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Ajello, M.; Atwood, W. B.; Baldini, L.; Gonzalez, J. Becerra; Bellazzini, R.; Bissaldi, E.; Blandford, R. D.; Bloom, E. D.; Bottacini, E.; Brandt, T. J.; Bregeon, J.; Buehler, R.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caputo, R.; Caragiulo, M.; Caraveo, P. A.; Cavazzuti, E.; Charles, E.; Cheung, C. C.; Ciprini, S.; Cohen, J. M.; Cohen-Tanugi, J.; Conrad, J.; Cuoco, A.; Cutini, S.; D'Ammando, F.; Palma, F. de; Mauro, M. Di; Domínguez, A.; Drell, P. S.; Fegan, S. J.; Focke, W. B.; Franckowiak, A.; Funk, S.; Furniss, A. K.; Gargano, F.; Gasparrini, D.; Giglietto, N.; Giommi, P.; Giroletti, M.; Harding, A. K.; Hewitt, J. W.; Hill, A. B.; Horan, D.; Iafrate, G.; Hartmann, Dieter; Kamae, T.; Knödlseder, J.; Larsson, S.; Lemoine-Goumard, M.; Li, L.; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Maldera, S.; Manfreda, A.; Mayer, M.; Mazziotta, M. N.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Morselli, A.; Murgia, S.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orienti, M.; Orlando, E.; Perkins, J. S.; Pesce-Rollins, M.; Piron, F.; Pivato, G.; Porter, T. A.; Rando, R.; Razzaque, S.; Reimer, O.; Reposeur, T.; Romani, R. W.; Sánchez-Conde, M.; Parkinson, P. M. Saz; Schulz, A.; Sgrò, C.; Spandre, G.; Spinelli, P.; Suson, D. J.; Takahashi, H.; Takahashi, M.; Takahashi, T.; Thayer, J. B.; Tosti, G.; Troja, E.; Vianello, G.; Wood, K. S.; Wood, M.; Yassine, M.; Zimmer, S.
The Astrophysical journal. Supplement series, 01/2016, Letnik: 222, Številka: 1Journal Article
ABSTRACT We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in the 50 GeV-2 TeV energy range. In this energy band, Fermi-LAT has detected 360 sources, which constitute the second catalog of hard Fermi-LAT sources (2FHL). The improved angular resolution enables the precise localization of point sources (∼1 7 radius at 68% C. L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.
