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The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include: the National Aeronautics and Space Administration and the Department of Energy in the United States; the Commissariat a l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France; the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy; the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), High Energy Accelerator Research Organization (KEK), and Japan Aerospace Exploration Agency (JAXA) in Japan; and the K. A. Wallenberg Foundation, the Swedish Research Council, and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d'Etudes Spatiales in France. This work was performed in part under DOE Contract DE- AC02-76SF00515.r This research has made use of data obtained from the highenergy Astrophysics Science Archive Research Center (HEASARC) provided by NASA's Goddard Space Flight Center; the SIMBAD database operated at CDS, Strasbourg, France; and the NASA/IPAC Extragalactic Database (NED) operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of data archives, catalogs and software tools from the ASDC, a facility managed by the Italian Space Agency (ASI). Part of this work is based on the NVSS (NRAO VLA Sky Survey). The National Radio Astronomy Observatory is operated by Associated Universities, Inc., under contract with the National Science Foundation. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http://www.sdss.org/.The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions., The Participating Institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max-PlanckInstitute for Astrophysics (MPA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington.

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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope

Publicated to:ASTROPHYSICAL JOURNAL. 892 (2): 105- - 2020-04-01 892(2), DOI: 10.3847/1538-4357/ab791e

Authors: Ajello, M; Angioni, R; Axelsson, M; Ballet, J; Barbiellini, G; Bastieri, D; Becerra Gonzalez, J; Bellazzini, R; Bissaldi, E; Bloom, E D; Bonino, R; Bottacini, E; Bruel, P; Buson, S; Cafardo, F; Cameron, R A; Cavazzuti, E; Chen, S; Cheung, C C; Ciprini, S; Costantin, D; Cutini, S; D'Ammando, F; Luque, P de la Torre; de Menezes, R; de Palma, F; Desai, A; Di Lalla, N; Di Venere, L; Dominguez, A; Dirirsa, F Fana; Ferrara, E C; Finke, J; Franckowiak, A; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Garrappa, S; Gasparrini, D; Giglietto, N; Giordano, F; Giroletti, M; Green, D; Grenier, I A; Guiriec, S; Harita, S; Hays, E; Horan, D; Itoh, R; Johannesson, G; Kovac'evic', M; Krauss, F; Kreter, M; Kuss, M; Larsson, S; Leto, C; Li, J; Liodakis, I; Longo, F; Loparco, F; Lott, B; Lovellette, M N; Lubrano, P; Madejski, G M; Maldera, S; Manfreda, A; Marti-Devesa, G; Massaro, F; Mazziotta, M N; Mereu, I; Meyer, M; Migliori, G; Mirabal, N; Mizuno, T; Monzani, M E; Morselli, A; Moskalenko, I, V; Negro, M; Nemmen, R; Nuss, E; Ojha, L S; Ojha, R; Omodei, N; Orienti, M; Orlando, E; Ormes, J F; Paliya, V S; Pei, Z; Pena-Herazo, H; Persic, M; Pesce-Rollins, M; Petrov, L; Piron, F; Poon, H; Principe, G; Raino, S; Rando, R; Rani, B; Razzano, M; Razzaque, S; Reimer, A; Reimer, O; Schinzel, F K; Serini, D; Sgro, C; Siskind, E J; Spandre, G; Spinelli, P; Suson, D J; Tachibana, Y; Thompson, D J; Torres, D F; Torresi, E; Troja, E; Valverde, J; van Zyl, P; Yassine, M

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Abstract

The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains . It includes 85% more sources than the previous 3LAC catalog based on 4 yr of data. AGNs represent at least 79% of the high-latitude sources in the fourth Fermi-Large Area Telescope Source Catalog (4FGL), which covers the energy range from 50 MeV to 1 TeV. In addition, gamma-ray AGNs are found at low Galactic latitudes. Most of the 4LAC AGNs are blazars (98%), while the remainder are other types of AGNs. The blazar population consists of 24% Flat Spectrum Radio Quasars (FSRQs), 38% BL Lac-type objects, and 38% blazar candidates of unknown types (BCUs). On average, FSRQs display softer spectra and stronger variability in the gamma-ray band than BL Lacs do, confirming previous findings. All AGNs detected by ground-based atmospheric Cerenkov telescopes are also found in the 4LAC.

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