The Spectral Energy Distribution of Fermi bright blazars
Creators: name: Abdo, A. A.
name: Ackermann, M.
name: Ajello, M.
name: Axelsson, M.
name: Baldini, L.
name: Ballet, J.
name: Barbiellini, G.
name: Bastieri, D.
name: Baughman, B. M.
name: Bechtol, K.
name: Bellazzini, R.
name: Berenji, B.
name: Blandford, R. D.
name: Bloom, E. D.
name: Bonamente, E.
name: Borgland, A.
name: Bregeon, J.
name: Brez, A.
name: Brigida, M.
name: Bruel, P.
name: Burnett, T. H.
name: Buson, S.
name: Caliandro, G. A.
name: Cameron, R. A.
name: Caraveo, P. A.
name: Casandjian, J. M.
name: Cavazzuti, E.
name: Cecchi, C.
name: Celik, O.
name: Charles, E.
name: Chaty, S.
name: Chekhtman, A.
name: Chiang, J.
name: Ciprini, S.
name: Claus, R.
name: Cohen-Tanugi, J.
name: Colafrancesco, S.
name: Cominsky, L. R.
name: Conrad, J.
name: Costamante, L.
name: Cutini, S.
name: Dermer, C. D.
name: de Angelis, A.
name: de Palma, F.
name: Digel, S. W.
name: Silva, E. do Couto e
name: Drell, P. S.
name: Dubois, R.
name: Dumora, D.
name: Farnier, C.
name: Favuzzi, C.
name: Fegan, S. J.
name: Focke, W. B.
name: Fortin, P.
name: Frailis, M.
name: Fuhrmann, L.
name: Fukazawa, Y.
name: Funk, S.
name: Fusco, P.
name: Gargano, F.
name: Gasparrini, D.
name: Gehrels, N.
name: Germani, S.
name: Giebels, B.
name: Giglietto, N.
name: Giommi, P.
name: Giordano, F.
name: Glanzman, T.
name: Godfrey, G.
name: Grenier, I. A.
name: Grove, J. E.
name: Guillemot, L.
name: Guiriec, S.
name: Hadasch, D.
name: Hanabata, Y.
name: Harding, A. K.
name: Hayashida, M.
name: Hays, E.
name: Healey, S. E.
name: Horan, D.
name: Hughes, R. E.
name: Itoh, R.
name: Jackson, M. S.
name: Johannesson, G.
name: Johnson, A. S.
name: Johnson, W. N.
name: Kadler, M.
name: Kamae, T.
name: Katagiri, H.
name: Kataoka, J.
name: Kawai, N.
name: Kerr, M.
name: Knodlseder, J.
name: Kocian, M. L.
name: Kuss, M.
name: Lande, J.
name: Latronico, L.
name: Longo, F.
name: Loparco, F.
name: Lott, B.
name: Lovellette, M. N.
name: Lubrano, P.
name: Madejski, G. M.
name: Makeev, A.
name: Max-Moerbeck, W.
name: Mazziotta, M. N.
name: McConville, W.
name: McEnery, J. E.
name: Meurer, C.
name: Michelson, P. F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: (Abridged) We have conducted a detailed investigation of the broad-band spectral properties of the γ-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated Fermi gamma-ray spectra with Swift, radio, infra-red, optical and other hard X-ray/gamma-ray data, collected within three months of the LBAS data taking period, we were able to assemble high-quality and quasi-simultaneous Spectral Energy Distributions (SED) for 48 LBAS blazars.The SED of these gamma-ray sources is similar to that of blazars discovered at other wavelengths, clearly showing, in the usual Log $ν$ - Log $ν$ F$_ν$ representation, the typical broad-band spectral signatures normally attributed to a combination of low-energy synchrotron radiation followed by inverse Compton emission of one or more components. We have used these SEDs to characterize the peak intensity of both the low and the high-energy components. The results have been used to derive empirical relationships that estimate the position of the two peaks from the broad-band colors (i.e. the radio to optical and optical to X-ray spectral slopes) and from the gamma-ray spectral index. Our data show that the synchrotron peak frequency $ν_p^S$ is positioned between 10$^{12.5}$ and 10$^{14.5}$ Hz in broad-lined FSRQs and between $10^{13}$ and $10^{17}$ Hz in featureless BL Lacertae objects.We find that the gamma-ray spectral slope is strongly correlated with the synchrotron peak energy and with the X-ray spectral index, as expected at first order in synchrotron - inverse Compton scenarios. However, simple homogeneous, one-zone, Synchrotron Self Compton (SSC) models cannot explain most of our SEDs, especially in the case of FSRQs and low energy peaked (LBL) BL Lacs. (...)
description: 85 pages, 38 figures, submitted to ApJ