%0 Journal Article
%T The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
%+ Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%+ Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG)
%+ Centre d'étude spatiale des rayonnements (CESR)
%A A. Abdo, A.
%A Ackermann, Markus
%A Ajello, Marco
%A Antolini, E.
%A Baldini, Luca
%A Ballet, Jean
%A Barbiellini, Guido
%A Bastieri, D.
%A M. Baughman, B.
%A Bechtol, K.
%A Bellazzini, R.
%A Berenji, B.
%A D. Blandford, R.
%A D. Bloom, E.
%A Bonamente, E.
%A W. Borgland, A.
%A Bouvier, A.
%A Bregeon, J.
%A Brez, A.
%A Brigida, M.
%A Bruel, Pascal
%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 Charles, E.
%A Chekhtman, A.
%A C. Cheung, C.
%A Chiang, J.
%A Ciprini, S.
%A Claus, R.
%A Cohen-Tanugi, J.
%A Conrad, J.
%A Costamante, L.
%A Cutini, S.
%A D. Dermer, C.
%A de Angelis, A.
%A de Palma, F.
%A Do Couto E Silva, E.
%A S. Drell, P.
%A Dubois, R.
%A Dumora, D.
%A Farnier, C.
%A Favuzzi, C.
%A J. Fegan, S.
%A B. Focke, W.
%A Fukazawa, Y.
%A Funk, S.
%A Fusco, P.
%A Gargano, F.
%A Gasparrini, D.
%A Gehrels, N.
%A Germani, S.
%A Giglietto, N.
%A Giommi, P.
%A Giordano, F.
%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 E. Healey, S.
%A Horan, D.
%A E. Hughes, R.
%A Itoh, R.
%A Johannesson, G.
%A S. Johnson, A.
%A J. Johnson, T.
%A N. Johnson, W.
%A Kamae, T.
%A Katagiri, H.
%A Kataoka, J.
%A Kawai, N.
%A Knödlseder, Jürgen
%A Kuss, M.
%A Lande, J.
%A Latronico, L.
%A Lee, S.-H.
%A Lemoine-Goumard, M.
%A Llena Garde, M.
%A Longo, F.
%A Loparco, F.
%A Lott, B.
%A N. Lovellette, M.
%A Lubrano, P.
%A M. Madejski, G.
%A Makeev, A.
%A N. Mazziotta, M.
%A Mcconville, W.
%A E. Mcenery, J.
%A Meurer, C.
%A F. Michelson, P.
%A Mitthumsiri, W.
%A Mizuno, T.
%A Monte, C.
%A E. Monzani, M.
%A Morselli, A.
%A V. Moskalenko, I.
%A Murgia, S.
%A L. Nolan, P.
%A P. Norris, J.
%A Nuss, E.
%A Ohsugi, T.
%A Omodei, N.
%A Orlando, E.
%A F. Ormes, J.
%A Ozaki, M.
%A Paneque, D.
%A H. Panetta, J.
%A Parent, D.
%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 Ritz, S.
%A S. Rochester, L.
%A Y. Rodriguez, A.
%A W. Romani, R.
%A Roth, M.
%A F.-W. Sadrozinski, H.
%A Sander, A.
%A M. Saz Parkinson, P.
%A D. Scargle, J.
%A Sgro, C.
%A S. Shaw, M.
%A D. Smith, P.
%A Spandre, G.
%A Spinelli, P.
%A Starck, Jean-Luc
%A S. Strickman, M.
%A W. Strong, A.
%A J. Suson, D.
%A Tajima, H.
%A Takahashi, H.
%A Takahashi, T.
%A Tanaka, T.
%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 Uchiyama, Y.
%A L. Usher, T.
%A Vasileiou, V.
%A Vilchez, N.
%A Vitale, V.
%A P. Waite, A.
%A Wang, P.
%A L. Winer, B.
%A S. Wood, K.
%A Yang, Z.
%A Ylinen, T.
%A Ziegler, M.
%Z Version replaced to match the published one. Contact authors: M. Ajello and A. Tramacere
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 720
%P 435-453
%8 2010-09-01
%D 2010
%Z 1003.0895
%R 10.1088/0004-637X/720/1/435
%K cosmology: observations
%K diffuse radiation
%K galaxies: active
%K galaxies: jets
%K gamma rays: diffuse background
%K surveys
%Z 98.62.Py Distances, redshifts, radial velocities; spatial distribution of galaxies 98.54.Cm Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei
%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 This is the first of a series of papers aimed at characterizing the populations detected in the high-latitude sky of the {\it Fermi}-LAT survey. In this work we focus on the intrinsic spectral and flux properties of the source sample. We show that when selection effects are properly taken into account, {\it Fermi} sources are on average steeper than previously found (e.g. in the bright source list) with an average photon index of 2.40$\pm0.02$ over the entire 0.1--100\,GeV energy band. We confirm that FSRQs have steeper spectra than BL Lac objects with an average index of 2.48$\pm0.02$ versus 2.18$\pm0.02$. Using several methods we build the deepest source count distribution at GeV energies deriving that the intrinsic source (i.e. blazar) surface density at F$_{100}\geq10^{-9}$\,ph cm$^{-2}$ s$^{-1}$ is 0.12$^{+0.03}_{-0.02}$\,deg$^{-2}$. The integration of the source count distribution yields that point sources contribute 16$(\pm1.8)$\,\% ($\pm$7\,\% systematic uncertainty) of the GeV isotropic diffuse background. At the fluxes currently reached by LAT we can rule out the hypothesis that point-like sources (i.e. blazars) produce a larger fraction of the diffuse emission.
%G English
%Z Fermi-LAT
%L in2p3-00530044
%U https://hal.in2p3.fr/in2p3-00530044
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%~ OMP-CESR
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