Fermi Large Area Telescope Fourth Source Catalog

Abstract

Abstract We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ -ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this energy range. Relative to the 3FGL catalog, the 4FGL catalog has twice as much exposure as well as a number of analysis improvements, including an updated model for the Galactic diffuse γ -ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4 σ significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars.

Keywords

Affiliated Institutions

• Université Paris Cité FR
• George Washington University US
• Institut National de Physique Nucléaire et de Physique des Particules FR
• AlbaNova SE
• University of Padua IT
• Kavli Institute for Particle Astrophysics and Cosmology US
• KTH Royal Institute of Technology SE
• Istituto Nazionale di Fisica Nucleare, Sezione di Torino IT
• Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano IT
• Stellar Solutions (United States) US
• University of Turin IT
• Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata IT
• University of North Florida US
• Université de Montpellier FR
• CEA Paris-Saclay FR
• Sorbonne Paris Cité FR
• Sonoma State University US
• Universidad Autónoma de Madrid ES
• Centre National de la Recherche Scientifique FR
• Polytechnic University of Bari IT
• Friedrich-Alexander-Universität Erlangen-Nürnberg DE
• Nagoya University JP
• Osservatorio Astronomico di Padova IT
• Istituto di Radioastronomia di Bologna IT
• Astrophysique, Instrumentation et Modélisation FR
• University of Pisa IT
• University of Trieste IT
• Istituto Nazionale di Fisica Nucleare, Sezione di Padova IT
• Istituto Nazionale di Fisica Nucleare, Sezione di Bari IT
• Université Paris-Saclay FR
• Max Planck Institute for Physics DE
• Istituto Nazionale di Fisica Nucleare, Sezione di Pisa IT
• Commissariat à l'Énergie Atomique et aux Énergies Alternatives FR
• University of Würzburg DE
• Deutsches Elektronen-Synchrotron DESY DE
• Agenzia Spaziale Italiana IT
• United States Naval Research Laboratory US
• University of Johannesburg ZA
• Universidad Complutense de Madrid ES
• Fraunhofer Chalmers Research Centre for Industrial Mathematics SE
• École Polytechnique FR
• Hiroshima University JP
• Stockholm University SE
• RWTH Aachen University DE
• Istituto Nazionale di Fisica Nucleare, Sezione di Perugia IT
• Clemson University US
• University of Iceland IS
• University of Maryland, College Park US
• Délégation Paris 7 FR
• Istituto Nazionale di Fisica Nucleare, Sezione di Trieste IT
• Instituto de Astrofísica de Canarias ES
• Center for Astrophysics Harvard & Smithsonian US
• University of California, Santa Cruz US
• Stanford University US
• SLAC National Accelerator Laboratory US
• University of Perugia IT
• Laboratoire Leprince-Ringuet FR
• Laboratoire de Physique des deux infinis Bordeaux FR
• University of Washington US
• George Mason University US
• The University of Tokyo JP
• Dalarna University SE
• Goddard Space Flight Center US
• Laboratoire Univers et Particules de Montpellier FR

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