Data di Pubblicazione:
2015
Abstract:
We present the third Fermi Large Area Telescope (LAT) source catalog (3FGL) of sources in the 100 MeV–
300 GeV range. Based on the first 4 yr of science data from the Fermi Gamma-ray Space Telescope mission, it is
the deepest yet in this energy range. Relative to the Second Fermi LAT catalog, the 3FGL catalog incorporates
twice as much data, as well as a number of analysis improvements, including improved calibrations at the event
reconstruction level, an updated model for Galactic diffuse γ-ray emission, a refined procedure for source
detection, and improved methods for associating LAT sources with potential counterparts at other wavelengths.
The 3FGL catalog includes 3033 sources above 4σ significance, with source location regions, spectral properties,
and monthly light curves for each. Of these, 78 are flagged as potentially being due to imperfections in the model
for Galactic diffuse emission. Twenty-five sources are modeled explicitly as spatially extended, and overall 238
sources are considered as identified based on angular extent or correlated variability (periodic or otherwise)
observed at other wavelengths. For 1010 sources we have not found plausible counterparts at other wavelengths.
More than 1100 of the identified or associated sources are active galaxies of the blazar class; several other classes
of non-blazar active galaxies are also represented in the 3FGL. Pulsars represent the largest Galactic source class.
From source counts of Galactic sources we estimate that the contribution of unresolved sources to the Galactic
diffuse emission is ∼3% at 1 GeV.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
gamma-rays: general
Elenco autori:
Acero, F.; Ackermann, M.; Ajello, M.; Albert, A.; Atwood, W.B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Belfiore, A.; Bellazzini, R.; Bissaldi, E.; Blandford, R.D.; Bloom, E.D.; Bogart, J.R.; Bonino, R.; Bottacini, E.; Bregeon, J.; Britto, R.J.; Bruel, P.; Buehler, R.; Burnett, T.H.; Buson, S.; Caliandro, G.A.; Cameron, R.A.; Caputo, R.; Caragiulo, M.; Caraveo, P.A.; Casandjian, J.M.; Cavazzuti, E.; Charles, E.; Chaves, R.C.G.; Chekhtman, A.; Cheung, C.C.; Chiang, J.; Chiaro, G.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Cominsky, L.R.; Conrad, J.; Cutini, S.; D'Ammando, F.; Angelis, A. De; Deklotz, M.; Palma, F. De; Desiante, R.; Digel, S.W.; Venere, L. Di; Drell, P.S.; Dubois, R.; Dumora, D.; Favuzzi, C.; Fegan, S.J.; Ferrara, E.C.; Finke, J.; Franckowiak, A.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gasparrini, D.; Giebels, B.; Giglietto, N.; Giommi, P.; Giordano, F.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Grenier, I.A.; Grondin, M.-H.; Grove, J.E.; Guillemot, L.; Guiriec, S.; Hadasch, D.; Harding, A.K.; Hays, E.; Hewitt, J.W.; Hill, A.B.; Horan, D.; Iafrate, G.; Jogler, T.; Jóhannesson, G.; Johnson, R.P.; Johnson, A.S.; Johnson, T.J.; Johnson, W.N.; Kamae, T.; Kataoka, J.; Katsuta, J.; Kuss, M.; Mura, G. La; Landriu, D.; Larsson, S.; Latronico, L.; Lemoine-Goumard, M.; Li, J.; Li, L.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M.N.; Lubrano, P.; Madejski, G.M.; Massaro, F.; Mayer, M.; Mazziotta, M.N.; Mcenery, J.E.; Michelson, P.F.; Mirabal, N.; Mizuno, T.; Moiseev, A.A.; Mongelli, M.; Monzani, M.E.; Morselli, A.; Moskalenko, I.V.; Murgia, S.; Nuss, E.; Ohno, M.; Ohsugi, T.; Omodei, N.; Orienti, M.; Orlando, E.; Ormes, J.F.; Paneque, D.; Panetta, J.H.; Perkins, J.S.; Pesce-Rollins, M.; Piron, F.; Pivato, G.; Porter, T.A.; Racusin, J.L.; Rando, R.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Reposeur, T.; Rochester, L.S.; Romani, R.W.; Salvetti, D.; Sánchez-Conde, M.; Parkinson, P. M. Saz; Schulz, A.; Siskind, E.J.; Smith, D.A.; Spada, F.; Spandre, G.; Spinelli, P.; Stephens, T.E.; Strong, A.W.; Suson, D.J.; Takahashi, H.; Takahashi, T.; Tanaka, Y.; Thayer, J.G.; Thayer, J.B.; Thompson, D.J.; Tibaldo, L.; Tibolla, O.; Torres, D.F.; Torresi, E.; Tosti, G.; Troja, E.; Klaveren, B. Van; Vianello, G.; Winer, B.L.; Wood, K.S.; Wood, M.; Zimmer, S.
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