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2FHL: The Second Catalog of Hard Fermi -LAT Sources

M. Ackermann M. Ajello 1 William B. Atwood 2 L. Baldini J. Ballet 3, 4 Guido Barbiellini D. Bastieri J. Becerra Gonzalez R. Bellazzini E. Bissaldi R. D. Blandford E. D. Bloom R. Bonino E. Bottacini T. J. Brandt J. Bregeon Pascal Bruel 5 R. Buehler S. Buson G. A. Caliandro R. A. Cameron R. Caputo M. Caragiulo P. A. Caraveo E. Cavazzuti C. Cecchi E. Charles A. Chekhtman C. C. Cheung J. Chiang G. Chiaro S. Ciprini J. M. Cohen J. Cohen-Tanugi 6 L. R. Cominsky J. Conrad A. Cuoco S. Cutini F. D’ammando A. De Angelis F. De Palma R. Desiante M. Di Mauro L. Di Venere A. Domínguez P. S. Drell C. Favuzzi S. J. Fegan E. C. Ferrara W. B. Focke P. Fortin 7 A. Franckowiak Y. Fukazawa S. Funk A. K. Furniss P. Fusco 8 F. Gargano D. Gasparrini N. Giglietto P. Giommi F. Giordano M. Giroletti 9 T. Glanzman G. Godfrey I. A. Grenier 4, 3 M.-H. Grondin 10 Lucas Guillemot 11, 12 S. Guiriec A. K. Harding 13 E. Hays J. W. Hewitt A. B. Hill D. Horan 5 G. Iafrate Dieter Hartmann T. Jogler G. Jóhannesson A. S. Johnson T. Kamae J. Kataoka J. Knödlseder M. Kuss 14 G. La Mura S. Larsson L. Latronico M. Lemoine-Goumard J. Li L. Li F. Longo F. Loparco B. Lott 10 M. N. Lovellette P. Lubrano G. M. Madejski S. Maldera A. Manfreda M. Mayer M. N. Mazziotta P. F. Michelson N. Mirabal W. Mitthumsiri T. Mizuno A. A. Moiseev M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia E. Nuss 6 T. Ohsugi N. Omodei M. Orienti E. Orlando J. F. Ormes D. Paneque J. S. Perkins M. Pesce-Rollins V. Petrosian F. Piron 6 G. Pivato T. A. Porter S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer T. Reposeur 10 R. W. Romani M. Sánchez-Conde P. M. Saz Parkinson 2 J. Schmid A. Schulz C. Sgrò E. J. Siskind F. Spada G. Spandre P. Spinelli D. J. Suson H. Tajima H. Takahashi 15 M. Takahashi T. Takahashi J. B. Thayer D. J. Thompson L. Tibaldo D. F. Torres G. Tosti E. Troja G. Vianello K. S. Wood 16 M. Wood M. Yassine G. Zaharijas S. Zimmer
1 Stanford University
2 SCIPP - Santa Cruz Institute for Particle Physics
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
5 LLR - Laboratoire Leprince-Ringuet
6 LUPM - Laboratoire Univers et Particules de Montpellier
7 CfA - Harvard-Smithsonian Center for Astrophysics
8 INFN, sezione di Bari - Istituto Nazionale di Fisica Nucleare, sezione di Bari
9 INAF - Istituto Nazionale di Astrofisica
10 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
11 USN - Unité Scientifique de la Station de Nançay
12 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
13 GFSC Astrophysics Science Division
14 Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
15 Hiroshima University
16 NRL - Naval Research Laboratory
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 (~1farcm7 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.
Keywords : gamma rays: general catalogs
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M. Ackermann, M. Ajello, William B. Atwood, L. Baldini, J. Ballet, et al.. 2FHL: The Second Catalog of Hard Fermi -LAT Sources. Astrophysical Journal Supplement, American Astronomical Society, 2016, 222 (1), ⟨10.3847/0067-0049/222/1/5⟩. ⟨insu-01360302⟩

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