A. ABDO, A.; ACKERMANN, Markus; AJELLO, Marco; ANTOLINI, E.; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; M. BAUGHMAN, B.; 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.; CELIK, O.; CHARLES, E.; CHEKHTMAN, A.; C. CHEUNG, C.; CHIANG, J.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONRAD, J.; COSTAMANTE, L.; CUTINI, S.; D. DERMER, C.; DE ANGELIS, A.; DE PALMA, F.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; DUMORA, D.; FARNIER, C.; FAVUZZI, C.; J. FEGAN, S.; B. FOCKE, W.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIGLIETTO, N.; GIOMMI, P.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; A. GRENIER, I.; E. GROVE, J.; GUIRIEC, S.; HADASCH, D.; HAYASHIDA, M.; HAYS, E.; E. HEALEY, S.; HORAN, D.; E. HUGHES, R.; ITOH, R.; JOHANNESSON, G.; S. JOHNSON, A.; J. JOHNSON, T.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; KAWAI, N.; KNÖDLSEDER, Jürgen; KUSS, M.; LANDE, J.; LATRONICO, L.; LEE, S.-H.; LEMOINE-GOUMARD, M.; LLENA GARDE, 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.; 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.; OZAKI, M.; PANEQUE, D.; H. PANETTA, J.; PARENT, D.; PELASSA, V.; PEPE, M.; PESCE-ROLLINS, M.; PIRON, F.; PORTER, T.A.; RAINO, S.; RANDO, R.; RAZZANO, M.; REIMER, A.; REIMER, O.; RITZ, S.; S. ROCHESTER, L.; Y. RODRIGUEZ, A.; W. ROMANI, R.; ROTH, M.; F.-W. SADROZINSKI, H.; SANDER, A.; M. SAZ PARKINSON, P.; D. SCARGLE, J.; SGRO, C.; S. SHAW, M.; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; STARCK, Jean-Luc; S. STRICKMAN, M.; W. STRONG, A.; 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.; VITALE, V.; P. WAITE, A.; WANG, P.; L. WINER, B.; S. WOOD, K.; YANG, Z.; YLINEN, T.; ZIEGLER, M.

doi:10.1088/0004-637X/720/1/435

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The Astrophysical Journal. 2010-09-01, vol. 720, p. 435-453

American Astronomical Society

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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.< Réduire

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cosmology: observations

diffuse radiation

galaxies: active

galaxies: jets

gamma rays: diffuse background

surveys

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The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background

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