A. ABDO, A.; ACKERMANN, Markus; AJELLO, Marco; B. ATWOOD, W.; AXELSSON, Magnus; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; BECHTOL, K.; BELLAZZINI, R.; BERENJI, B.; D. BLANDFORD, R.; D. BLOOM, E.; BONAMENTE, E.; W. BORGLAND, A.; BOUVIER, A.; BREGEON, J.; BREZ, A.; BRIGIDA, M.; BRUEL, Pascal; H. BURNETT, T.; BUSON, S.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; CARRIGAN, S.; M. CASANDJIAN, J.; CAVAZZUTI, E.; CECCHI, C.; ÇELIK, Ö.; CHARLES, E.; CHEKHTMAN, A.; C. CHEUNG, C.; CHIANG, J.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONRAD, J.; CUTINI, S.; D. DERMER, C.; DE ANGELIS, A.; DE PALMA, F.; W. DIGEL, S.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; DUMORA, D.; FARNIER, C.; FAVUZZI, C.; J. FEGAN, S.; B. FOCKE, W.; FORTIN, P.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIEBELS, B.; GIGLIETTO, N.; GIOMMI, P.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; A. GRENIER, I.; GRONDIN, M.-H.; E. GROVE, J.; GUILLEMOT, L.; GUIRIEC, S.; K. HARDING, A.; C. HARTMAN, R.; HAYASHIDA, M.; HAYS, E.; E. HEALEY, S.; HORAN, D.; E. HUGHES, R.; S. JACKSON, M.; JÓHANNESSON, G.; S. JOHNSON, A.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; KAWAI, N.; KERR, M.; KNÖDLSEDER, Jürgen; KUSS, M.; LANDE, J.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LONGO, F.; LOPARCO, F.; LOTT, B.; N. LOVELLETTE, M.; LUBRANO, P.; M. MADEJSKI, G.; MAKEEV, A.; N. MAZZIOTTA, M.; MCCONVILLE, W.; E. MCENERY, J.; MEURER, C.; F. MICHELSON, P.; MITTHUMSIRI, W.; MIZUNO, T.; A. MOISEEV, A.; MONTE, C.; E. MONZANI, M.; MORSELLI, A.; V. MOSKALENKO, I.; MURGIA, S.; L. NOLAN, P.; P. NORRIS, J.; NUSS, E.; OHSUGI, T.; OMODEI, N.; ORLANDO, E.; F. ORMES, J.; PANEQUE, D.; H. PANETTA, J.; PARENT, D.; PELASSA, V.; PEPE, M.; PERSIC, M.; PESCE-ROLLINS, M.; PIRON, F.; PORTER, T.A.; RAINÒ, S.; RANDO, R.; RAZZANO, M.; REIMER, A.; REIMER, O.; REPOSEUR, T.; RITZ, S.; S. ROCHESTER, L.; Y. RODRIGUEZ, A.; W. ROMANI, R.; ROTH, M.; RYDE, F.; F.-W. SADROZINSKI, H.; SANCHEZ, D.; SANDER, A.; M. SAZ PARKINSON, P.; D. SCARGLE, J.; SGRÒ, C.; J. SISKIND, E.; SMITH, David Stanley; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; TAKAHASHI, H.; TAKAHASHI, T.; TANAKA, T.; B. THAYER, J.; G. THAYER, J.; J. THOMPSON, D.; TIBALDO, L.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; L. USHER, T.; VASILEIOU, V.; VILCHEZ, N.; VILLATA, M.; VITALE, V.; P. WAITE, A.; WANG, P.; L. WINER, B.; S. WOOD, K.; YLINEN, T.; ZIEGLER, M.

doi:10.1088/0004-637X/710/2/1271

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The Astrophysical Journal. 2010-02-20, vol. 710, p. 1271-1285

American Astronomical Society

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The gamma-ray energy spectra of bright blazars of the LAT Bright AGN Sample (LBAS) are investigated using Fermi-LAT data. Spectral properties (hardness, curvature and variability) established using a data set accumulated over 6 months of operation are presented and discussed for different blazar classes and subclasses: Flat Spectrum Radio Quasars (FSRQs), Low-synchrotron peaked BLLacs (LSP-BLLacs), Intermediate-synchrotron peaked BLLacs (ISP-BLLacs) and High-synchrotron peaked BLLacs (HSP-BLLacs). The distribution of photon index (obtained from a power-law fit above 100 MeV) is found to correlate strongly with blazar subclass. The change in spectral index from that averaged over the six month observing period is < 0.2-0.3 when the flux varies by about an order of magnitude, with a tendency toward harder spectra when the flux is brighter for FSRQs and LSP-BLLacs. A strong departure from a single power-law spectrum appears to be a common feature for FSRQs. This feature is also present for some high-luminosity LSP-BLLacs, and a small number of ISP-BLLacs. It is absent in all LBAS HSP-BLLacs. For 3C 454.3 and AO 0235+164, the two brightest FSRQ source and LSP-BLLac source respectively, a broken power law gives the most acceptable of power law, broken power law, and curved forms. The consequences of these findings are discussed.< Réduire

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BL Lacertae objects: general

galaxies: active

galaxies: jets

gamma rays: general

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Spectral Properties of Bright Fermi-detected Blazars in the Gamma-ray Band

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