3FHL: The Third Catalog of Hard Fermi -LAT Sources

M. Ajello 1 W. Atwood 2 L. Baldini 3 Jean Ballet 4 G. Barbiellini 5 D. Bastieri 6 R. Bellazzini 4 E. Bissaldi 7 R Blandford 8 E. Bloom R. Bonino 9 J. Bregeon 10 R. Britto 11 Pascal Bruel 12 D. Paneque 13 S. Buson A. Cameron R. Caputo 2 M. Caragiulo 14 P. Caraveo E. Cavazzuti 15 C. Cecchi E. Charles A. Chekhtman 16 C. Cheung G. Chiaro 17 S. Ciprini 15 M. Cohen 18 D. Costantin F. Costanza 7 A. Cuoco 19 S. Cutini 15 F. D’ammando 20 F. De Palma R. Desiante 9 S. Digel 21 N. Di Lalla 22 M. Di Mauro 8 L. Di Venere 14 A. Domínguez P. Drell D. Dumora 23 C. Favuzzi 14 S. Fegan 12 E. Ferrara P. Fortin 12 A. Franckowiak 24 Y. Fukazawa S. Funk 25 P. Fusco 14 F. Gargano 7 D. Gasparrini 15 N. Giglietto 14 P. Giommi F. Giordano M. Giroletti 20 T. Glanzman D. Green A. Grenier 4 M. Grondin 23 E. Grove Lucas Guillemot 26, 27 S. Guiriec 11 K. Harding E. Hays W. Hewitt D. Horan 12 G. Jóhannesson 28 S. Kensei 29 M. Kuss 7 G. La Mura 6 S. Larsson L. Latronico 9 R. Buehler J. Li F. Longo F. Loparco 10 B. Lott 23 P. Lubrano 30 D. Magill S. Maldera 9 A. Manfreda 7 M. Mazziotta 14 E. Mcenery M. Meyer 31 P. Michelson 21 N. Mirabal 32 W. Mitthumsiri 33 T. Mizuno 34 A. Moiseev 32 M. Monzani 21 A. Morselli 35 I. V. Moskalenko 8 M. Negro E. Nuss 10 T. Ohsugi N. Omodei M. Orienti 36 E. Orlando 21 M. Palatiello S. Paliya M. Lemoine-Goumard 23 S. Perkins M. Persic 37 M. Pesce-Rollins 7 F. Piron 10 T. Porter G. Principe 38 S. Rainò 14 R. Rando 17 M. Razzano 22 S. Razzaque 39 A. Reimer O. Reimer T. Reposeur 23 M. Saz Parkinson C. Sgrò 12 D. Simone 14 E. Siskind 40 F. Spada 7 G. Spandre 7 P. Spinelli 14 L. Stawarz D. J. Suson M. Takahashi D. Tak G. Thayer J. B. Thayer 4 D. J. Thompson D. F. Torres 41 E. Torresi 42 E. Troja 32 G. Vianello K. Wood M. Wood
39 PPM Group [University of Johannesburg]
Department of Geology [University of Johannesburg]
Abstract : We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi-LAT Sources (3FHL), containing 1556 objects characterized in the 10 GeV–2 TeV energy range. The sensitivity and angular resolution are improved by factors of 3 and 2 relative to the previous LAT catalog at the same energies (1FHL). The vast majority of detected sources (79%) are associated with extragalactic counterparts at other wavelengths, including 16 sources located at very high redshift (z > 2). Eight percent of the sources have Galactic counterparts and 13% are unassociated (or associated with a source of unknown nature). The high-latitude sky and the Galactic plane are observed with a flux sensitivity of 4.4 to 9.5 ×10 −11 ph cm −2 s −1 , respectively (this is approximately 0.5 % and 1 % of the Crab Nebula flux above 10 GeV). The catalog includes 214 new γ-ray sources. The substantial increase in the number of photons (more than 4 times relative to 1FHL and 10 times to 2FHL) also allows us to measure significant spectral curvature for 32 sources and find flux variability for 163 of them. Furthermore, we estimate that for the same flux limit of 10 −12 erg cm −2 s −1 , the energy range above 10 GeV has twice as many sources as above 50 GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.
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Article dans une revue
Astrophysical Journal Supplement, American Astronomical Society, 2017, 232 (2), 18 p. 〈10.3847/1538-4365/aa8221〉
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M. Ajello, W. Atwood, L. Baldini, Jean Ballet, G. Barbiellini, et al.. 3FHL: The Third Catalog of Hard Fermi -LAT Sources. Astrophysical Journal Supplement, American Astronomical Society, 2017, 232 (2), 18 p. 〈10.3847/1538-4365/aa8221〉. 〈insu-01670475〉

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