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 Pascal Bruel 11 D. Paneque 12 S. Buson A. Cameron R. Caputo 2 M. Caragiulo 13 P. Caraveo E. Cavazzuti 14 C. Cecchi E. Charles A. Chekhtman 15 C. Cheung G. Chiaro 16 S. Ciprini 14 M. Cohen 17 D. Costantin F. Costanza 7 A. Cuoco 18 S. Cutini 14 F. D’ammando 19 F. de Palma R. Desiante 9 S. Digel 20 N. Di Lalla 21 M. Di Mauro 8 L. Di Venere 13 A. Domínguez P. Drell D. Dumora 22 C. Favuzzi 13 S. Fegan 11 E. Ferrara P. Fortin 11 A. Franckowiak 23 Y. Fukazawa S. Funk 24 P. Fusco 13 F. Gargano 7 D. Gasparrini 14 N. Giglietto 13 P. Giommi F. Giordano M. Giroletti 19 T. Glanzman D. Green A. Grenier 4 M. Grondin 22 E. Grove Lucas Guillemot 25, 26 S. Guiriec K. Harding E. Hays W. Hewitt D. Horan 11 G. Jóhannesson 27 S. Kensei 28 M. Kuss 7 G. La Mura 6 S. Larsson L. Latronico 9 R. Buehler J. Li F. Longo F. Loparco 10 B. Lott 22 P. Lubrano 29 D. Magill S. Maldera 9 A. Manfreda 7 M. Mazziotta 13 E. Mcenery M. Meyer 30 P. Michelson 20 N. Mirabal 31 W. Mitthumsiri 32 T. Mizuno 33 A. Moiseev 31 M. Monzani 20 A. Morselli 34 I. V. Moskalenko 8 M. Negro E. Nuss 10 T. Ohsugi N. Omodei M. Orienti 35 E. Orlando 20 M. Palatiello S. Paliya M. Lemoine-Goumard 22 S. Perkins M. Persic 36 M. Pesce-Rollins 7 F. Piron 10 T. Porter G. Principe 24 S. Rainò 13 R. Rando 16 M. Razzano 21 S. Razzaque 37 A. Reimer O. Reimer T. Reposeur 22 M. Saz Parkinson C. Sgrò 11 D. Simone 13 E. Siskind 38 F. Spada 7 G. Spandre 7 P. Spinelli 13 L. Stawarz D. J. Suson M. Takahashi D. Tak G. Thayer J. B. Thayer 4 D. J. Thompson D. F. Torres 39 E. Torresi 40 E. Troja 31 G. Vianello K. Wood M. Wood
37 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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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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