue J. Lopez, J. A. Coarasa, L. Peruzzo, and D. Pascoli
Subjects: Astroparticle physics, Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Cherenkov telescopes, Gamma ray astronomy, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Cosmic ray, X-ray telescope, Gamma-ray astronomy, Cherenkov Telescope Array, Particle detector, law.invention, Telescope, law, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Instrumentation, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: Major Atmospheric Gamma Imaging Cherenkov telescope is starting its operations with a set of engineering runs to tune the telescope subsystem elements to be ready for the first physics campaign. Many technical improvements have been developed and implemented in several elements of the telescope to reach the lowest energy threshold ever obtained by an Imaging Atmospheric Cherenkov Telescope. A general description of the telescope is presented. The commissioning of the telescope's elements is described and the expected performances are reviewed with the final detector set-up.
Published: 2004

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