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1. THE 2009 DECEMBER GAMMA-RAY FLARE OF 3C 454.3: THE MULTIFREQUENCY CAMPAIGN

Author

L. Salotti, E. Moretti, Mark Gurwell, C. Pittori, M. Tavani, S. Vercellone, V. Vittorini, F. Longo, T. Sakamoto, Martino Marisaldi, A. Morselli, M. Galli, P. Santolamazza, G. Barbiellini P. Caraveo, Elena Pian, C. M. Raiteri, M. Pilia, Francesco Lucarelli, A. Trois, A. Rubini, F. D'Ammando, F. Verrecchia, Michael C. Stroh, M. Prest, F. Perotti, Andrea Tiengo, E. Vallazza, P. W. Cattaneo, M. Feroci, Merja Tornikoski, M. Villata, L. Pacciani, P. Picozza, A. Pellizzoni, E. Costa, E. Del Monte, A. Rappoldi, M. Fiorini, Ryosuke Itoh, P. A. Curran, Masayuki Yamanaka, G. Pucella, F. Lazzarotto, Valeri M. Larionov, C. S. Lin, F. Gianotti, A. C. Sadun, A. Giuliani, V. Cocco, Arnaud Ferrari, P. Lipari, M. Trifoglio, M. Fiocchi, E. Morelli, Andrei Berdyugin, G. Piano, H. A. Krimm, Sandro Mereghetti, L. O. Takalo, A. D. Falcone, S. Colafrancesco, Claudio Labanti, D. Zanello, F. Fuschino, D. Fugazza, G. Di Cocco, M. Rapisarda, A. Argan, Andrea Bulgarelli, Makoto Uemura, P. Giommi, Anne Lähteenmäki, G. De Paris, I. Donnarumma, Y. Evangelista, P. Soffitta, A. W. Chen, Paolo Leto, Hugh D. Aller, E. Striani, Mahito Sasada, I. Lapshov, M. F. Aller, S. Sabatini, Pacciani L, Vittorini V, Tavani M, Fiocchi MT, Vercellone S, DAmmando F, Sakamoto T, Pian E, Raiteri CM, Villata M, Sasada M, Itoh R, Yamanaka M, Uemura M, Striani E, Fugazza D, Tiengo A, Krimm HA, Stroh MC, Falcone AD, Curran PA, Sadun AC, Lahteenmaki A, Tornikoski M, Aller HD, Aller MF, Lin CS, Larionov VM, Leto P, Takalo LO, Berdyugin A, Gurwell MA, Bulgarelli A, Chen AW, Donnarumma I, Giuliani A, Longo F, Pucella G, Argan A, Barbiellini G, Caraveo P, Cattaneo PW, Costa E, De Paris G, Del Monte E, Di Cocco G, Evangelista Y, Ferrari A, Feroci M, Fiorini M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mereghetti S, Morelli E, Moretti E, Morselli A, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Prest M, Rapisarda M, Rappoldi A, Rubini A, Sabatini S, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zanello D, Colafrancesco S, Pittori C, Verrecchia F, Santolamazza P, Lucarelli F, Giommi P, Salotti L, L., Pacciani, V., Vittorini, M., Tavani, M. T., Fiocchi, S., Vercellone, F., D'Ammando, T., Sakamoto, E., Pian, C. M., Raiteri, M., Villata, M., Sasada, R., Itoh, M., Yamanaka, M., Uemura, E., Striani, D., Fugazza, A., Tiengo, H. A., Krimm, M. C., Stroh, A. D., Falcone, P. A., Curran, A. C., Sadun, A., Lahteenmaki, M., Tornikoski, H. D., Aller, M. F., Aller, C. S., Lin, V. M., Larionov, P., Leto, L. O., Takalo, A., Berdyugin, M. A., Gurwell, A., Bulgarelli, A. W., Chen, I., Donnarumma, A., Giuliani, Longo, Francesco, G., Pucella, A., Argan, G., Barbiellini, P., Caraveo, P. W., Cattaneo, E., Costa, G. D., Pari, E. D., Monte, G. D., Cocco, Y., Evangelista, A., Ferrari, M., Feroci, M., Fiorini, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, S., Mereghetti, E., Morelli, E., Moretti, A., Morselli, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, S., Sabatini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, D., Zanello, S., Colafrancesco, C., Pittori, F., Verrecchia, P., Santolamazza, F., Lucarelli, P., Giommi, and L., Salotti

Subjects
Agile, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, galaxies: active, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, gamma-ray source, High Energy Gamma-ray Astronomy, AGILE satellite, Active Galactic Nuclei, Spectral line, blazar, law.invention, Accretion disc, multi wavelength observation, law, quasars: general, Blazar, media_common, Physics, galaxies: individual (3C 454.3), Gamma ray, Astronomy and Astrophysics, radiation mechanisms: non-thermal, Wavelength, Space and Planetary Science, Sky, Flare
Abstract

During the month of 2009 December, the blazar 3C 454.3 became the brightest gamma-ray source in the sky, reaching a peak flux F 2000 × 10 -8 photons cm-2 s-1 for E > 100 MeV. Starting in 2009 November intensive multifrequency campaigns monitored the 3C 454 gamma-ray outburst. Here, we report on the results of a two-month campaign involving AGILE, INTEGRAL, Swift/XRT, Swift/BAT, and Rossi XTE for the high-energy observations and Swift/UVOT, KANATA, Goddard Robotic Telescope, and REM for the near-IR/optical/UV data. GASP/WEBT provided radio and additional optical data. We detected a long-term active emission phase lasting 1 month at all wavelengths: in the gamma-ray band, peak emission was reached on 2009 December 2-3. Remarkably, this gamma-ray super-flare was not accompanied by correspondingly intense emission in the optical/UV band that reached a level substantially lower than the previous observations in 2007-2008. The lack of strong simultaneous optical brightening during the super-flare and the determination of the broadband spectral evolution severely constrain the theoretical modeling. We find that the pre- and post-flare broadband behavior can be explained by a one-zone model involving synchrotron self-Compton plus external Compton emission from an accretion disk and a broad-line region. However, the spectra of the 2009 December 2-3 super-flare and of the secondary peak emission on 2009 December 9 cannot be satisfactorily modeled by a simple one-zone model. An additional particle component is most likely active during these states. © 2010. The American Astronomical Society. All rights reserved.

Published
2010
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2. Long-term AGILE monitoring of the puzzling gamma-ray source 3EG J1835+5918

Author

G. De Paris, A. Zambra, F. D'Ammando, M. Feroci, M. Fiorini, Dario Gasparrini, L. Pacciani, F. Longo, A. Rappoldi, E. Vallazza, F. Boffelli, M. Rapisarda, P. Picozza, A. Argan, F. Perotti, E. Del Monte, G. Pucella, A. Trois, Andrea Bulgarelli, I. Donnarumma, T. Froysland, P. Soffitta, A. Pellizzoni, Guido Barbiellini, Enrico Costa, Y. Evangelista, F. Lazzarotto, V. Vittorini, V. Cocco, P. Santolamazza, M. Trifoglio, A. Giuliani, Paolo Lipari, A. W. Chen, P. Giommi, F. Fuschino, S. Vercellone, C. Pittoril, M. Galli, F. Verrecchia, Martino Marisaldi, Sandro Mereghetti, P. W. Cattaneo, P. A. Caraveo, I. Lapshov, M. Prest, S. Colafrancesco, Marco Tavani, G. Piano, A. Morselli, Claudio Labanti, L. Salotti, D. Zanello, M. Marelli, G. Di Cocco, S. Cutini, Fulvio Gianotti, Bulgarelli A, Tavani M, Caraveo P, Chen AW, Gianotti F, Trifoglio M, Marelli M, Argan A, Barbiellini G, Boffelli F, Cattaneo PW, Cocco V, Costa E, DAmmando F, Del Monte E, De Paris G, Di Cocco G, Donnarumma I, Evangelista Y, Feroci M, Fiorini M, Froysland T, Fuschino F, Galli M, Giuliani A, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mereghetti S, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Piano G, Picozza P, Prest M, Pucella G, Rapisarda M, Rappoldi A, Soffitta P, Trois A, Vallazza E, Vercellone S, Vittorini V, Zambra A, Zanello D, Giommi P, Pittori C, Verrecchia F, Santolamazza P, Gasparrini D, Cutini S, Colafrancesco S, Salotti L, A., Bulgarelli, M., Tavani, P., Caraveo, A. W., Chen, F., Gianotti, M., Trifoglio, M., Marelli, A., Argan, G., Barbiellini, F., Boffelli, P. W., Cattaneo, V., Cocco, E., Costa, F., D'Ammando, E. D., Monte, G. D., Pari, G. D., Cocco, I., Donnarumma, Y., Evangelista, M., Feroci, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, A., Giuliani, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Prest, G., Pucella, M., Rapisarda, A., Rappoldi, P., Soffitta, A., Troi, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, D., Zanello, P., Giommi, C., Pittori, F., Verrecchia, P., Santolamazza, D., Gasparrini, S., Cutini, S., Colafrancesco, and L., Salotti

Subjects
Photon, Field (physics), FOS: Physical sciences, Flux, Field of view, Astrophysics, Unidentified Gamma-ray Source, Power law, High Energy Gamma-ray Astronomy, AGILE gamma ray satellite, 3EG J1835+5918, Egret, Physics, biology, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, biology.organism_classification, Term (time), Space and Planetary Science, Unidentified Gamma-ray Sources, AGILE satellite, gamma rays: observations
Abstract

We present the AGILE gamma-ray observations of the field containing the puzzling gamma-ray source 3EG J1835+5918. This source is one of the most remarkable unidentified EGRET sources. An unprecedentedly long AGILE monitoring of this source yields important information on the positional error box, flux evolution, and spectrum. 3EG J1835+5918 has been in the AGILE field of view several times in 2007 and 2008 for a total observing time of 138 days from 2007 Sept 04 to 2008 June 30 encompassing several weeks of continuous coverage. With an exposure time approximately twice that of EGRET, AGILE confirms the existence of a prominent gamma-ray source (AGL J1836+5926) at a position consistent with that of EGRET, although with a remarkably lower average flux value for photon energies greater than 100 MeV. A 5-day bin temporal analysis of the whole data set of AGL J1836+5926 shows some evidence for variability of the gamma-ray flux. The source spectrum between 100 MeV and 1 GeV can be fitted with a power law with photon index in the range 1.6-1.7, fully consistent with the EGRET value. The faint X-ray source RX J1836.2+5925 that has been proposed as a possible counterpart of 3EG J1835+5918 is well within the AGILE error box. Future continuous monitoring (both by AGILE and GLAST) is needed to confirm the gamma-ray flux variability and to unveil the source origin, a subject that is currently being pursued through a multiwavelength search for counterparts., Comment: accepted for publication by Astron. & Astrophys, 4 pages, 2 figures, 2 tables

Published
2008
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3. AGILE Detection of a Strong Gamma-Ray Flare from the Blazar 3C 454.3

Author

T. Froysland, Martino Marisaldi, G. De Paris, Dario Gasparrini, Fulvio Gianotti, F. Perotti, F. Mauri, L. Salotti, A. Zambra, M. Prest, S. Cutini, Francesco Longo, G. Di Cocco, Paolo Giommi, Francesco Lazzarotto, M. Galli, Piergiorgio Picozza, Paolo Soffitta, F. Verrecchia, Marco Tavani, A. Pellizzoni, D. Zanello, Massimo Rapisarda, Claudio Labanti, Alessio Trois, Sergio Colafrancesco, L. A. Antonelli, P. A. Caraveo, Sandro Mereghetti, A. Giuliani, S. Vercellone, M. Fiorini, I. Donnarumma, Guido Barbiellini, A. Morselli, F. D'Ammando, Y. Evangelista, Marco Feroci, Luigi Pacciani, Paolo Lipari, E. Vallazza, F. Fuschino, V. Cocco, V. Vittorini, E. Del Monte, M. Trifoglio, G. Pucella, I. Lapshov, A. Argan, Andrea Bulgarelli, Enrico Costa, A. W. Chen, C. Pittori, S., Vercellone, A. W., Chen, A., Giuliani, A., Bulgarelli, I., Donnarumma, I., Lapshov, M., Tavani, A., Argan, G., Barbiellini, P., Caraveo, V., Cocco, E., Costa, F., D'Ammando, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, F., Mauri, S., Mereghetti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, P., Picozza, M., Prest, G., Pucella, M., Rapisarda, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, V., Vittorini, A., Zambra, D., Zanello, C., Pittori, F., Verrecchia, D., Gasparrini, S., Cutini, P., Giommi, L. A., Antonelli, S., Colafrancesco, L., Salotti, Vercellone S, Chen AW, Giuliani A, Bulgarelli A, Donnarumma I, Lapshov I, Tavani M, Argan A, Barbiellini G, Caraveo P, Cocco V, Costa E, DAmmando F, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, Fiorini M, Froysland T, Fuschino F, Galli M, Gianotti F, Labanti C, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mauri F, Mereghetti S, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Picozza P, Prest M, Pucella G, Rapisarda M, Soffitta P, Trifoglio M, Trois A, Vallazza E, Vittorini V, Zambra A, Zanello D, Pittori C, Verrecchia F, Gasparrini D, Cutini S, Giommi P, Antonelli LA, Colafrancesco S, and Salotti L

Subjects
High Energy Gamma-ray Astronomy, Active Galactic Nuclei, AGILE satellite, Agile, Photon, blazar, gamma and X-ray detection, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, law.invention, astro-ph, law, Blazar, Physics, Range (particle radiation), Astrophysics (astro-ph), Detector, Gamma ray, Astronomy and Astrophysics, Quasar, Space and Planetary Science, gamma rays: observations — quasars: individual (3C 454.3), Energy (signal processing), Flare
Abstract

We report the first blazar detection by the AGILE satellite. AGILE detected 3C 454.3 during a period of strongly enhanced optical emission in July 2007. AGILE observed the source with a dedicated repointing during the period 2007 July 24-30 with its two co-aligned imagers, the Gamma-Ray Imaging Detector and the hard X-ray imager Super-AGILE sensitive in the 30 MeV-50 GeV and 18-60 keV, respectively. Over the entire period, AGILE detected gamma-ray emission from 3C 454.3 at a significance level of 13.8-$\sigma$ with an average flux (E$>$100 MeV) of $(280 \pm 40) \times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. The gamma-ray flux appears to be variable towards the end of the observation. No emission was detected by Super-AGILE in the energy range 20-60 keV, with a 3-$\sigma$ upper limit of $2.3 \times 10^{-3}$ photons cm$^{-2}$ s$^{-1}$. The gamma-ray flux level of 3C 454.3 detected by AGILE is the highest ever detected for this quasar and among the most intense gamma-ray fluxes ever detected from Flat Spectrum Radio Quasars., Comment: Accepted by Astrophysical Journal Letters; 14 pages, 3 EPS Figures, 1 Table

Published
2008
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4. Direct Evidence for Hadronic Cosmic-Ray Acceleration in the Supernova Renmant IC 443

Author

C. Pittori, Marco Feroci, F. Fuschino, Luigi Pacciani, Paolo Soffitta, G. De Paris, A. Giuliani, E. Scalise, Filippo D'Ammando, V. Cocco, M. Mastropietro, E. Del Monte, V. Vittorini, Arnaud Ferrari, Paolo Lipari, M. Trifoglio, Y. Evangelista, S. Vercellone, F. Perotti, Francesco Lazzarotto, P. Santolamazza, A. Zambra, A. Pellizzoni, G. Di Cocco, E. Striani, I. Lapshov, Fulvio Gianotti, I. Donnarumma, Martino Marisaldi, L. Salotti, Elena Moretti, Alda Rubini, P. W. Cattaneo, A. Rappoldi, A. W. Chen, P. Picozza, P. Giommi, Massimo Rapisarda, G. Pucella, F. Longo, D. Zanello, A. Argan, Andrea Bulgarelli, T. Contessi, Enrico Costa, Claudio Labanti, L. A. Antonelli, G. Piano, P. A. Caraveo, M. Galli, F. Verrecchia, Sandro Mereghetti, A. Morselli, S. Colafrancesco, M. Prest, Alessio Trois, M. Pilia, Marco Tavani, S. Sabatini, Ennio Morelli, G. Barbiellini, E. Vallazza, M., Tavani, A., Giuliani, A. W., Chen, A., Argan, G., Barbiellini, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, V., Cocco, T., Contessi, F., D'Ammando, E., Costa, G. D., Pari, E. D., Monte, G. D., Cocco, I., Donnarumma, Y., Evangelista, A., Ferrari, M., Feroci, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Morelli, E., Moretti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, G., Pucella, M., Prest, M., Rapisarda, A., Rappoldi, E., Scalise, A., Rubini, S., Sabatini, E., Striani, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, D., Zanello, C., Pittori, F., Verrecchia, P., Santolamazza, P., Giommi, S., Colafrancesco, L. A., Antonelli, L., Salotti, Tavani M, Giuliani A, Chen AW, Argan A, Barbiellini G, Bulgarelli A, Caraveo P, Cattaneo PW, Cocco V, Contessi T, DAmmando F, Costa E, De Paris G, Del Monte E, Di Cocco G, Donnarumma I, Evangelista Y, Ferrari A, Feroci M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mastropietro M, Mereghetti S, Morelli E, Moretti E, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Pucella G, Prest M, Rapisarda M, Rappoldi A, Scalise E, Rubini A, Sabatini S, Striani E, Soffitta P, Trifoglio M, Trois A, Vallazza E, Vercellone S, Vittorini V, Zambra A, Zanello D, Pittori C, Verrecchia F, Santolamazza P, Giommi P, Colafrancesco S, Antonelli LA, and Salotti L

Subjects
Agile, Photon, Supernova Remnants, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Cosmic ray, Electron, Astrophysics, High Energy Gamma-ray Astronomy, gamma ray production, supernova, Supernova remnant, Astrophysics::Galaxy Astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Molecular cloud, AGILE satellite, Gamma ray, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Supernova, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics - High Energy Astrophysical Phenomena, cosmic rays – gamma rays: general – ISM: supernova remnants – supernovae: general – supernovae: individual (IC 443)
Abstract

The Supernova Remnant (SNR) IC 443 is an intermediate-age remnant well known for its radio, optical, X-ray and gamma-ray energy emissions. In this Letter we study the gamma-ray emission above 100 MeV from IC 443 as obtained by the AGILE satellite. A distinct pattern of diffuse emission in the energy range 100 MeV-3 GeV is detected across the SNR with its prominent maximum (source "A") localized in the Northeastern shell with a flux F = (47 \pm 10) 10^{-8} photons cm^{-2} s^{-1} above 100 MeV. This location is the site of the strongest shock interaction between the SNR blast wave and the dense circumstellar medium. Source "A" is not coincident with the TeV source located 0.4 degree away and associated with a dense molecular cloud complex in the SNR central region. From our observations, and from the lack of detectable diffuse TeV emission from its Northeastern rim, we demonstrate that electrons cannot be the main emitters of gamma-rays in the range 0.1-10 GeV at the site of the strongest SNR shock. The intensity, spectral characteristics, and location of the most prominent gamma-ray emission together with the absence of co-spatial detectable TeV emission are consistent only with a hadronic model of cosmic-ray acceleration in the SNR. A high-density molecular cloud (cloud "E") provides a remarkable "target" for nucleonic interactions of accelerated hadrons: our results show enhanced gamma-ray production near the molecular cloud/shocked shell interaction site. IC 443 provides the first unambiguous evidence of cosmic-ray acceleration by SNRs., Comment: 5 pages, 2 figures; accepted by ApJLetters on Jan 21, 2010

Published
2010
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5. A year-long AGILE observation of Cygnus X-1 in hard spectral state

Author

A. W. Chen, Francesco Lazzarotto, A. Morselli, Marco Feroci, Luigi Pacciani, E. Striani, S. Vercellone, M. Prest, C. Pittori, I. Lapshov, I. Donnarumma, E. Del Monte, Sandro Mereghetti, A. Argan, M. Galli, P. W. Cattaneo, Piergiorgio Picozza, Massimo Rapisarda, F. Fuschino, Andrea Bulgarelli, F. Perotti, A. Pellizzoni, G. Di Cocco, F. Verrecchia, Enrico Costa, Elena Moretti, Filippo D'Ammando, G. Piano, A. Rappoldi, E. Vallazza, S. Cutini, A. Giuliani, P. A. Caraveo, L. Salotti, Paolo Soffitta, Claudio Labanti, A. Zambra, Francesco Longo, L. A. Antonelli, Guido Barbiellini, Martino Marisaldi, Paolo Lipari, P. Santolamazza, Paolo Giommi, Marco Tavani, S. Sabatini, V. Vittorini, M. Trifoglio, Maura Pilia, Alessio Trois, Fulvio Gianotti, B. Preger, F. Boffelli, Y. Evangelista, G. Pucella, Del Monte E, Feroci M, Evangelista Y, Costa E, Donnarumma I, Lapshov I, Lazzarotto F, Pacciani L, Rapisarda M, Soffitta P, Argan A, Barbiellini G, Boffelli F, Bulgarelli A, Caraveo P, Cattaneo PW, Chen A, DAmmando F, Di Cocco G, Fuschino F, Galli M, Gianotti F, Giuliani A, Labanti C, Lipari P, Longo F, Marisaldi M, Mereghetti S, Moretti E, Morselli A, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Prest M, Pucella G, Rappoldi A, Sabatini S, Striani E, Tavani M, Trifoglio M, Trois A, Vallazza E, Vercellone S, Vittorini V, Zambra A, Antonelli LA, Cutini S, Pittori C, Preger B, Santolamazza P, Verrecchia F, Giommi P, Salotti L, E. D., Monte, M., Feroci, Y., Evangelista, E., Costa, I., Donnarumma, I., Lapshov, F., Lazzarotto, L., Pacciani, M., Rapisarda, P., Soffitta, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A., Chen, F., D'Ammando, G. D., Cocco, F., Fuschino, M., Galli, F., Gianotti, A., Giuliani, C., Labanti, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, E., Moretti, A., Morselli, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, M., Prest, G., Pucella, A., Rappoldi, S., Sabatini, E., Striani, M., Tavani, M., Trifoglio, A., Troi, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, L. A., Antonelli, S., Cutini, C., Pittori, B., Preger, P., Santolamazza, F., Verrecchia, P., Giommi, and L., Salotti

Subjects
Agile, Black Holes, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Phase (waves), Flux, FOS: Physical sciences, Astrophysics, cignus, High Energy Gamma-ray Astronomy, X-ray, binaries, silicon detector, Range (statistics), Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Autocorrelation, Gamma ray, Static timing analysis, Astronomy and Astrophysics, stars: individual: Cyg X-1, gamma rays: observations, X-rays: binaries, X-rays: general, Space and Planetary Science, AGILE satellite, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract

We present the observation of Cyg X-1 in hard spectral state performed during the AGILE Science Verification Phase and Observing Cycle 1 in hard X-rays (with SuperAGILE) and gamma rays (with the GRID) and lasting for about 160 days with a live time of $\sim 6$ Ms. We investigate the variability of Cyg X-1 in hard X-rays at different timescales, from $\sim 300$ s up to one day, and we apply different tools of timing analysis, such as the autocorrelation function, the first order structure function and the Lomb-Scargle periodogram, to our data (from SuperAGILE) and to the simultaneous data in soft X-rays (from RXTE/ASM). We conclude our investigation with a search for emission in the energy range above 100 MeV with the maximum likelihood technique. In the hard X-ray band the flux of Cyg X-1 shows its typical erratic fluctuations at all timescales with variations of about a factor of two that do not affect significantly the shape of the energy spectrum. From the first order structure function we find that the X-ray emission of Cyg X-1 is characterized by \textit{antipersistence}, indication of a negative feedback mechanism at work. In the gamma ray data a statistically significant point-like source at the position of Cyg X-1 is not found and the upper limit on the flux is $\mathrm{5 \times 10^{-8} \; ph \; cm^{-2} \; s^{-1}}$, over the whole observation (160 days). Finally we compare our upper limit in gamma rays with the expectation of various models of the Cyg X-1 emission, of both hadronic and leptonic origin, in the GeV -- TeV band. The time history of Cyg X-1 in the hard X-ray band over 13 months (not continuous) is shown. Different tools of analysis do not provide fully converging results of the characteristic timescales in the system, suggesting that the timescales found in the structure function are not intrinsic to the physics of the source., Comment: 15 pages and 11 figures (with subfigures). Accepted for publication by A&A.

Published
2010

6. AGILE OBSERVATIONS OF THE 'SOFT' GAMMA-RAY PULSAR PSR B1509-58

Author

A. Argan, Andrea Bulgarelli, Enrico Costa, G. De Paris, F. Perotti, Patrick Weltevrede, Simon Johnston, A. Giuliani, A. Morselli, I. Donnarumma, A. Rappoldi, E. Vallazza, G. Pucella, V. Cocco, Claudio Labanti, A. W. Chen, C. Pittori, T. Froysland, E. Del Monte, A. Pellizzoni, Francesco Lazzarotto, Massimiliano Fiorini, N. D'Amico, S. Sabatini, Y. Evangelista, Francesco Longo, Andrea Possenti, G. Di Cocco, Paolo Lipari, F. Lucarelli, Giovanni F. Bignami, Marco Feroci, L. Salotti, F. Fuschino, Luigi Pacciani, D. Zanello, A. Zambra, S. Vercellone, M. Burgay, V. Vittorini, Filippo D'Ammando, Paolo Soffitta, M. Trifoglio, Massimo Rapisarda, Guido Barbiellini, P. Santolamazza, Maura Pilia, Alessio Trois, Paolo Giommi, I. Lapshov, Paolo Esposito, Fulvio Gianotti, M. Prest, A. De Luca, P. A. Caraveo, M. Galli, Piergiorgio Picozza, F. Verrecchia, G. Piano, Marco Tavani, Martino Marisaldi, Sandro Mereghetti, P. W. Cattaneo, Pilia M, Pellizzoni A, Trois A, Verrecchia F, Esposito P, Weltevrede P, Johnston S, Burgay M, Possenti A, Del Monte E, Fuschino F, Santolamazza P, Chen A, Giuliani A, Caraveo P, Mereghetti S, Tavani M, Argan A, Costa E, D'Amico N, De Luca A, Evangelista Y, Feroci M, Longo F, Marisaldi M, Barbiellini G, Bulgarelli A, Cattaneo PW, Cocco V, DAmmando F, De Paris G, Di Cocco G, Donnarumma I, Fiorini M, Froysland T, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Morselli A, Pacciani L, Perotti F, Piano G, Picozza P, Prest M, Pucella G, Rapisarda M, Rappoldi A, Sabatini S, Soffitta P, Trifoglio M, Vallazza E, Vercellone S, Vittorini V, Zambra A, Zanello D, Pittori C, Lucarelli F, Giommi P, Salotti L, Bignami GF, M., Pilia, A., Pellizzoni, A., Troi, F., Verrecchia, P., Esposito, P., Weltevrede, S., Johnston, M., Burgay, A., Possenti, E. D., Monte, F., Fuschino, P., Santolamazza, A., Chen, A., Giuliani, P., Caraveo, S., Mereghetti, M., Tavani, A., Argan, E., Costa, N., D'Amico, A. D., Luca, Y., Evangelista, M., Feroci, Longo, Francesco, M., Marisaldi, G., Barbiellini, A., Bulgarelli, P. W., Cattaneo, V., Cocco, F., D'Ammando, G. D., Pari, G. D., Cocco, I., Donnarumma, M., Fiorini, T., Froysland, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, A., Morselli, L., Pacciani, F., Perotti, G., Piano, P., Picozza, M., Prest, G., Pucella, M., Rapisarda, A., Rappoldi, S., Sabatini, P., Soffitta, M., Trifoglio, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, D., Zanello, C., Pittori, F., Lucarelli, P., Giommi, L., Salotti, and G. F., Bignami

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Agile, pulsar, gamma ray, High Energy Gamma-ray Astronomy, AGILE satellite, Pulsar, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, FOS: Physical sciences, gamma rays: stars – pulsars: general – pulsars: individual (PSR J1513–5908 (B1509–58)) – stars: neutron, Astronomy and Astrophysics, Astrophysics, Light curve, Electromagnetic radiation, Spectral line, Neutron star, Pair production, Space and Planetary Science, Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the results of new Agile observations of PSR B1509-58 performed over a period of 2.5 years following the detection obtained with a subset of the present data. The modulation significance of the lightcurve above 30 MeV is at a 5$\sigma$ confidence level and the lightcurve is similar to those found earlier by Comptel up to 30 MeV: a broad asymmetric first peak reaching its maximum 0.39 +/- 0.02 cycles after the radio peak plus a second peak at 0.94 +/- 0.03. The gamma-ray spectral energy distribution of the pulsed flux detected by Comptel and Agile is well described by a power-law (photon index alpha=1.87+/-0.09) with a remarkable cutoff at E_c=81 +/- 20 MeV, representing the softest spectrum observed among gamma-ray pulsars so far. The pulsar luminosity at E > 1 MeV is $L_{\gamma}=4.2^{+0.5}_{-0.2} \times10^{35}$ erg/s, assuming a distance of 5.2 kpc, which implies a spin-down conversion efficiency to gamma-rays of $\sim 0.03$. The unusual soft break in the spectrum of PSR B1509-58 has been interpreted in the framework of polar cap models as a signature of the exotic photon splitting process in the strong magnetic field of this pulsar. In this interpretation our spectrum constrains the magnetic altitude of the emission point(s) at 3 km above the neutron star surface, implying that the attenuation may not be as strong as formerly suggested because pair production can substitute photon splitting in regions of the magnetosphere where the magnetic field becomes too low to sustain photon splitting. In the case of an outer-gap scenario, or the two pole caustic model, better constraints on the geometry of the emission would be needed from the radio band in order to establish whether the conditions required by the models to reproduce Agile lightcurves and spectra match the polarization measurements., Comment: 17 pages, 2 figures, accepted for publication in ApJ

Published
2010

7. The Extraordinary Gamma-Ray Flare Of The Blazar 3c 454.3

Author

E. Striani, S. Vercellone, M. Tavani, V. Vittorini, F. D’Ammando, I. Donnarumma, L. Pacciani, G. Pucella, A. Bulgarelli, M. Trifoglio, F. Gianotti, P. Giommi, A. Argan, G. Barbiellini, P. Caraveo, P. W. Cattaneo, A. W. Chen, E. Costa, G. De Paris, E. Del Monte, G. Di Cocco, Y. Evangelista, M. Feroci, A. Ferrari, M. Fiorini, F. Fuschino, M. Galli, A. Giuliani, M. Giusti, C. Labanti, F. Lazzarotto, P. Lipari, F. Longo, M. Marisaldi, S. Mereghetti, E. Morelli, E. Moretti, A. Morselli, A. Pellizzoni, F. Perotti, G. Piano, P. Picozza, M. Pilia, M. Prest, M. Rapisarda, A. Rappoldi, S. Sabatini, E. Scalise, P. Soffitta, A. Trois, E. Vallazza, A. Zambra, D. Zanello, C. Pittori, F. Verrecchia, P. Santolamazza, F. Lucarelli, S. Colafrancesco, L. A. Antonelli, L. Salotti, E., Striani, S., Vercellone, M., Tavani, V., Vittorini, F., D'Ammando, I., Donnarumma, L., Pacciani, G., Pucella, A., Bulgarelli, M., Trifoglio, F., Gianotti, P., Giommi, A., Argan, G., Barbiellini, P., Caraveo, P. W., Cattaneo, A. W., Chen, E., Costa, G. D., Pari, E. D., Monte, G. D., Cocco, Y., Evangelista, M., Feroci, A., Ferrari, M., Fiorini, F., Fuschino, M., Galli, A., Giuliani, M., Giusti, C., Labanti, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, E., Morelli, E., Moretti, A., Morselli, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, M., Prest, M., Rapisarda, A., Rappoldi, S., Sabatini, E., Scalise, P., Soffitta, A., Troi, E., Vallazza, A., Zambra, D., Zanello, C., Pittori, F., Verrecchia, P., Santolamazza, F., Lucarelli, S., Colafrancesco, L. A., Antonelli, L., Salotti, Striani E, Vercellone S, Tavani M, Vittorini V, DAmmando F, Donnarumma I, Pacciani L, Pucella G, Bulgarelli A, Trifoglio M, Gianotti F, Giommi P, Argan A, Barbiellini G, Caraveo P, Cattaneo PW, Chen AW, Costa E, De Paris G, Del Monte E, Di Cocco G, Evangelista Y, Feroci M, Ferrari A, Fiorini M, Fuschino F, Galli M, Giuliani A, Giusti M, Labanti C, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mereghetti S, Morelli E, Moretti E, Morselli A, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Prest M, Rapisarda M, Rappoldi A, Sabatini S, Scalise E, Soffitta P, Trois A, Vallazza E, Zambra A, Zanello D, Pittori C, Verrecchia F, Santolamazza P, Lucarelli F, Colafrancesco S, Antonelli LA, and Salotti L

Subjects
Agile, Cosmology and Nongalactic Astrophysics (astro-ph.CO), blazar, gamma detection, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Type (model theory), Vela, High Energy Gamma-ray Astronomy, AGILE satellite, Active Galactic Nuclei, law.invention, Pulsar, law, Blazar, Physics, gamma rays: galaxies – quasars: individual (3C 454.3), Gamma ray, Astronomy and Astrophysics, Quasar, Space and Planetary Science, Astrophysics - Cosmology and Nongalactic Astrophysics, Flare
Abstract

We present the gamma-ray data of the extraordinary flaring activity above 100 MeV from the flat spectrum radio quasar 3C 454.3 detected by AGILE during the month of December 2009. 3C 454.3, that has been among the most active blazars of the FSRQ type since 2007, was detected in the gamma-ray range with a progressively rising flux since November 10, 2009. The gamma-ray flux reached a value comparable with that of the Vela pulsar on December 2, 2009. Remarkably, between December 2 and 3, 2009 the source more than doubled its gamma-ray emission and became the brightest gamma-ray source in the sky with a peak flux of F_{\gamma,p} = (2000 \pm 400) x 10^-8 ph cm^-2 s^-1 for a 1-day integration above 100 MeV. The gamma-ray intensity decreased in the following days with the source flux remaining at large values near F \simeq (1000 \pm 200) x 10^-8 ph cm^-2 s^-1 for more than a week. This exceptional gamma-ray flare dissipated among the largest ever detected intrinsic radiated power in gamma-rays above 100 MeV (L_{\gamma, source, peak} \simeq 3 x 10^46 erg s^-1, for a relativistic Doppler factor of {\delta} \simeq 30). The total isotropic irradiated energy of the month-long episode in the range 100 MeV - 3 GeV is E_{\gamma,iso} \simeq 10^56 erg. We report the intensity and spectral evolution of the gamma-ray emission across the flaring episode. We briefly discuss the important theoretical implications of our detection., Comment: 17 pages, 3 figures, ApJ accepted

Published
2010

8. Episodic Transient Gamma-Ray Emission From The Microquasar Cygnus X-1

Author

E. Moretti, V. Vittorini, Claudio Labanti, A. Giuliani, M. Trifoglio, C. Pittori, Francesco Lazzarotto, Paolo Lipari, Martino Marisaldi, Attilio Ferrari, Guido Barbiellini, P. Santolamazza, A. Pellizzoni, F. Perotti, S. Vercellone, M. Galli, Piergiorgio Picozza, E. Striani, Y. Evangelista, M. Giusti, Francesco Longo, Alda Rubini, F. Verrecchia, Ennio Morelli, Paolo Giommi, G. De Paris, Massimiliano Fiorini, Marco Tavani, F. Fuschino, G. Di Cocco, A. Rappoldi, E. Vallazza, S. Sabatini, Sergio Colafrancesco, Fulvio Gianotti, A. Argan, Sandro Mereghetti, P. W. Cattaneo, Andrea Bulgarelli, A. Morselli, I. Donnarumma, Enrico Costa, Filippo D'Ammando, Marco Feroci, Luigi Pacciani, M. Prest, Paolo Soffitta, L. A. Antonelli, A. W. Chen, E. Del Monte, Massimo Rapisarda, G. Piano, P. A. Caraveo, Maura Pilia, D. Zanello, G. Pucella, Alessio Trois, E. Scalise, L. Salotti, A. Zambra, F. de Pasquale, Sabatini S, Tavani M, Striani E, Bulgarelli A, Vittorini V, Piano G, Del Monte E, Feroci M, de Pasquale F, Trifoglio M, Gianotti F, Argan A, Barbiellini G, Caraveo P, Cattaneo PW, Chen AW, DAmmando F, Costa E, De Paris G, Di Cocco G, Donnarumma I, Evangelista Y, Ferrari A, Fiorini M, Fuschino F, Galli M, Giuliani A, Giusti M, Labanti C, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mereghetti S, Morelli E, Moretti E, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Picozza P, Pilia M, Pucella G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Scalise E, Soffitta P, Trois A, Vallazza E, Vercellone S, Zambra A, Zanello D, Pittori C, Verrecchia F, Santolamazza P, Giommi P, Colafrancesco S, Antonelli LA, Salotti L, S., Sabatini, M., Tavani, E., Striani, A., Bulgarelli, V., Vittorini, G., Piano, E. D., Monte, M., Feroci, F. d., Pasquale, M., Trifoglio, F., Gianotti, A., Argan, G., Barbiellini, P., Caraveo, P. W., Cattaneo, A. W., Chen, F., D'Ammando, E., Costa, G. D., Pari, G. D., Cocco, I., Donnarumma, Y., Evangelista, A., Ferrari, M., Fiorini, F., Fuschino, M., Galli, A., Giuliani, M., Giusti, C., Labanti, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, E., Morelli, E., Moretti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, P., Picozza, M., Pilia, G., Pucella, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, E., Scalise, P., Soffitta, A., Troi, E., Vallazza, S., Vercellone, A., Zambra, D., Zanello, C., Pittori, F., Verrecchia, P., Santolamazza, P., Giommi, S., Colafrancesco, L. A., Antonelli, and L., Salotti

Subjects
Agile, Black Holes, transient gamma-ray emission, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, High Energy Gamma-ray Astronomy, X-rays: binaries, Cutoff, Cygnus X-1, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Range (particle radiation), Gamma ray, Astronomy and Astrophysics, gamma rays: general, stars: individual (Cygnus X-1), Galaxy, Black hole, Space and Planetary Science, AGILE satellite, Transient (oscillation), Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract

Cygnus X-1 is the archetypal black hole (BH) binary system in our Galaxy. We report the main results of an extensive search for transient gamma-ray emission from Cygnus X-1 carried out in the energy range 100 MeV - 3 GeV by the AGILE satellite, during the period 2007 July - 2009 October. The total exposure time is about 300 days, during which the source was in the "hard" X-ray spectral state. We divided the observing intervals in 2 or 4 week periods, and searched for transient and persistent emission. We report an episode of significant transient gamma-ray emission detected on 2009, October 16 in a position compatible with Cygnus X-1 optical position. This episode, occurred during a hard spectral state of Cygnus X-1, shows that a 1-2 day time variable emission above 100 MeV can be produced during hard spectral states, having important theoretical implications for current Comptonization models for Cygnus X-1 and other microquasars. Except for this one short timescale episode, no significant gamma-ray emission was detected by AGILE. By integrating all available data we obtain a 2$\sigma$ upper limit for the total integrated flux of $F_{\gamma,U.L.} = 3 \times 10^{-8} \rm ph cm^{-2} s^{-1}$ in the energy range 100 MeV - 3 GeV. We then clearly establish the existence of a spectral cutoff in the energy range 1-100 MeV that applies to the typical hard state outside the flaring period and that confirms the historically known spectral cutoff above 1 MeV., Comment: Accepted for publication by ApJ on the 9th of Feb 2010, 5 pages, 3 figures

Published
2010

9. AGILE detection of a rapid gamma-ray flare from the blazar PKS 1510-089 during the GASP-WEBT monitoring

Author

Dario Gasparrini, A. W. Chen, Alan P. Marscher, P. Giommi, C. Pittori, Filippo D'Ammando, T. Froysland, A. Argan, Andrea Bulgarelli, Enrico Costa, M. Sorcia, Carla Buemi, F. Fuschino, Svetlana G. Jorstad, Massimo Rapisarda, Marco Feroci, Arnaud Ferrari, Luigi Pacciani, Uwe Bach, Corrado Trigilio, F. Boffelli, G. De Paris, Jochen Heidt, L. A. Antonelli, Deborah Dultzin, F. Perotti, Raúl Mújica, C. M. Raiteri, Lars Fuhrmann, G. Umana, D. Zanello, A. Zambra, A. Morselli, Mark Gurwell, Paolo Soffitta, Margo F. Aller, Kari Nilsson, Marco Tavani, E. Vallazza, Wen Ping Chen, Tatiana S. Konstantinova, S. Sabatini, I. M. McHardy, Ekaterina Koptelova, A. Rappoldi, M. Fiorini, Ivan Agudo, Martino Marisaldi, José L. Gómez, V. Cocco, J. M. Lopez, Valeri M. Larionov, S. Vercellone, Elina Lindfors, A. Pellizzoni, E. Del Monte, H. Y. Hsiao, G. Pucella, F. Longo, I. Lapshov, L. Salotti, Ivan S. Troitsky, A. Giuliani, Sandro Mereghetti, Paolo Lipari, L. O. Takalo, Mar Roca-Sogorb, P. W. Cattaneo, Omar M. Kurtanidze, Brian W. Taylor, G. Di Rico, M. Trifoglio, David Hiriart, S. Colafrancesco, P. Picozza, G. Barbiellini, G. Piano, Hugh D. Aller, Fulvio Gianotti, Maura Pilia, Alessio Trois, A. A. Arkharov, B. Preger, G. Di Cocco, Givi N. Kimeridze, S. Cutini, Claudio Labanti, Erika Benítez, P. Santolamazza, I. Donnarumma, Y. Evangelista, A. Di Paola, M. Galli, E. N. Kopatskaya, P. A. Caraveo, Paolo Leto, F. Verrecchia, Michael Mommert, Francesco Lazzarotto, Andrei Berdyugin, M. Pasanen, D. A. Melnichuk, M. Prest, M. Villata, D. Blinov, V. Vittorini, DAmmando F, Pucella G, Raiteri CM, Villata M, Vittorini V, Vercellone S, Donnarumma I, Longo F, Tavani M, Argan A, Barbiellini G, Boffelli F, Bulgarelli A, Caraveo P, Cattaneo PW, Chen AW, Cocco V, Costa E, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, Ferrari A, Fiorini M, Froysland T, Fuschino F, Galli M, Gianotti F, Giuliani A, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mereghetti S, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Prest M, Rapisarda M, Rappoldi A, Sabatini S, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zambra A, Zanello D, Agudo I, Aller MF, Aller HD, Arkharov AA, Bach U, Benitez E, Berdyugin A, Blinov DA, Buemi CS, Chen WP, Di Paola A, Di Rico G, Dultzin D, Fuhrmann L, Gomez JL, Gurwell MA, Jorstad SG, Heidt J, Hiriart D, Hsiao HY, Kimeridze G, Konstantinova TS, Kopatskaya EN, Koptelova E, Kurtanidze O, Larionov VM, Leto P, Lindfors E, Lopez JM, Marscher AP, McHardy IM, Melnichuk DA, Mommert M, Mujica R, Nilsson K, Pasanen M, Roca-Sogorb M, Sorcia M, Takalo LO, Taylor B, Trigilio C, Troitsky IS, Umana G, Antonelli LA, Colafrancesco S, Cutini S, Gasparrini D, Pittori C, Preger B, Santolamazza P, Verrecchia F, Giommi P, Salotti L, F., D'Ammando, G., Pucella, C. M., Raiteri, M., Villata, V., Vittorini, S., Vercellone, I., Donnarumma, Longo, Francesco, M., Tavani, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, E., Costa, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, A., Ferrari, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, A., Giuliani, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, S., Mereghetti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, M., Prest, M., Rapisarda, A., Rappoldi, S., Sabatini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, I., Agudo, M. F., Aller, H. D., Aller, A. A., Arkharov, U., Bach, E., Benitez, A., Berdyugin, D. A., Blinov, C. S., Buemi, W. P., Chen, A. D., Paola, G. D., Rico, D., Dultzin, L., Fuhrmann, J. L., Gomez, M. A., Gurwell, S. G., Jorstad, J., Heidt, D., Hiriart, H. Y., Hsiao, G., Kimeridze, T. S., Konstantinova, E. N., Kopatskaya, E., Koptelova, O., Kurtanidze, V. M., Larionov, P., Leto, E., Lindfor, J. M., Lopez, A. P., Marscher, I. M., Mchardy, D. A., Melnichuk, M., Mommert, R., Mujica, K., Nilsson, M., Pasanen, M., Roca Sogorb, M., Sorcia, L. O., Takalo, B., Taylor, C., Trigilio, I. S., Troitsky, G., Umana, L. A., Antonelli, S., Colafrancesco, S., Cutini, D., Gasparrini, C., Pittori, B., Preger, P., Santolamazza, F., Verrecchia, P., Giommi, and L., Salotti

Subjects
Agile, Active galactic nucleus, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Radio spectrum, gamma-ray flare, High Energy Gamma-ray Astronomy, AGILE satellite, Active Galactic Nuclei, law.invention, law, quasar, Blazar, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Gamma ray, Compton scattering, Astronomy and Astrophysics, Quasar, Space and Planetary Science, gamma-rays: observations – mechanism: non-thermal – quasars: individual (PKS 1510-089), Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena, Flare, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report the detection by the AGILE satellite of a rapid gamma-ray flare from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on the Galactic Center region from 1 March to 30 March 2008. This source has been continuosly monitored in the radio-to-optical bands by the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT). Moreover, the gamma-ray flaring episode triggered three ToO observations by the Swift satellite in three consecutive days, starting from 20 March 2008. In the period 1-16 March 2008, AGILE detected gamma-ray emission from PKS 1510-089 at a significance level of 6.2-sigma with an average flux over the entire period of (84 +/- 17) x 10^{-8} photons cm^{-2} s^{-1} for photon energies above 100 MeV. After a predefined satellite re-pointing, between 17 and 21 March 2008, AGILE detected the source at a significance level of 7.3-sigma, with an average flux (E > 100 MeV) of (134 +/- 29) x 10^{-8} photons cm^{-2} s^{-1} and a peak level of (281 +/- 68) x 10^{-8} photons cm^{-2} s^{-1} with daily integration. During the observing period January-April 2008, the source also showed an intense and variable optical activity, with several flaring episodes and a significant increase of the flux was observed at millimetric frequencies. Moreover, in the X-ray band the Swift/XRT observations seem to show an harder-when-brighter behaviour of the source spectrum. The spectral energy distribution of mid-March 2008 is modelled with a homogeneous one-zone synchrotron self Compton emission plus contributions from inverse Compton scattering of external photons from both the accretion disc and the broad line region. Indeed, some features in the optical-UV spectrum seem to indicate the presence of Seyfert-like components, such as the little blue bump and the big blue bump., 10 pages, 4 figures and 2 tables, accepted for publication in A&A

Published
2009

10. Detection of Gamma-Ray Emission from the Eta-Carinae Region

Author

Massimo Rapisarda, C. Pittori, D. Zanello, Roberto Viotti, L. Salotti, Filippo D'Ammando, T. Froysland, Michael F. Corcoran, Claudio Labanti, Maura Pilia, Elena Pian, Paolo Soffitta, A. Zambra, F. Boffelli, Francesco Lazzarotto, Alessio Trois, Geiland Porrovecchio, A. Pellizzoni, F. Fuschino, A. Giuliani, Francesco Longo, Marco Feroci, Luigi Pacciani, L. A. Antonelli, Fulvio Gianotti, G. Piano, Y. Evangelista, G. Di Cocco, M. Prest, E. Del Monte, Marcello Mastropietro, I. Donnarumma, S. Vercellone, Paolo Lipari, I. Lapshov, E. Moretti, V. Vittorini, G. Pucella, G. De Paris, M. Trifoglio, P. A. Caraveo, V. Cocco, Marco Tavani, S. Sabatini, Sergio Colafrancesco, Ennio Morelli, M. Galli, Sandro Mereghetti, P. W. Cattaneo, Piergiorgio Picozza, Massimiliano Fiorini, F. Verrecchia, Martino Marisaldi, A. W. Chen, F. Perotti, A. Morselli, A. Argan, P. Santolamazza, Andrea Bulgarelli, Enrico Costa, Alda Rubini, Paolo Giommi, A. Rappoldi, E. Vallazza, Attilio Ferrari, Guido Barbiellini, Tavani M, Sabatini S, Pian E, Bulgarelli A, Caraveo P, Viotti R F, Corcoran M F, Giuliani A, Pittori C, Verrecchia F, Vercellone S, Mereghetti S, Argan A, Barbiellini G, Boffelli F, Cattaneo P W, Chen A W, Cocco V, DAmmando F, Costa E, DeParis G, Del Monte E, Di Cocco G, Donnarumma I, Evangelista Y, Ferrari A, Feroci M, Fiorini M, Froysland T, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mastropietro M, Morelli E, Moretti E, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Porrovecchio G, Pucella G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Vittorini V, Zambra A, Zanello D, Santolamazza P, Giommi P, Colafrancesco S, Antonelli L A, Salotti L, M., Tavani, S., Sabatini, E., Pian, A., Bulgarelli, P., Caraveo, R. F., Viotti, M. F., Corcoran, A., Giuliani, C., Pittori, F., Verrecchia, S., Vercellone, S., Mereghetti, A., Argan, G., Barbiellini, F., Boffelli, P. W., Cattaneo, A. W., Chen, V., Cocco, F., D'Ammando, E., Costa, G. D., Pari, E. D., Monte, G. D., Cocco, I., Donnarumma, Y., Evangelista, A., Ferrari, M., Feroci, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, M., Mastropietro, E., Morelli, E., Moretti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, G., Porrovecchio, G., Pucella, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, V., Vittorini, A., Zambra, D., Zanello, P., Santolamazza, P., Giommi, S., Colafrancesco, L. A., Antonelli, and L., Salotti

Subjects
Agile, Astrophysics::High Energy Astrophysical Phenomena, Carina Nebula, Flux, FOS: Physical sciences, Astrophysics, Radiation, High Energy Gamma-ray Astronomy, Luminosity, gamma rays: observations, stars: individual: Eta Carinae, stars: winds, outflows, X-rays: binaries, Astrophysics::Solar and Stellar Astrophysics, wind binary Eta Carinae, Astrophysics::Galaxy Astrophysics, Colliding-wind binary, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Nebula, Gamma ray, Galactic region, Astronomy and Astrophysics, AGILE satellite, Unidentified Gamma-ray Sources, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the results of extensive observations by the gamma-ray AGILE satellite of the Galactic region hosting the Carina nebula and the remarkable colliding wind binary Eta Carinae (Eta Car) during the period 2007 July to 2009 January. We detect a gamma-ray source (1AGL J1043-5931) consistent with the position of Eta Car. If 1AGL J1043-5931 is associated with the Eta Car system our data provide the long sought first detection above 100 MeV of a colliding wind binary. The average gamma-ray flux above 100 MeV and integrated over the pre-periastron period 2007 July to 2008 October is F = (37 +/- 5) x 10-8 ph cm-2 s-1 corresponding to an average gamma-ray luminosity of L = 3.4 x 10^34 erg s-1 for a distance of 2.3 kpc. We also report a 2-day gamma-ray flaring episode of 1AGL J1043-5931 on 2008 Oct. 11-13 possibly related to a transient acceleration and radiation episode of the strongly variable shock in the system., Comment: 5 pages, 4 figure, accepted for publication in ApJ Letters

Published
2009

11. First AGILE catalog of high-confidence gamma-ray sources

Author

Dario Gasparrini, I. Donnarumma, F. Mauri, E. Scalise, E. Mattaini, G. Di Cocco, E. Del Monte, E. Rossi, Geiland Porrovecchio, Fulvio Gianotti, F. Fornari, A. Morselli, G. De Paris, Marco Feroci, Luigi Pacciani, G. Di Persio, S. Cutini, A. W. Chen, Sandro Mereghetti, F. Boffelli, P. W. Cattaneo, S. Stellato, Francesco Longo, Massimo Rapisarda, R. Primavera, A. Antonelli, Filippo D'Ammando, M. Galli, Piergiorgio Picozza, F. Tamburelli, C. Pittori, L. Salotti, Paolo Soffitta, F. Verrecchia, A. Zambra, T. Froysland, B. Preger, P. Santolamazza, D. Zanello, V. Vittorini, G. Fanari, F. Fuschino, F. Perotti, Martino Marisaldi, A. Pellizzoni, Marcello Mastropietro, Francesco Lazzarotto, M. Trifoglio, A. Argan, Massimo Frutti, Andrea Bulgarelli, Maura Pilia, P. A. Caraveo, Enrico Costa, Alessio Trois, F. Liello, Claudio Labanti, Alda Rubini, E. Striani, Marco Tavani, S. Vercellone, S. Sabatini, Sergio Colafrancesco, I. Lapshov, Paolo Giommi, Ennio Morelli, M. Prest, Massimiliano Fiorini, P. Lipari, Attilio Ferrari, Guido Barbiellini, Elena Moretti, G. Pucella, A. Mauri, A. Rappoldi, E. Vallazza, Alessandro Traci, V. Cocco, A. Giuliani, Y. Evangelista, T. Contessi, G. Piano, C. Pontoni, C., Pittori, F., Verrecchia, A. W., Chen, A., Bulgarelli, A., Pellizzoni, A., Giuliani, S., Vercellone, Longo, Francesco, M., Tavani, P., Giommi, G., Barbiellini, M., Trifoglio, F., Gianotti, A., Argan, A., Antonelli, F., Boffelli, P., Caraveo, P. W., Cattaneo, V., Cocco, S., Colafrancesco, T., Contessi, E., Costa, S., Cutini, F., D'Ammando, E. D., Monte, G. D., Pari, G. D., Cocco, G. D., Persio, I., Donnarumma, Y., Evangelista, G., Fanari, M., Feroci, A., Ferrari, M., Fiorini, F., Fornari, F., Fuschino, T., Froysland, M., Frutti, M., Galli, D., Gasparrini, C., Labanti, I., Lapshov, F., Lazzarotto, F., Liello, P., Lipari, E., Mattaini, M., Marisaldi, M., Mastropietro, A., Mauri, F., Mauri, S., Mereghetti, E., Morelli, Moretti, Elena, A., Morselli, L., Pacciani, F., Perotti, G., Piano, P., Picozza, M., Pilia, C., Pontoni, G., Porrovecchio, B., Preger, M., Prest, R., Primavera, G., Pucella, M., Rapisarda, A., Rappoldi, E., Rossi, A., Rubini, S., Sabatini, P., Santolamazza, E., Scalise, P., Soffitta, S., Stellato, E., Striani, F., Tamburelli, A., Traci, A., Troi, E., Vallazza, V., Vittorini, A., Zambra, D., Zanello, L., Salotti, Pittori C, Verrecchia F, Chen AW, Bulgarelli A, Pellizzoni A, Giuliani A, Vercellone S, Longo F, Tavani M, Giommi P, Barbiellini G, Trifoglio M, Gianotti F, Argan A, Antonelli A, Boffelli F, Caraveo P, Cattaneo PW, Cocco V, Colafrancesco S, Contessi T, Costa E, Cutini S, DAmmando F, Del Monte E, De Paris G, Di Cocco G, Di Persio G, Donnarumma I, Evangelista Y, Fanari G, Feroci M, Ferrari A, Fiorini M, Fornari F, Fuschino F, Froysland T, Frutti M, Galli M, Gasparrini D, Labanti C, Lapshov I, Lazzarotto F, Liello F, Lipari P, Mattaini E, Marisaldi M, Mastropietro M, Mauri A, Mauri F, Mereghetti S, Morelli E, Moretti E, Morselli A, Pacciani L, Perotti F, Piano G, Picozza P, Pilia M, Pontoni C, Porrovecchio G, Preger B, Prest M, Primavera R, Pucella G, Rapisarda M, Rappoldi A, Rossi E, Rubini A, Sabatini S, Santolamazza P, Scalise E, Soffitta P, Stellato S, Striani E, Tamburelli F, Traci A, Trois A, Vallazza E, Vittorini V, Zambra A, Zanello D, and Salotti L

Subjects
Agile, catalog, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Field of view, Astrophysics, gamma-ray source, High Energy Gamma-ray Astronomy, Pulsar, X and gamma detection, Blazar, media_common, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Detector, Gamma ray, gamma rays: observations, catalogs, Astronomy and Astrophysics, Radius, AGILE satellite, Catalogs, Space and Planetary Science, Sky, Satellite, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the first catalog of high-confidence gamma-ray sources detected by the AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Catalogued sources are detected by merging all the available data over the entire time period. AGILE, launched in April 2007, is an ASI mission devoted to gamma-ray observations in the 30 MeV - 50 GeV energy range, with simultaneous X-ray imaging capability in the 18-60 keV band. This catalog is based on Gamma-Ray Imaging Detector (GRID) data for energies greater than 100 MeV. For the first AGILE catalog we adopted a conservative analysis, with a high-quality event filter optimized to select gamma-ray events within the central zone of the instrument Field of View (radius of 40 degrees). This is a significance-limited (4 sigma) catalog, and it is not a complete flux-limited sample due to the non-uniform first year AGILE sky coverage. The catalog includes 47 sources, 21 of which are associated with confirmed or candidate pulsars, 13 with Blazars (7 FSRQ, 4 BL Lacs, 2 unknown type), 2 with HMXRBs, 2 with SNRs, 1 with a colliding-wind binary system, 8 with unidentified sources., Revised version, 15 pages, 3 figures, 3 tables. To be published in Astronomy and Astrophysics. Text improved and clarified. Refined analysis of complex regions of the Galactic plane yields a new list of high-confidence sources including 47 sources (compared with the 40 sources appearing in the first version)

Published
2009

12. Monitoring the hard X-ray sky with SuperAGILE

Author

S. Cutini, S. Stellato, M. Trifoglio, Ennio Morelli, G. De Paris, Martino Marisaldi, Massimiliano Fiorini, F. Boffelli, G. Fanari, F. Fuschino, F. Fornari, C. Pittori, I. Donnarumma, T. Froysland, A. W. Chen, F. Liello, F. Perotti, A. Pellizzoni, Francesco Longo, Attilio Ferrari, A. Morselli, Guido Barbiellini, V. Vittorini, A. Antonelli, G. Pucella, A. Argan, Alessandro Traci, Marco Tavani, S. Sabatini, Andrea Bulgarelli, Sergio Colafrancesco, Enrico Costa, F. Mauri, Sandro Mereghetti, Francesco Lazzarotto, P. W. Cattaneo, M. Prest, R. Primavera, M. Galli, Piergiorgio Picozza, F. Tamburelli, P. Santolamazza, F. Verrecchia, Paolo Lipari, Elena Moretti, Marco Feroci, Luigi Pacciani, Alda Rubini, I. Lapshov, A. Mauri, Paolo Giommi, F. D'Ammando, A. Rappoldi, E. Vallazza, V. Cocco, A. Giuliani, P. A. Caraveo, Dario Gasparrini, Y. Evangelista, G. Piano, L. Salotti, A. Zambra, C. Pontoni, E. Rossi, Massimo Rapisarda, D. Zanello, Claudio Labanti, E. Del Monte, E. Mattaini, G. Di Cocco, Massimo Frutti, S. Vercellone, G. Di Persio, Paolo Soffitta, B. Preger, Marcello Mastropietro, Maura Pilia, Alessio Trois, Fulvio Gianotti, Geiland Porrovecchio, M., Feroci, E., Costa, E. D., Monte, I., Donnarumma, Y., Evangelista, I., Lapshov, F., Lazzarotto, L., Pacciani, M., Rapisarda, P., Soffitta, G. D., Persio, M., Frutti, M., Mastropietro, E., Morelli, G., Porrovecchio, A., Rubini, A., Antonelli, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, S., Colafrancesco, S., Cutini, F., D'Ammando, G. D., Pari, G. D., Cocco, G., Fanari, A., Ferrari, M., Fiorini, F., Fornari, F., Fuschino, T., Froysland, M., Galli, D., Gasparrini, F., Gianotti, P., Giommi, A., Giuliani, C., Labanti, F., Liello, P., Lipari, Longo, Francesco, E., Mattaini, M., Marisaldi, A., Mauri, F., Mauri, S., Mereghetti, E., Moretti, A., Morselli, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, C., Pittori, C., Pontoni, B., Preger, M., Prest, R., Primavera, G., Pucella, A., Rappoldi, E., Rossi, S., Sabatini, P., Santolamazza, M., Tavani, S., Stellato, F., Tamburelli, A., Traci, M., Trifoglio, A., Troi, E., Vallazza, S., Vercellone, F., Verrecchia, V., Vittorini, A., Zambra, D., Zanello, L., Salotti, Feroci M, Costa E, Del Monte E, Donnarumma I, Evangelista Y, Lapshov I, Lazzarotto F, Pacciani L, Rapisarda M, Soffitta P, Di Persio G, Frutti M, Mastropietro M, Morelli E, Porrovecchio G, Rubini A, Antonelli A, Argan A, Barbiellini G, Boffelli F, Bulgarelli A, Caraveo P, Cattaneo PW, Chen AW, Cocco V, Colafrancesco S, Cutini S, DAmmando F, De Paris G, Di Cocco G, Fanari G, Ferrari A, Fiorini M, Fornari F, Fuschino F, Froysland T, Galli M, Gasparrini D, Gianotti F, Giommi P, Giuliani A, Labanti C, Liello F, Lipari P, Longo F, Mattaini E, Marisaldi M, Mauri A, Mauri F, Mereghetti S, Moretti E, Morselli A, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Pittori C, Pontoni C, Preger B, Prest M, Primavera R, Pucella G, Rappoldi A, Rossi E, Sabatini S, Santolamazza P, Tavani M, Stellato S, Tamburelli F, Traci A, Trifoglio M, Trois A, Vallazza E, Vercellone S, Verrecchia F, Vittorini V, Zambra A, Zanello D, and Salotti L

Subjects
Agile, Photon, High Energy Gamma-ray Astronomy, AGILE satellite, X-ray sources, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Field of view, SuperAgile, x-ray detector, extragalactic and galactic sources, Optics, Angular resolution, Instrumentation and Methods for Astrophysics (astro-ph.IM), media_common, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), COSMIC cancer database, business.industry, Detector, Gamma ray, Astronomy and Astrophysics, instrumentation: detectors – X-rays: binaries – X-rays: general, Space and Planetary Science, Sky, Celestial coordinate system, business, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

SuperAGILE is the hard X-ray monitor of the AGILE gamma ray mission, in orbit since 23$^{rd}$ April 2007. It is an imaging experiment based on a set of four independent silicon strip detectors, equipped with one-dimensional coded masks, operating in the nominal energy range 18-60 keV. The main goal of SuperAGILE is the observation of cosmic sources simultaneously with the main gamma-ray AGILE experiment, the Gamma Ray Imaging Detector (GRID). Given its $\sim$steradian-wide field of view and its $\sim$15 mCrab day-sensitivity, SuperAGILE is also well suited for the long-term monitoring of Galactic compact objects and the detection of bright transients. The SuperAGILE detector properties and design allow for a 6 arcmin angular resolution in each of the two independent orthogonal projections of the celestial coordinates. Photon by photon data are continuously available by the experiment telemetry, and are used to derive images and fluxes of individual sources, with integration times depending on the source intensity and position in the field of view. In this paper we report on the main scientific results achieved by SuperAGILE over its first two years in orbit, until April 2009., Comment: Accepted for publication on Astronomy & Astrophysics

Published
2009
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13. MULTIWAVELENGTH OBSERVATIONS OF A TeV-FLARE FROM W COMAE

Author

Veritas, Collaboration, Acciari, V. A., Aliu, E., Aune, T., Beilicke, M., Benbow, W., Bottcher, M., Boltuch, D., Buckley, J. H., Bradbury, S. M., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Ciupik, L., Cogan, P., Cui, W., Dickherber, R., Duke, C., Falcone, A., Finley, J. P., Fortin, P., Fortson, L., Furniss, A., Galante, N., Gall, D., Gibbs, K., Gillanders, G. H., Grube, J., Guenette, R., Gyuk, G., Hanna, D., Holder, J., Hui, C. M., Humensky, T. B., Kaaret, P., Karlsson, N., Kertzman, M., Kieda, D., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., Lebohec, S., Maier, G., Mcarthur, S., Mccann, A., Mccutcheon, M., Millis, J., Moriarty, P., Ong, R. A., Otte, A. N., Pandel, D., Perkins, J. S., Pichel, A., Pohl, M., Quinn, J., Ragan, K., Reyes, L. C., Reynolds, P. T., Roache, E., Rose, H. J., Sembroski, G. H., Smith, A. W., Steele, D., Theiling, M., Thibadeau, S., Varlotta, A., Vassiliev, V. V., Vincent, S., Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A., Weisgarber, T., Williams, D. A., Wissel, S., Wood, M., Agile, The Team, Pian, E., Vercellone, S., Donnarumma, I., D Ammando, F., Bulgarelli, A., Chen, A. W., Giuliani, A., Longo, F., Pacciani, L., Pucella, G., Vittorini, V., Tavani, M., Argan, A., Barbiellini, G., Caraveo, P., Cattaneo, P. W., Cocco, V., Costa, E., Del Monte, E., Paris, G., Di Cocco, G., Evangelista, Y., Feroci, M., 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., Piano, G., Picozza, P., Pilia, M., Porrovecchio, G., Prest, M., Rapisarda, M., Rappoldi, A., Rubini, A., Soffitta, S. Sabatini P., Trifoglio, M., Trois, A., Vallazza, E., Zambra, A., Zanello, D., Pittori, C., Santolamazza, P., Verrecchia, F., Giommi, P., Colafrancesco, S., Salotti, L., Massimo Villata, Raiteri, C. M., Aller, H. D., Aller, M. F., Arkharov, A. A., Efimova, N. V., Larionov, V. M., Leto, P., Ligustri, R., Lindfors, E., Pasanen, M., Kurtanidze, O. M., Tetradze, S. D., Lahteenmaki, A., Kotiranta, M., Cucchiara, A., Romano, P., Nesci, R., Pursimo, T., Heidt, J., Benitez, E., Hiriart, D., Nilsson, K., Berdyugin, A., Mujica, R., Dultzin, D., Lopez, J. M., Mommert, M., Sorcia, M., La Calle Perez, I., V. A., Acciari, E., Aliu, T., Aune, M., Beilicke, W., Benbow, M., Bottcher, D., Boltuch, J. H., Buckley, S. M., Bradbury, V., Bugaev, K., Byrum, A., Cannon, A., Cesarini, L., Ciupik, P., Cogan, W., Cui, R., Dickherber, C., Duke, A., Falcone, J. P., Finley, P., Fortin, L., Fortson, A., Furni, N., Galante, D., Gall, K., Gibb, G. H., Gillander, J., Grube, R., Guenette, G., Gyuk, D., Hanna, J., Holder, C. M., Hui, T. B., Humensky, P., Kaaret, N., Karlsson, M., Kertzman, D., Kieda, A., Konopelko, H., Krawczynski, F., Krennrich, M. J., Lang, S., Lebohec, G., Maier, S., Mcarthur, A., Mccann, M., Mccutcheon, J., Milli, P., Moriarty, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, A., Pichel, M., Pohl, J., Quinn, K., Ragan, L. C., Reye, P. T., Reynold, E., Roache, H. J., Rose, G. H., Sembroski, A. W., Smith, D., Steele, M., Theiling, S., Thibadeau, A., Varlotta, V. V., Vassiliev, S., Vincent, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, T., Weisgarber, D. A., William, S., Wissel, M., Wood, E., Pian, S., Vercellone, I., Donnarumma, F., D'Ammando, A., Bulgarelli, A. W., Chen, A., Giuliani, Longo, Francesco, L., Pacciani, G., Pucella, V., Vittorini, M., Tavani, A., Argan, G., Barbiellini, P., Caraveo, P. W., Cattaneo, V., Cocco, E., Costa, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, 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, G., Piano, P., Picozza, M., Pilia, G., Porrovecchio, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, S., Sabatini, 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, H. D., Aller, M. F., Aller, A. A., Arkharov, N. V., Efimova, V. M., Larionov, P., Leto, R., Ligustri, E., Lindfor, M., Pasanen, O. M., Kurtanidze, S. D., Tetradze, A., Lahteenmaki, M., Kotiranta, A., Cucchiara, P., Romano, R., Nesci, T., Pursimo, J., Heidt, E., Benitez, D., Hiriart, K., Nilsson, A., Berdyugin, R., Mujica, D., Dultzin, J. M., Lopez, M., Mommert, M., Sorcia, I. D., Perez, Acciari VA, Aliu E, Aune T, Beilicke M, Benbow W, Bottcher M, Boltuch D, Buckley JH, Bradbury SM, Bugaev V, Byrum K, Cannon A, Cesarini A, Ciupik L, Cogan P, Cui W, Dickherber R, Duke C, Falcone A, Finley JP, Fortin P, Fortson L, Furniss A, Galante N, Gall D, Gibbs K, Gillanders GH, Grube J, Guenette R, Gyuk G, Hanna D, Holder J, Hui CM, Humensky TB, Kaaret P, Karlsson N, Kertzman M, Kieda D, Konopelko A, Krawczynski H, Krennrich F, Lang MJ, LeBohec S, Maier G, McArthur S, McCann A, McCutcheon M, Millis J, Moriarty P, Ong RA, Otte AN, Pandel D, Perkins JS, Pichel A, Pohl M, Quinn J, Ragan K, Reyes LC, Reynolds PT, Roache E, Rose HJ, Sembroski GH, Smith AW, Steele D, Theiling M, Thibadeau S, Varlotta A, Vassiliev VV, Vincent S, Wakely SP, Ward JE, Weekes TC, Weinstein A, Weisgarber T, Williams DA, Wissel S, Wood M, Pian E, Vercellone S, Donnarumma I, DAmmando F, Bulgarelli A, Chen AW, Giuliani A, Longo F, Pacciani L, Pucella G, Vittorini V, Tavani M, Argan A, Barbiellini G, Caraveo P, Cattaneo PW, Cocco V, Costa E, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, 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, Piano G, Picozza P, Pilia M, Porrovecchio G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Sabatini S, 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 CM, Aller HD, Aller MF, Arkharov AA, Efimova NV, Larionov VM, Leto P, Ligustri R, Lindfors E, Pasanen M, Kurtanidze OM, Tetradze SD, Lahteenmaki A, Kotiranta M, Cucchiara A, Romano P, Nesci R, Pursimo T, Heidt J, Benitez E, Hiriart D, Nilsson K, Berdyugin A, Mujica R, Dultzin D, Lopez JM, Mommert M, Sorcia M, and Perez ID

Subjects
Agile, High energy, agile space mission, Astrophysics::High Energy Astrophysical Phenomena, bl-lacertae objects, FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, telescope, 01 natural sciences, High Energy Gamma-ray Astronomy, blazar, law.invention, multiwavelength, BL Lacertae, law, 0103 physical sciences, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Very High Energy Gamma-ray Astronomy, AGILE satellite, Active Galactic Nuclei, Gamma ray, background-radiation, Astronomy and Astrophysics, gamma-ray emission, lac objects, spectral energy-distributions, veritas observations, Space and Planetary Science, source list, Spectral energy distribution, BL Lacertae objects: individual (W Com), Astrophysics - High Energy Astrophysical Phenomena, gamma rays: observations, Flare, BL Lac object
Abstract

We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The very high energy gamma-ray signal was detected by VERITAS on 2008 June 7-8 with a flux F(>200 GeV) = (5.7+-0.6)x10^-11 cm-2s-1, about three times brighter than during the discovery of gamma-ray emission from W Com by VERITAS in 2008 March. The initial detection of this flare by VERITAS at energies above 200 GeV was followed by observations in high energy gamma-rays (AGILE, E>100 MeV), and X-rays (Swift and XMM-Newton), and at UV, and ground-based optical and radio monitoring through the GASP-WEBT consortium and other observatories. Here we describe the multiwavelength data and derive the spectral energy distribution (SED) of the source from contemporaneous data taken throughout the flare., 26 pages, 5 figures; Accepted for publication by The Astrophysical Journal

Published
2009

14. Detection of Gamma-Ray Emission from the Vela Pulsar Wind Nebula with AGILE

Author

A. Pellizzoni, M. Galli, A. Giuliani, F. Verrecchia, Francesco Lazzarotto, E. Vallazza, C. Pittori, T. Contessi, N. D'Amico, G. Piano, G. De Paris, A. Argan, Sandro Mereghetti, E. Rossi, E. Scalise, A. Morselli, Arnaud Ferrari, E. Striani, P. Santolamazza, Andrea Bulgarelli, F. Fuschino, I. Lapshov, S. Colafrancesco, L. Salotti, I. Donnarumma, Y. Evangelista, Massimo Rapisarda, G. Di Cocco, A. Possenti, Enrico Costa, S. Sabatini, Alda Rubini, P. W. Cattaneo, G. Pucella, P. Picozza, Marco Tavani, G. Barbiellini, Elena Moretti, Martino Marisaldi, A. Rappoldi, D. Zanello, M. Prest, V. Cocco, M. Mastropietro, F. Perotti, M. Burgay, V. Vittorini, A. W. Chen, Claudio Labanti, A. Zambra, Paolo Lipari, P. Giommi, J. Palfreyman, Giovanni F. Bignami, P. A. Caraveo, M. Trifoglio, M. Fiorini, E. Del Monte, Aidan Hotan, F. Longo, Angelo Antonelli, Marco Feroci, Luigi Pacciani, Maura Pilia, Alessio Trois, Paolo Esposito, Fulvio Gianotti, G. Di Persio, Filippo D'Ammando, Paolo Soffitta, S. Vercellone, Pellizzoni A, Trois A, Tavani M, Pilia M, Giuliani A, Pucella G, Esposito P, Sabatini S, Piano G, Argan A, Barbiellini G, Bulgarelli A, Burgay M, Caraveo P, Cattaneo PW, Chen AW, Cocco V, Contessi T, Costa E, DAmmando F, Del Monte E, De Paris G, Di Cocco G, Di Persio G, Donnarumma I, Evangelista Y, Feroci M, Ferrari A, Fiorini M, Fuschino F, Galli M, Gianotti F, Hotan A, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mastropietro M, Mereghetti S, Moretti E, Morselli A, Pacciani L, Palfreyman J, Perotti F, Picozza P, Pittori C, Possenti A, Prest M, Rapisarda M, Rappoldi A, Rossi E, Rubini A, Santolamazza P, Scalise E, Soffitta P, Striani E, Trifoglio M, Vallazza E, Vercellone S, Verrecchia F, Vittorini V, Zambra A, Zanello D, Giommi P, Colafrancesco S, Antonelli A, Salotti L, D'Amico N, Bignami GF, A., Pellizzoni, A., Troi, M., Tavani, M., Pilia, A., Giuliani, G., Pucella, P., Esposito, S., Sabatini, G., Piano, A., Argan, G., Barbiellini, A., Bulgarelli, M., Burgay, P., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, T., Contessi, E., Costa, F., D'Ammando, E. D., Monte, G. D., Pari, G. D., Cocco, G. D., Persio, I., Donnarumma, Y., Evangelista, M., Feroci, A., Ferrari, M., Fiorini, F., Fuschino, M., Galli, F., Gianotti, A., Hotan, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Moretti, A., Morselli, L., Pacciani, J., Palfreyman, F., Perotti, P., Picozza, C., Pittori, A., Possenti, M., Prest, M., Rapisarda, A., Rappoldi, E., Rossi, A., Rubini, P., Santolamazza, E., Scalise, P., Soffitta, E., Striani, M., Trifoglio, E., Vallazza, S., Vercellone, F., Verrecchia, V., Vittorini, A., Zambra, D., Zanello, P., Giommi, S., Colafrancesco, A., Antonelli, L., Salotti, N., D'Amico, and G. F., Bignami

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Vela, Pulsar wind nebula, High Energy Gamma-ray Astronomy, gamma detection, Relativistic particle, AGILE, Pulsar Wind Nebulae, Pulsar, Astrophysics::Solar and Stellar Astrophysics, AGILE satellite, education, Astrophysics::Galaxy Astrophysics, pulsar, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), education.field_of_study, Multidisciplinary, Vela Pulsar Wind Nebula, AGILE, gamma-rays, Gamma ray, Astronomy, Physics::Space Physics, Astrophysics - High Energy Astrophysical Phenomena, Phenomenology (particle physics), X-ray pulsar
Abstract

Pulsars are known to power winds of relativistic particles that can produce bright nebulae by interacting with the surrounding medium. These pulsar wind nebulae (PWNe) are observed in the radio, optical, x-rays and, in some cases, also at TeV energies, but the lack of information in the gamma-ray band prevents from drawing a comprehensive multiwavelength picture of their phenomenology and emission mechanisms. Using data from the AGILE satellite, we detected the Vela pulsar wind nebula in the energy range from 100 MeV to 3 GeV. This result constrains the particle population responsible for the GeV emission, probing multivavelength PWN models, and establishes a class of gamma-ray emitters that could account for a fraction of the unidentified Galactic gamma-ray sources., Comment: Accepted by Science; first published online on December 31, 2009 in Science Express. Science article and Supporting Online Material are available at http://www.sciencemag.org

Published
2009
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15. DISCOVERY OF NEW GAMMA-RAY PULSARS WITH AGILE

Author

Francesco Longo, S. Sabatini, Maura Pilia, Y. Evangelista, Alessio Trois, A. De Luca, Teresa Mineo, G. De Paris, P. A. Caraveo, D. Zanello, Marco Tavani, Fulvio Gianotti, V. Vittorini, Martino Marisaldi, G. Di Cocco, M. Trifoglio, A. W. Chen, Massimiliano Fiorini, B. Preger, A. Rappoldi, E. Vallazza, Ismaël Cognard, Patrick Weltevrede, F. Fornari, Paolo Esposito, M. Prest, Claudio Labanti, A. Giuliani, V. Cocco, N. D'Amico, Massimo Rapisarda, Sandro Mereghetti, P. W. Cattaneo, A. Argan, Andrea Bulgarelli, F. Perotti, Enrico Costa, I. Lapshov, Simon Johnston, I. Donnarumma, L. Salotti, A. Zambra, Francesco Lazzarotto, E. Del Monte, F. Boffelli, M. Galli, Piergiorgio Picozza, F. Verrecchia, Alessandro Corongiu, C. Pittori, T. Froysland, A. Pellizzoni, Paolo Lipari, Giovanni F. Bignami, Gilles Theureau, F. Fuschino, M. Burgay, A. Morselli, G. Pucella, Michael Kramer, Marco Feroci, Luigi Pacciani, S. Vercellone, G. Piano, Guido Barbiellini, P. Santolamazza, Paolo Giommi, Filippo D'Ammando, Paolo Soffitta, Andrea Possenti, INAF - Osservatorio Astronomico di Cagliari (OAC), Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astronomico di Milano (OAM), INAF - Osservatorio Astronomico di Roma (OAR), INAF - Osservatorio Astronomico di Bologna (OABO), 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)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Australia Telescope National Facility (ATNF), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), Jodrell Bank Centre for Astrophysics (JBCA), University of Manchester [Manchester], Università degli studi di Trieste, Galaxies, Etoiles, Physique, Instrumentation (GEPI), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Istituto Nazionale di Fisica Nucleare [Sezione di Roma 1] (INFN), Istituto Nazionale di Fisica Nucleare, Agenzia Spaziale Italiana (ASI), Istituto Universitario di Studi Superiori (IUSS), Pellizzoni A, Pilia M, Possenti A, Chen A, Giuliani A, Trois A, Caraveo P, Del Monte E, Fornari F, Fuschino F, Mereghetti S, Tavani M, Argan A, Burgay M, Cognard I, Corongiu A, Costa E, D'Amico N, De Luca A, Esposito P, Evangelista Y, Feroci M, Johnston S, Kramer M, Longo F, Marisaldi M, Theureau G, Weltevrede P, Barbiellini G, Boffelli F, Bulgarelli A, Cattaneo P W, Cocco V, DAmmando F, DeParis G, Di Cocco G, Donnarumma I, Fiorini M, Froysland T, Galli M, Gianotti F, Labanti C, Lapshov, I., Lazzarotto, F., Lipari P, Mineo T, Morselli A, Pacciani L, Perotti F, Piano G, Picozza P, Prest M, Pucella G, Rapisarda M, Rappoldi A, Sabatini S, Soffitta P, Trifoglio M, Vallazza E, Vercellone S, Vittorini V, Zambra A, Zanello D, Pittori C, Verrecchia F, Preger B, Santolamazza P, Giommi P, Salotti L, Bignami G F, A., Pellizzoni, M., Pilia, A., Possenti, A., Chen, A., Giuliani, A., Troi, P., Caraveo, E. D., Monte, F., Fornari, F., Fuschino, S., Mereghetti, M., Tavani, A., Argan, M., Burgay, I., Cognard, A., Corongiu, E., Costa, N., D'Amico, A. D., Luca, P., Esposito, Y., Evangelista, M., Feroci, S., Johnston, M., Kramer, Longo, Francesco, M., Marisaldi, G., Theureau, P., Weltevrede, G., Barbiellini, F., Boffelli, A., Bulgarelli, P. W., Cattaneo, V., Cocco, F., D'Ammando, G. D., Pari, G. D., Cocco, I., Donnarumma, M., Fiorini, T., Froysland, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, T., Mineo, A., Morselli, L., Pacciani, F., Perotti, G., Piano, P., Picozza, M., Prest, G., Pucella, M., Rapisarda, A., Rappoldi, S., Sabatini, P., Soffitta, M., Trifoglio, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, D., Zanello, C., Pittori, F., Verrecchia, B., Preger, P., Santolamazza, P., Giommi, L., Salotti, and G. F., Bignami

Subjects
Agile, High Energy Gamma-ray Astronomy, AGILE satellite, Pulsars, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, radio pulsar, Astrophysics, 01 natural sciences, stars: neutron, Pulsar, Millisecond pulsar, pulsars: general, 0103 physical sciences, Egret, pulsars: individual (PSR J2229+6114 PSR B1509–58 PSR B1821–24), 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), biology, 010308 nuclear & particles physics, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Gamma ray, Static timing analysis, Astronomy and Astrophysics, biology.organism_classification, gamma rays: observations, pulsars: general, pulsars: individual: PSR J2229 + 6114 PSR B1509 – 58 PSR B1821 – 24, stars: neutron, Space and Planetary Science, Globular cluster, Astrophysics - High Energy Astrophysical Phenomena, gamma rays: observations
Abstract

Using gamma-ray data collected by the Astrorivelatore Gamma ad Immagini LEggero (AGILE) satellite over a period of almost one year (from 2007 July to 2008 June), we searched for pulsed signals from 35 potentially interesting radio pulsars, ordered according to $F_{\gamma}\propto \sqrt{\dot{E}} d^{-2}$ and for which contemporary or recent radio data were available. AGILE detected three new top-ranking nearby and Vela-like pulsars with good confidence both through timing and spatial analysis. Among the newcomers we find pulsars with very high rotational energy losses, such as the remarkable PSR B1509-58 with a magnetic field in excess of 10^13 Gauss, and PSR J2229+6114 providing a reliable identification for the previously unidentified EGRET source 3EG 2227+6122. Moreover, the powerful millisecond pulsar B1821-24, in the globular cluster M28, is detected during a fraction of the observations. Four other promising gamma-ray pulsar candidates, among which is the notable J2043+2740 with an age in excess of 1 million years, show a possible detection in the timing analysis only and deserve confirmation., Comment: Minor changes to match the final ApJ version. 5 pages in emulate-apj style, 1 table, 3 figures

Published
2009
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16. AGILE observation of a gamma-ray flare from the blazar 3C 279

Author

A. Morselli, A. W. Chen, P. Giommi, Sandro Mereghetti, P. W. Cattaneo, F. Perotti, I. Donnarumma, Y. Evangelista, A. Argan, A. Trois, Andrea Bulgarelli, S. Colafrancesco, Martino Marisaldi, F. Lazzarotto, Enrico Costa, G. De Paris, P. Picozza, M. Prest, F. Fornari, M. Rapisarda, P. Soffitta, Y. Lapshov, F. Longo, A. Pellizzoni, F. Fuschino, M. Galli, F. Verrecchia, L. Salotti, Marco Tavani, A. Giuliani, B. Preger, C. Pittori, T. Froysland, P. A. Caraveo, G. Tosti, Fulvio Gianotti, V. Cocco, M. Trifoglio, Paolo Lipari, E. Vallazza, A. Rappoldi, Dario Gasparrini, A. Zambra, F. D'Ammando, M. Feroci, M. Fiorini, E. Del Monte, G. Pucella, Domenico Impiombato, Guido Barbiellini, V. Vittorini, P. Santolamazza, Claudio Labanti, D. Zanello, G. Di Cocco, F. Boelli, S. Cutini, L. Pacciani, S. Vercellone, Giuliani A, DAmmando F, Vercellone S, Vittorini V, Chen AW, Donnarumma I, Pacciani L, Pucella G, Trois A, Bulgarelli A, Longo F, Tavani M, Tosti G, Impiombato D, Argan A, Barbiellini F, Boffelli F, Caraveo PA, Cattaneo PW, Cocco V, Costa E, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, Fiorini M, Fornari F, Froysland T, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov Y, Lazzarotto F, Lipari P, Marisaldi M, Mereghetti S, Morselli A, Pellizzoni A, Perotti F, Picozza P, Prest M, Rapisarda M, Rappoldi A, Soffitta P, Trifoglio M, Vallazza E, Zambra A, Zanello D, Cutini S, Gasparrini D, Pittori C, Preger B, Santolamazza P, Verrecchia F, Giommi P, Colafrancesco S, Salotti L, A., Giuliani, F., D'Ammando, S., Vercellone, V., Vittorini, A. W., Chen, I., Donnarumma, L., Pacciani, G., Pucella, A., Troi, A., Bulgarelli, Longo, Francesco, M., Tavani, G., Tosti, D., Impiombato, A., Argan, F., Barbiellini, F., Boffelli, P. A., Caraveo, P. W., Cattaneo, V., Cocco, E., Costa, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, M., Fiorini, F., Fornari, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, Y., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, S., Mereghetti, A., Morselli, A., Pellizzoni, F., Perotti, P., Picozza, M., Prest, M., Rapisarda, A., Rappoldi, P., Soffitta, M., Trifoglio, E., Vallazza, A., Zambra, D., Zanello, S., Cutini, D., Gasparrini, C., Pittori, B., Preger, P., Santolamazza, F., Verrecchia, P., Giommi, S., Colafrancesco, and L., Salotti

Subjects
High Energy Gamma-ray Astronomy, Active Galactic Nuclei, AGILE satellite, Agile, Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, X and gamma emission, Astrophysics, gamma-ray flare, law.invention, Telescope, law, gamma rays: observations, galaxies: quasars: individual: 3C 279, quasar, Blazar, Physics, Astrophysics (astro-ph), Compton scattering, Gamma ray, Astronomy and Astrophysics, Quasar, Space and Planetary Science, Spectral energy distribution, Flare
Abstract

Context. We report the detection by the AGILE satellite of an intense gamma-ray flare from the gamma-ray source 3EG J1255-0549, associated to the Flat Spectrum Radio Quasar 3C 279, during the AGILE pointings towards the Virgo Region on 2007 July 9-13. Aims. The simultaneous optical, X-ray and gamma-ray covering allows us to study the spectral energy distribution (SED) and the theoretical models relative to the flaring episode of mid-July. Methods. AGILE observed the source during its Science Performance Verification Phase with its two co-aligned imagers: the Gamma- Ray Imaging Detector (GRID) and the hard X-ray imager (Super-AGILE) sensitive in the 30 MeV - 50 GeV and 18 - 60 keV respectively. During the AGILE observation the source was monitored simultaneously in optical band by the REM telescope and in the X-ray band by the Swift satellite through 4 ToO observations. Results. During 2007 July 9-13 July 2007, AGILE-GRID detected gamma-ray emission from 3C 279, with the source at ~2 deg from the center of the Field of View, with an average flux of (210+-38) 10^-8 ph cm^-2 s^-1 for energy above 100 MeV. No emission was detected by Super-AGILE, with a 3-sigma upper limit of 10 mCrab. During the observation lasted about 4 days no significative gamma-ray flux variation was observed. Conclusions. The Spectral Energy Distribution is modelled with a homogeneous one-zone Synchrotron Self Compton emission plus the contributions by external Compton scattering of direct disk radiation and, to a lesser extent, by external Compton scattering of photons from the Broad Line Region., Accepted for publication in Astronomy and Astrophysics

Published
2009

17. AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 in September-October 2007

Author

F. Perotti, A. W. Chen, P. Giommi, Dario Gasparrini, Paolo Lipari, L. A. Antonelli, F. Boffelli, Arnaud Ferrari, Sandro Mereghetti, P. W. Cattaneo, Marco Feroci, Luigi Pacciani, D. Carosati, D. Zanello, C. Labanti, Francesco Lazzarotto, C. Pittori, Martino Marisaldi, T. Froysland, A. Argan, M. Pasanen, Valeri M. Larionov, A. Pellizzoni, Andrea Bulgarelli, Enrico Costa, Massimo Frutti, I. Donnarumma, S. Vercellone, G. De Paris, I. Lapshov, F. Fuschino, Massimo Rapisarda, Marco Tavani, Marcello Mastropietro, Fulvio Gianotti, A. Morselli, P. Caraveo, Sergio Colafrancesco, M. Prest, M. Villata, E. Del Monte, Paolo Soffitta, A. Giuliani, Geiland Porrovecchio, M. Galli, Piergiorgio Picozza, Alessio Trois, Ennio Morelli, F. Verrecchia, Massimiliano Fiorini, S. Cutini, P. Santolamazza, G. Pucella, Alda Rubini, Omar M. Kurtanidze, Guido Barbiellini, Y. Evangelista, V. Vittorini, M. Trifoglio, L. Salotti, A. Zambra, Filippo D'Ammando, C. M. Raiteri, Francesco Longo, V. Cocco, A. Rappoldi, E. Vallazza, G. Di Cocco, Chen AW, DAmmando F, Villata M, Raiteri CM, Tavani M, Vittorini V, Bulgarelli A, Donnarumma I, Ferrari A, Giuliani A, Longo F, Pacciani L, Pucella G, Vercellone S, Argan A, Barbiellini G, Boffelli F, Caraveo P, Carosati D, Cattaneo PW, Cocco V, Costa E, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, Fiorini M, Froysland T, Frutti M, Fuschino F, Galli M, Gianotti F, Kurtanidze OM, Labanti C, Lapshov I, Larionov VM, Lazzarotto F, Lipari P, Marisaldi M, Mastropietro M, Mereghetti S, Morelli E, Morselli A, Pasanen M, 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, Cutini S, Gasparrini D, Pittori C, Santolamazza P, Verrecchia F, Giommi P, Antonelli LA, Colafrancesco S, Salotti L, A. W., Chen, F., D'Ammando, M., Villata, C. M., Raiteri, M., Tavani, V., Vittorini, A., Bulgarelli, I., Donnarumma, A., Ferrari, A., Giuliani, Longo, Francesco, L., Pacciani, G., Pucella, S., Vercellone, A., Argan, G., Barbiellini, F., Boffelli, P., Caraveo, D., Carosati, P. W., Cattaneo, V., Cocco, E., Costa, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, M., Fiorini, T., Froysland, M., Frutti, F., Fuschino, M., Galli, F., Gianotti, O. M., Kurtanidze, C., Labanti, I., Lapshov, V. M., Larionov, F., Lazzarotto, P., Lipari, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Morelli, A., Morselli, M., Pasanen, 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, S., Cutini, D., Gasparrini, C., Pittori, P., Santolamazza, F., Verrecchia, P., Giommi, L. A., Antonelli, S., Colafrancesco, and L., Salotti

Subjects
Physics, High Energy Gamma-ray Astronomy, Active Galactic Nuclei, AGILE satellite, Photon, Astrophysics (astro-ph), Gamma ray, Spectral density, FOS: Physical sciences, Astronomy and Astrophysics, BL Lac S5 0716+714, Astrophysics, Light curve, law.invention, Space and Planetary Science, law, gamma rays: observations – galaxies: BL Lacertae objects: general – galaxies: BL Lacertae objects: individual: S5 0716+714, Blazar, Energy (signal processing), Flare, BL Lac object
Abstract

We report the gamma-ray activity from the intermediate BL Lac S5 0716+714 during observations acquired by the AGILE satellite in September and October 2007. These detections of activity were contemporaneous with a period of intense optical activity, which was monitored by GASP-WEBT. This simultaneous optical and gamma-ray coverage allows us to study in detail the light curves, time lags, gamma-ray photon spectrum, and Spectral Energy Distributions (SEDs) during different states of activity. AGILE observed the source with its two co-aligned imagers, the Gamma-Ray Imaging Detector (GRID) and the hard X-ray imager (Super-AGILE), which are sensitive to the 30 MeV-50 GeV and 18-60 keV energy ranges, respectively. Observations were completed in two different periods, the first between 2007 September 4-23, and the second between 2007 October 24-November 1. Over the period 2007 September 7-12, AGILE detected gamma-ray emission from the source at a significance level of 9.6-sigma with an average flux (E>100 MeV) of (97 +/- 15) x 10^{-8} photons cm^{-2} s^{-1}, which increased by a factor of at least four within three days. No emission was detected by Super-AGILE for the energy range 18-60 keV to a 3-sigma upper limit of 10 mCrab in 335 ksec. In October 2007, AGILE repointed toward S5 0716+714 following an intense optical flare, measuring an average flux of (47 +/- 11) x 10^{-8} photons cm^{-2} s^{-1} at a significance level of 6.0-sigma. The gamma-ray flux of S5 0716+714 detected by AGILE is the highest ever detected for this blazar and one of the most intense gamma-ray fluxes detected from a BL Lac object. The SED of mid-September appears to be consistent with the synchrotron self-Compton (SSC) emission model, but only by including two SSC components of different variabilities., 5 pages, 5 figures, accepted by A&A Letters 18/8/2008

Published
2008

18. AGILE detection of delayed gamma-ray emission from GRB 080514B

Author

Paolo Soffitta, Martino Marisaldi, A. Giuliani, A. Rappoldi, E. Vallazza, Francesco Longo, S. Cutini, Y. Evangelista, Andrea Rossi, I. G. Mitrofanov, K. L. Page, I. Donnarumma, A. W. Chen, C. Pittori, F. Perotti, Marco Feroci, Marco Tavani, Luigi Pacciani, Fulvio Gianotti, A. Pellizzoni, Sandro Mereghetti, P. W. Cattaneo, F. Fuschino, S. Vercellone, William V. Boynton, Kevin Hurley, E. Del Monte, Francesco Lazzarotto, A. Argan, Alessio Trois, Andrea Bulgarelli, Enrico Costa, P. A. Caraveo, P. Lipari, B. Preger, Paolo Esposito, Filippo D'Ammando, D. Zanello, G. Piano, M. Trifoglio, Guido Barbiellini, F. Fornari, M. Prest, G. Pucella, M. Fiorini, P. Santolamazza, Neil Gehrels, Massimo Rapisarda, M. Galli, Piergiorgio Picozza, F. Verrecchia, I. Lapshov, F. Boffelli, A. Morselli, David N. Burrows, L. Salotti, Claudio Labanti, G. Di Cocco, Giuliani A, Mereghetti S, Fornari F, Del Monte E, Feroci M, Marisaldi M, Esposito P, Perotti F, Tavani M, Argan A, Barbiellini G, Boffelli F, Bulgarelli A, Caraveo P, Cattaneo PW, Chen AW, Costa E, DAmmando F, Di Cocco G, Donnarumma I, Evangelista Y, Fiorini M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Longo F, Morselli A, Pacciani L, Pellizzoni A, Piano G, Picozza P, Prest M, Pucella G, Rapisarda M, Rappoldi A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Vercellone S, Zanello D, Salotti L, Cutini S, Pittori C, Preger B, Santolamazza P, Verrecchia F, Gehrels N, Page K, Burrows D, Rossi A, Hurley K, Mitrofanov I, Boynton W, A., Giuliani, S., Mereghetti, F., Fornari, E. D., Monte, M., Feroci, M., Marisaldi, P., Esposito, F., Perotti, M., Tavani, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A. W., Chen, E., Costa, F., D'Ammando, G. D., Cocco, I., Donnarumma, Y., Evangelista, M., Fiorini, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, A., Morselli, L., Pacciani, A., Pellizzoni, G., Piano, P., Picozza, M., Prest, G., Pucella, M., Rapisarda, A., Rappoldi, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, S., Vercellone, D., Zanello, L., Salotti, S., Cutini, C., Pittori, B., Preger, P., Santolamazza, F., Verrecchia, N., Gehrel, K., Page, D., Burrow, A., Rossi, K., Hurley, I., Mitrofanov, and W., Boynton

Subjects
Photon, gamma rays: bursts, Astrophysics::High Energy Astrophysical Phenomena, AGILE, satellite, GRB 080514B, X and gamma ray, Phase (waves), FOS: Physical sciences, Astrophysics, High Energy Gamma-ray Astronomy, law.invention, Telescope, law, Egret, Physics, biology, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, Dead time, biology.organism_classification, Gamma-ray Bursts, AGILE satellite, Space and Planetary Science, Gamma-ray Burst, Interplanetary spaceflight, Gamma-ray burst
Abstract

GRB 080514B is the first gamma ray burst (GRB), since the time of EGRET, for which individual photons of energy above several tens of MeV have been detected with a pair-conversion tracker telescope. This burst was discovered with the Italian AGILE gamma-ray satellite. The GRB was localized with a cooperation by AGILE and the interplanetary network (IPN). The gamma-ray imager (GRID) estimate of the position, obtained before the SuperAGILE-IPN localization, is found to be consistent with the burst position. The hard X-ray emission observed by SuperAGILE lasted about 7 s, while there is evidence that the emission above 30 MeV extends for a longer duration (at least ~13 s). Similar behavior was seen in the past from a few other GRBs observed with EGRET. However, the latter measurements were affected, during the brightest phases, by instrumental dead time effects, resulting in only lower limits to the burst intensity. Thanks to the small dead time of the AGILE/GRID we could assess that in the case of GRB 080514B the gamma-ray to X-ray flux ratio changes significantly between the prompt and extended emission phase., Comment: A&A letters, in press

Published
2008

19. AGILE detection of GeV $\sf$γ-ray emission from the SNR W28

Author

A. Giuliani, M. Tavani, A. Bulgarelli, E. Striani, S. Sabatini, M. Cardillo, Y. Fukui, A. Kawamura, A. Ohama, N. Furukawa, K. Torii, H. Sano, F. A. Aharonian, F. Verrecchia, A. Argan, G. Barbiellini, P. A. Caraveo, P. W. Cattaneo, A. W. Chen, V. Cocco, E. Costa, F. D'Ammando, E. Del Monte, G. De Paris, G. Di Cocco, I. Donnarumma, Y. Evangelista, M. Feroci, M. Fiorini, T. Froysland, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, Y. Lapshov, F. Lazzarotto, P. Lipari, F. Longo, M. Marisaldi, S. Mereghetti, A. Morselli, E. Moretti, L. Pacciani, A. Pellizzoni, F. Perotti, P. Picozza, M. Pilia, M. Prest, G. Pucella, M. Rapisarda, A. Rappoldi, P. Soffitta, M. Trifoglio, A. Trois, E. Vallazza, S. Vercellone, V. Vittorini, A. Zambra, D. Zanello, C. Pittori, P. Santolamazza, P. Giommi, S. Colafrancesco, L. Salotti, A., Giuliani, M., Tavani, A., Bulgarelli, E., Striani, S., Sabatini, M., Cardillo, Y., Fukui, A., Kawamura, A., Ohama, N., Furukawa, K., Torii, H., Sano, F. A., Aharonian, F., Verrecchia, A., Argan, G., Barbiellini, P. A., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, E., Costa, F., D'Ammando, E. D., Monte, G. D., Pari, G. D., Cocco, I., Donnarumma, Y., Evangelista, M., Feroci, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, Y., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, A., Morselli, E., Moretti, L., Pacciani, A., Pellizzoni, F., Perotti, P., Picozza, M., Pilia, M., Prest, G., Pucella, M., Rapisarda, A., Rappoldi, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, S., Vercellone, V., Vittorini, A., Zambra, D., Zanello, C., Pittori, P., Santolamazza, P., Giommi, S., Colafrancesco, L., Salotti, Giuliani A, Tavani M, Bulgarelli A, Striani E, Sabatini S, Cardillo M, Fukui Y, Kawamura A, Ohama A, Furukawa N, Torii K, Sano H, Aharonian FA, Verrecchia F, Argan A, Barbiellini G, Caraveo PA, Cattaneo PW, Chen AW, Cocco V, Costa E, DAmmando F, Del Monte E, De Paris G, Di Cocco G, Donnarumma I, Evangelista Y, Feroci M, Fiorini M, Froysland T, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov Y, Lazzarotto F, Lipari P, Longo F, Marisaldi M, Mereghetti S, Morselli A, Moretti E, Pacciani L, Pellizzoni A, Perotti F, Picozza P, Pilia M, Prest M, Pucella G, Rapisarda M, Rappoldi A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Vercellone S, Vittorini V, Zambra A, Zanello D, Pittori C, Santolamazza P, Giommi P, Colafrancesco S, and Salotti L

Subjects
Supernova Remnants, Supernova, Astrophysics::High Energy Astrophysical Phenomena, Hadron, acceleration of particles – diffusion – ISM: supernova remnants – gamma rays: ISM, FOS: Physical sciences, Flux, Cosmic ray, Astrophysics, AGILE, galactic cosmic rays, High Energy Gamma-ray Astronomy, Spectral line, law.invention, Telescope, law, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Molecular cloud, AGILE satellite, Gamma ray, Astronomy and Astrophysics, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Supernova remnants (SNRs) are believed to be the main sources of Galactic cosmic rays. Molecular clouds associated with SNRs can produce gamma-ray emission through the interaction of accelerated particles with the concentrated gas. The middle aged SNR W28, for its associated system of dense molecular clouds, provides an excellent opportunity to test this hypothesis. We present the AGILE/GRID observations of SNR W28, and compare them with observations at other wavelengths (TeV and 12CO J=1-->0 molecular line emission). The gamma-ray flux detected by AGILE from the dominant source associated with W28 is (14 +- 5) 10^-8 ph cm^-2 s^-1 for E > 400 MeV. This source is positionally well correlated with the TeV emission observed by the HESS telescope. The local variations of the GeV to TeV flux ratio suggest a difference between the CR spectra of the north-west and south molecular cloud complexes. A model based on a hadronic-induced interaction and diffusion with two molecular clouds at different distances from the W28 shell can explain both the morphological and spectral features observed by AGILE in the MeV-GeV energy range and by the HESS telescope in the TeV energy range. The combined set of AGILE and H.E.S.S. data strongly support a hadronic model for the gamma-ray production in W28., Accepted for publication in Astronomy & Astrophysics Letters

Published
2010
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