%0 Journal Article
%T Ferma gamma-ray space telescope observations of gamma-ray outburst from 3C 454.3 in 2009 december and 2010 april
%+ Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%+ Institut universitaire de France (IUF)
%+ Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG)
%+ Centre d'étude spatiale des rayonnements (CESR)
%A Ackermann, Markus
%A Ajello, Marco
%A Baldini, Luca
%A Ballet, Jean
%A Barbiellini, Guido
%A Bastieri, D.
%A Bechtol, K.
%A Bellazzini, R.
%A Berenji, B.
%A D. Blandford, R.
%A Bonamente, E.
%A W. Borgland, A.
%A Bregeon, J.
%A Brigida, M.
%A Bruel, Pascal
%A Buehler, R.
%A H. Burnett, T.
%A Buson, S.
%A A. Caliandro, G.
%A A. Cameron, R.
%A Caraveo, P. A.
%A Carrigan, S.
%A M. Casandjian, J.
%A Cavazzuti, E.
%A Cecchi, C.
%A Celik, O.
%A Chekhtman, A.
%A C. Cheung, C.
%A Chiang, J.
%A Ciprini, S.
%A Claus, R.
%A Cohen-Tanugi, J.
%A Corbel, S.
%A Cutini, S.
%A d'Ammando, F.
%A D. Dermer, C.
%A de Angelis, A.
%A de Palma, F.
%A W. Digel, S.
%A Do Couto E Silva, E.
%A S. Drell, P.
%A Dubois, R.
%A Dumora, D.
%A Escande, L.
%A Favuzzi, C.
%A J. Fegan, S.
%A C. Ferrara, E.
%A Fuhrmann, L.
%A Fukazawa, Y.
%A Fusco, P.
%A Gargano, F.
%A Gasparrini, D.
%A Gehrels, N.
%A Germani, S.
%A Giebels, B.
%A Giglietto, N.
%A Giommi, P.
%A Giordano, F.
%A Giroletti, M.
%A Glanzman, T.
%A Godfrey, G.
%A A. Grenier, I.
%A E. Grove, J.
%A Guiriec, S.
%A Hadasch, D.
%A Hayashida, M.
%A Hays, E.
%A Johannesson, G.
%A S. Johnson, A.
%A N. Johnson, W.
%A Kamae, T.
%A Katagiri, H.
%A Kataoka, J.
%A Knödlseder, Jürgen
%A Kuss, M.
%A Lande, J.
%A Larsson, S.
%A Latronico, L.
%A Lee, S.-H.
%A Llena Garde, M.
%A Longo, F.
%A Loparco, F.
%A Lott, B.
%A Lubrano, P.
%A M. Madejski, G.
%A Makeev, A.
%A Marchili, N.
%A N. Mazziotta, M.
%A E. Mcenery, J.
%A Mehault, J.
%A F. Michelson, P.
%A Mizuno, T.
%A Monte, C.
%A E. Monzani, M.
%A Morselli, A.
%A V. Moskalenko, I.
%A Murgia, S.
%A Nakamori, T.
%A Nalewajko, K.
%A Naumann-Godo, M.
%A L. Nolan, P.
%A P. Norris, J.
%A Nuss, E.
%A Ohsugi, T.
%A Okumura, A.
%A Omodei, N.
%A Orlando, E.
%A F. Ormes, J.
%A Pelassa, V.
%A Pepe, M.
%A Pesce-Rollins, M.
%A Piron, F.
%A Porter, T.A.
%A Raino, S.
%A Rando, R.
%A Razzano, M.
%A Reimer, A.
%A Reimer, O.
%A C. Reyes, L.
%A Ripken, J.
%A Ritz, S.
%A Roth, M.
%A F.-W. Sadrozinski, H.
%A Sanchez, D.
%A Sander, A.
%A D. Scargle, J.
%A Sgro, C.
%A Sikora, M.
%A J. Siskind, E.
%A Spandre, G.
%A Spinelli, P.
%A S. Strickman, M.
%A J. Suson, D.
%A Takahashi, H.
%A Takahashi, T.
%A Tanaka, T.
%A Tanaka, Y.
%A B. Thayer, J.
%A G. Thayer, J.
%A J. Thompson, D.
%A Tibaldo, L.
%A F. Torres, D.
%A Tosti, G.
%A Tramacere, A.
%A L. Usher, T.
%A Vandenbroucke, J.
%A Vilchez, N.
%A Vitale, V.
%A P. Waite, A.
%A Wang, P.
%A E. Wehrle, A.
%A L. Winer, B.
%A Yang, Z.
%A Ylinen, T.
%A Ziegler, M.
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 721
%P 1383-1396
%8 2010-10-01
%D 2010
%Z 1007.0483
%R 10.1088/0004-637X/721/2/1383
%K galaxies: active
%K gamma rays: galaxies
%K quasars: individual (3C 454.3)
%Z 98.70.Rz &ggr;-ray sources; &ggr;-ray bursts 98.62.Mw Infall, accretion, and accretion disks 98.54.Aj Quasars 98.62.Qz Magnitudes and colors; luminosities 95.85.Pw &ggr;-ray
%Z Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Journal articles
%X The flat spectrum radio quasar 3C 454.3 underwent an extraordinary outburst in 2009 December when it became the brightest γ-ray source in the sky for over 1 week. Its daily flux measured with the Fermi-Large Area Telescope at photon energies E>100 MeV reached F 100 = 22 ± 1 × 10–6 photon cm–2 s–1, representing the highest daily flux of any blazar ever recorded in high-energy γ-rays. It again became the brightest source in the sky in 2010 April, triggering a pointed-mode observation by Fermi. The correlated γ-ray temporal and spectral properties during these exceptional events are presented and discussed. The main results show flux variability over time scales less than 3 hr and very mild spectral variability with an indication of gradual hardening preceding major flares. The light curves during periods of enhanced activity in 2008 July-August and 2010 December show strong resemblance, with a flux plateau of a few days preceding the major flare. No consistent loop pattern emerged in the γ-ray spectral index versus the flux plane as would be expected in acceleration and cooling scenarios. The maximum energy of a photon from 3C 454.3 is ≈20 GeV and a minimum Doppler factor of ≈13 is derived. The γ-ray spectrum of 3C 454.3 shows a significant spectral break between ≈2 and 3 GeV that is very weakly dependent on the flux state, even when the flux changes by an order of magnitude.
%G English
%Z Fermi-LAT
%L in2p3-00530295
%U https://hal.in2p3.fr/in2p3-00530295
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