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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.

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Fermi Large Area Telescope Fourth Source Catalog

Publicated to:Astrophysical Journal Supplement Series. 247 (1): 33- - 2020-03-01 247(1), DOI: 10.3847/1538-4365/ab6bcb

Authors: Abdollahi, S; Acero, F; Ackermann, M; Ajello, M; Atwood, W B; Axelsson, M; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Becerra Gonzalez, J; Bellazzini, R; Berretta, A; Bissaldi, E; Blandford, R D; Bloom, E D; Bonino, R; Bottacini, E; Brandt, T J; Bregeon, J; Bruel, P; Buehler, R; Burnett, T H; Buson, S; Cameron, R A; Caputo, R; Caraveo, P A; Casandjian, J M; Castro, D; Cavazzuti, E; Charles, E; Chaty, S; Chen, S; Cheung, C C; Chiaro, G; Ciprini, S; Cohen-Tanugi, J; Cominsky, L R; Coronado-Blazquez, J; Costantin, D; Cuoco, A; Cutini, S; D'Ammando, F; DeKlotz, M; Luque, P de la Tone; de Palma, F; Desai, A; Digel, S W; Di Lalla, N; Di Mauro, M; Di Venere, L; Dominguez, A; Dumora, D; Dirirsa, F Fana; Fegan, S J; Ferrara, E C; Franckowiak, A; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gaspanini, D; Giglietto, N; Giommi, P; Giordano, F; Giroletti, M; Glanzman, T; Green, D; Grenier, I A; Griffin, S; Grondin, M-H; Grove, J E; Guiriec, S; Harding, A K; Hayashi, K; Hays, E; Hewitt, J W; Horan, D; Johannesson, G; Johnson, T J; Kamae, T; Kerr, M; Kocevski, D; Kovac'evic, M; Kuss, M; Landriu, D; Larsson, S; Latronico, L; Lemoine-Goumard, M; Li, J; Liodakis, I; Longo, F; Loparco, F; Lott, B; Lovellette, M N; Lubrano, P; Madejski, G M; Maldera, S; Malyshev, D; Manfreda, A; Marchesini, J; Marcotulli, L; Marti-Devesa, G; Martin, P; Massaro, F; Mazziotta, M N; McEnery, J E; Mereu, I; Meyer, M; Michelson, P F; Mirabal, N; Mizuno, T; Monzani, M E; Morselli, A; Moskalenko, I, V; Negro, M; Nuss, E; Ojha, R; Omodei, N; Orienti, M; Orlando, E; Ormes, J F; Palatiello, M; Paliya, V S; Paneque, D; Pei, Z; Pena-Herazo, H; Perkins, J S; Persic, M; Pesce-Rollms, M; Petrosian, V; Petrov, L; Piron, F; Poon, H; Porter, T A; Principe, G; Raino, S; Rando, R; Razzano, M; Razzaque, S; Reimer, A; Reimer, O; Remy, Q; Reposeur, T; Romani, R W; Parkinson, P M Saz; Schinzel, F K; Serini, D; Sgro, C; Siskind, E J; Smith, D A; Spandre, G; Spinelli, P; Strong, A W; Suson, D J; Tajima, H; Takahashi, M N; Tak, D; Thayer, J B; Thompson, D J; Tibaldo, L; Torres, D F; Torresi, E; Valverde, J; Van Klaveren, B; van Zyl, P; Wood, K; Yassine, M; Zaharijas, G

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Abstract

We present the fourth Fermi Large Area Telescope catalog (4FGL) of gamma-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 gamma-ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4 sigma 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.

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