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

Ajello M, Atwood WB, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bregeon J, Britto RJ, Bruel P, Buehler R, Buson S, Cameron RA, Caputo R, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Cheung CC, Chiaro G, Ciprini S, Cohen JM, Costantin D, Costanza F, Cuoco A, Cutini S, D'Ammando F, De Palma F, Desiante R, Digel SW, Di Lalla N, Di Mauro M, Di Venere L, Dominguez A, Drell PS, Dumora D, Favuzzi C, Fegan SJ, Ferrara EC, Fortin P, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Green D, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Harding AK, Hays E, Hewitt JW, Horan D, Johannesson G, Kensei S, Kuss M, La Mura G, Larsson S, Latronico L, Lemoine-Goumard M, Li J, Longo F, Loparco F, Lott B, Lubrano P, Magill JD, Maldera S, Manfreda A, Mazziotta MN, Mcenery JE, Meyer M, Michelson PF, Mirabal N, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Moskalenko IV, Negro M, Nuss E, Ohsugi T, Omodei N, Orienti M, Orlando E, Palatiello M, Paliya VS, Paneque D, Perkins JS, Persic M, Pesce-Rollins M, Piron F, Porter TA, Principe G, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Parkinson PMS, Sgro C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Stawarz L, Suson DJ, Takahashi M, Tak D, Thayer JG, Thayer JB, Thompson DJ, Torres DF, Torresi E, Troja E, Vianello G, Wood K, Wood M (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Book Volume: 232

Journal Issue: 2

DOI: 10.3847/1538-4365/aa8221

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). Of the sources, 8% 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 x 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 gamma-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 the range above 50 GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.

Authors with CRIS profile

Involved external institutions

University of the Free State South Africa (ZA) Deutsches Elektronen-Synchrotron DESY Germany (DE) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) University of Pisa / Università di Pisa (UniPi) Italy (IT) Stanford University United States (USA) (US) University of California Santa Cruz United States (USA) (US) École Polytechnique - Université Paris-Saclay France (FR) Politecnico di Bari Italy (IT) University of Montpellier / Université Montpellier France (FR) Université Bordeaux 1, Sciences et Technologies France (FR) Institute of Space Science (ISS) / Institutul de Științe Spațiale Romania (RO) Italian Space Agency / Agenzia Spaziale Italiana (ASI) Italy (IT) AlbaNova University Centre / Kungliga Tekniska Högskolan AlbaNova Universitetscentrum Sweden (SE) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) National Aeronautics and Space Administration (NASA) United States (USA) (US) U.S. Naval Research Laboratory United States (USA) (US) University of North Florida (UNF) United States (USA) (US) Universidad Complutense de Madrid (UCM) Spain (ES) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) University of Johannesburg South Africa (ZA) University of Padua / Universita degli Studi di Padova Italy (IT) Max-Planck-Institut für Physik (Werner-Heisenberg-Institut, MPP) / Max Planck Institute for Physics Germany (DE) Hiroshima University Japan (JP) NYCB Real-Time Computing, Inc. United States (USA) (US) George Mason University United States (USA) (US) University of Iceland (UI) / Háskóli Íslands Iceland (IS) Purdue University Northwest / Purdue University Calumet United States (USA) (US) Jagiellonian University / Uniwersytet Jagielloński (UJ) Poland (PL) University of Maryland United States (USA) (US) Clemson University United States (USA) (US) Harvard University United States (USA) (US) Mahidol University / มหาวิทยาลัยมหิดล Thailand (TH) Praxis, Inc. United States (USA) (US) University of Orléans / Université d'Orléans France (FR)

How to cite

APA:

Ajello, M., Atwood, W.B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D.,... Wood, M. (2017). 3FHL: The Third Catalog of Hard Fermi-LAT Sources. Astrophysical Journal Supplement Series, 232(2). https://doi.org/10.3847/1538-4365/aa8221

MLA:

Ajello, Marco, et al. "3FHL: The Third Catalog of Hard Fermi-LAT Sources." Astrophysical Journal Supplement Series 232.2 (2017).

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