The Fermi-LAT high-latitude survey: Source count distributions and the origin of the extragalactic diffuse background
| Title: | The Fermi-LAT high-latitude survey: Source count distributions and the origin of the extragalactic diffuse background |
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| Authors: | Abdo AA; Ackermann M; Ajello M; Antolini E; Baldini L; Ballet J; Barbiellini G; Bastieri D; Baughman BM; Bechtol K; Bellazzini R; Berenji B; Blandford RD; Bloom ED; Bonamente E; Borgland AW; Bouvier A; Bregeon J; Brez A; Brigida M; Bruel P; Burnett TH; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Carrigan S; Casandjian JM; Cavazzuti E; Cecchi C; Celik O; Charles E; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cohen Tanugi J; Conrad J; Costamante L; Cutini S; Dermer CD; de Angelis A; de Palma F; Silva EDCE; Drell PS; Dubois R; Dumora D; Farnier C; FAVUZZI, Cecilia; Fegan SJ; Focke WB; Fukazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Gehrels N; Germani S; GIGLIETTO, Nicola; Giommi P; Giordano F; Glanzman T; Godfrey G; Grenier IA; Grove JE; Guiriec S; Hadasch D; Hayashida M; Hays E; Healey SE; Horan D; Hughes RE; Itoh R; Johannesson G; Johnson AS; Johnson TJ; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kawai N; Knodlseder J; Kuss M; Lande J; Latronico L; Lee SH; Lemoine Goumard M; Garde ML; Longo F; Loparco F; Lott B; Lovellette MN; Lurrano P; Madejski GM; Makeev A; Mazziotta MN; McConville W; McEnery JE; Meurer C; Michelson PF; Mitthumsiri W; Mizuno T; Monte C; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nolan PL; Norris JP; Nuss E; Ohsugi T; Omodei N; Orlando E; Ormes JF; Ozaki M; Paneque D; Panetta JH; Parent D; Pelassa V; Pepe M; Pesce Rollins M; Piron F; Porter TA; Raino S; Rando R; Razzan M; Reimer A; Reimer O; Ritz S; Rochester LS; Rodriguez AY; Romani RW; Roth M; Sadrozinski HFW; Sander A; Parkinson PMS; Scargle JD; Sgro C; Shaw MS; Smith PD; Spandre G; Spinelli P; Starck JL; Strickman MS; Strong AW; Suson DJ; Tajima H; Takahashi H; Takahashi T; Tanaka T; Thayer JB; Thayer JG; Thompson DJ; Tibaldo L; Torres DF; Tosti G; Tramacere A; Uchiyama Y; Usher TL; Vasileiou V; Vilchez N; Vitale V; Waite AP; Wang P; Winer BL; Wood KS; Yang Z; Ylinen T; Ziegler M. |
| Contributors: | Abdo, Aa; Ackermann, M; Ajello, M; Antolini, E; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Baughman, Bm; Bechtol, K; Bellazzini, R; Berenji, B; Blandford, Rd; Bloom, Ed; Bonamente, E; Borgland, Aw; Bouvier, A; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Burnett, Th; Buson, S; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Carrigan, S; Casandjian, Jm; Cavazzuti, E; Cecchi, C; Celik, O; Charles, E; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Conrad, J; Costamante, L; Cutini, S; Dermer, Cd; de Angelis, A; de Palma, F; Silva, Edce; Drell, P; Dubois, R; Dumora, D; Farnier, C; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giglietto, Nicola; Giommi, P; Giordano, F; Glanzman, T; Godfrey, G; Grenier, Ia; Grove, Je; Guiriec, S; Hadasch, D; Hayashida, M; Hays, E; Healey, Se; Horan, D; Hughes, Re; Itoh, R; Johannesson, G; Johnson, A; Johnson, Tj; Johnson, Wn; Kamae, T; Katagiri, H; Kataoka, J; Kawai, N; Knodlseder, J; Kuss, M; Lande, J; Latronico, L; Lee, Sh; Lemoine Goumard, M; Garde, Ml; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lurrano, P; Madejski, Gm; Makeev, A; Mazziotta, Mn; Mcconville, W; Mcenery, Je; Meurer, C |
| Publication Year: | 2010 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Cosmology: observation; diffuse radiation; galaxies: active; galaxies: jet; gamma rays: diffuse background; surveys |
| Description: | This is the first of a series of papers aimed at characterizing the populations detected in the high-latitude sky of the 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, Fermi sources are on average steeper than previously found (e.g., in the bright source list) with an average photon index of 2.40 +/- 0.02 over the entire 0.1-100 GeV energy band. We confirm that flat spectrum radio quasars have steeper spectra than BL Lacertae objects with an average index of 2.48 +/- 0.02 versus 2.18 +/- 0.02. 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) >= 10(-9) ph cm(2) s(-1) is 0.12(-0.02)(+0.03) deg(-2). The integration of the source count distribution yields that point sources contribute 16(+/- 1.8)% (+/- 7% systematic uncertainty) of the GeV isotropic diffuse background. At the fluxes currently reached by LAT, we can rule out the hypothesis that pointlike sources (i.e., blazars) produce a larger fraction of the diffuse emission. |
| Document Type: | article in journal/newspaper |
| File Description: | ELETTRONICO |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000281596000037; volume:720; issue:1; firstpage:435; lastpage:453; numberofpages:19; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11589/105 |
| DOI: | 10.1088/0004-637X/720/1/435 |
| Availability: | https://hdl.handle.net/11589/105; https://doi.org/10.1088/0004-637X/720/1/435 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.9DBA5D86 |
| Database: | BASE |