Fermi Large Area Telescope Fourth Source Catalog

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

doi:10.3847/1538-4365/ab6bcb

Fermi Large Area Telescope Fourth Source Catalog

S. Abdollahi
, F. Acero
, M. Ackermann
, M. Ajello
, W. B. Atwood
, M. Axelsson
, L. Baldini
, J. Ballet
, G. Barbiellini
, D. Bastieri
, J. Becerra Gonzalez
, R. Bellazzini
, A. Berretta
, E. Bissaldi
, R. D. Blandford
, E. D. Bloom
, R. Bonino
, E. Bottacini
, T. J. Brandt
, J. Bregeon

P. Bruel, R. Buehler, T. H. Burnett, S. Buson, R. A. Cameron, R. Caputo, P. A. Caraveo, J. M. Casandjian, D. Castro, E. Cavazzuti, E. Charles, S. Chaty, S. Chen, C. C. Cheung, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, L. R. Cominsky, J. Coronado-Blázquez, D. Costantin, A. Cuoco, S. Cutini, F. D'Ammando, M. Deklotz, P. De La Torre Luque, F. De Palma, A. Desai, S. W. Digel, N. Di Lalla, M. Di Mauro, L. Di Venere, A. Domínguez, D. Dumora, F. Fana Dirirsa, S. J. Fegan, E. C. Ferrara, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, D. Green, I. A. Grenier, S. Griffin, M. H. Grondin, J. E. Grove, S. Guiriec, A. K. Harding, K. Hayashi, E. Hays, J. W. Hewitt, D. Horan, G. Jóhannesson, T. J. Johnson, T. Kamae, M. Kerr, D. Kocevski, M. Kovac'evic', M. Kuss, D. Landriu, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, I. Liodakis, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, S. Maldera, D. Malyshev, A. Manfreda, E. J. Marchesini, L. Marcotulli, G. Martí-Devesa, P. Martin, F. Massaro, M. N. Mazziotta, J. E. McEnery, I. Mereu, M. Meyer, P. F. Michelson, N. Mirabal, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, M. Negro, E. Nuss, R. Ojha, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, M. Palatiello, V. S. Paliya, D. Paneque, Z. Pei, H. Peña-Herazo, J. S. Perkins, M. Persic, M. Pesce-Rollins, V. Petrosian, L. Petrov, F. Piron, H. Poon, T. A. Porter, G. Principe, S. Rain, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, Q. Remy, T. Reposeur, R. W. Romani, P. M.Saz Parkinson, F. K. Schinzel, D. Serini, C. Sgr, E. J. Siskind, D. A. Smith, G. Spandre, P. Spinelli, A. W. Strong, D. J. Suson, H. Tajima, M. N. Takahashi, D. Tak, J. B. Thayer, D. J. Thompson, L. Tibaldo, D. F. Torres, E. Torresi, J. Valverde, B. Van Klaveren, P. Van Zyl, K. Wood, M. Yassine, G. Zaharijas

Physics

Hiroshima University
Université Paris Diderot
German Electron Synchrotron
Clemson University
University of California at Santa Cruz
Stockholm University
KTH Royal Institute of Technology
University of Pisa
National Institute for Nuclear Physics
University of Trieste
University of Padua
Instituto de Astrofísica de Canarias
NASA Goddard Space Flight Center
University of Maryland
University of Perugia
Polytechnic University of Bari
SLAC National Accelerator Laboratory
University of Turin
Université Montpellier 2
Laboratoire Leprince-Ringuet
University of Washington
University of Würzburg
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
Harvard & Smithsonian
Italian Space Agency
Naval Research Laboratory
Sonoma State University
Universidad Autónoma de Madrid
RWTH Aachen University
National Institute for Astrophysics
Stellar Solutions Inc.
Complutense University
Centre d'Etudes Nucléaires Bordeaux-Gradingnan (CENBG)
University of Johannesburg
Friedrich-Alexander University Erlangen-Nürnberg
Max Planck Institute for Physics (Werner Heisenberg Institute)
George Washington University
Nagoya University
University of North Florida
University of Iceland
George Mason University
The University of Tokyo
Oskar Klein Centre
Dalarna University
University of Innsbruck
IRAP
Istituto Nazionale di Astrofisica-Osservatorio Astrofisico di Torino
University of Maryland Baltimore County
University of Denver
Instituto Nacional de Astrofisica Optica y Electronica
Osservatorio Astronomico di Trieste
The University of Hong Kong
National Science Foundation
University of New Mexico
NYCB Real-Time Computing Inc.
Max Planck Institute for Extraterrestrial Physics
Purdue University Northwest
Autonomous University of Barcelona
ICREA
National Research Foundation
University of the Witwatersrand
Square Kilometre Array
University of Nova Gorica

Research output: Contribution to journal › Article › peer-review

1230 Citations (Scopus)

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 4σ 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.

Original language	English
Article number	33
Journal	Astrophysical Journal, Supplement Series
Volume	247
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/ab6bcb
Publication status	Published - Mar 2020

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4365/ab6bcb

Cite this

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., ... Zaharijas, G. (2020). Fermi Large Area Telescope Fourth Source Catalog. Astrophysical Journal, Supplement Series, 247(1), Article 33. https://doi.org/10.3847/1538-4365/ab6bcb

@article{be8a888abce548db80b5a3a77974c2ce,

title = "Fermi Large Area Telescope Fourth Source Catalog",

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 4σ 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.",

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

year = "2020",

month = mar,

doi = "10.3847/1538-4365/ab6bcb",

language = "English",

volume = "247",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "American Astronomical Society",

number = "1",

}

Abdollahi, S, Acero, F, Ackermann, M, Ajello, M, Atwood, WB, Axelsson, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Becerra Gonzalez, J, Bellazzini, R, Berretta, A, Bissaldi, E, Blandford, RD, Bloom, ED, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Burnett, TH, Buson, S, Cameron, RA, Caputo, R, Caraveo, PA, Casandjian, JM, Castro, D, Cavazzuti, E, Charles, E, Chaty, S, Chen, S, Cheung, CC, Chiaro, G, Ciprini, S, Cohen-Tanugi, J, Cominsky, LR, Coronado-Blázquez, J, Costantin, D, Cuoco, A, Cutini, S, D'Ammando, F, Deklotz, M, Torre Luque, PDL, De Palma, F, Desai, A, Digel, SW, Lalla, ND, Mauro, MD, Venere, LD, Domínguez, A, Dumora, D, Dirirsa, FF, Fegan, SJ, Ferrara, EC, 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, Griffin, S, Grondin, MH, Grove, JE, Guiriec, S, Harding, AK, Hayashi, K, Hays, E, Hewitt, JW, Horan, D, Jóhannesson, G, Johnson, TJ, 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, MN, Lubrano, P, Madejski, GM, Maldera, S, Malyshev, D, Manfreda, A, Marchesini, EJ, Marcotulli, L, Martí-Devesa, G, Martin, P, Massaro, F, Mazziotta, MN, McEnery, JE, Mereu, I, Meyer, M, Michelson, PF, Mirabal, N, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Negro, M, Nuss, E, Ojha, R, Omodei, N, Orienti, M, Orlando, E, Ormes, JF, Palatiello, M, Paliya, VS, Paneque, D, Pei, Z, Peña-Herazo, H, Perkins, JS, Persic, M, Pesce-Rollins, M, Petrosian, V, Petrov, L, Piron, F, Poon, H, Porter, TA, Principe, G, Rain, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Remy, Q, Reposeur, T, Romani, RW, Parkinson, PMS, Schinzel, FK, Serini, D, Sgr, C, Siskind, EJ, Smith, DA, Spandre, G, Spinelli, P, Strong, AW, Suson, DJ, Tajima, H, Takahashi, MN, Tak, D, Thayer, JB, Thompson, DJ, Tibaldo, L, Torres, DF, Torresi, E, Valverde, J, Klaveren, BV, Zyl, PV, Wood, K, Yassine, M & Zaharijas, G 2020, 'Fermi Large Area Telescope Fourth Source Catalog', Astrophysical Journal, Supplement Series, vol. 247, no. 1, 33. https://doi.org/10.3847/1538-4365/ab6bcb

TY - JOUR

T1 - Fermi Large Area Telescope Fourth Source Catalog

AU - Abdollahi, S.

AU - Acero, F.

AU - Ackermann, M.

AU - Ajello, M.

AU - Atwood, W. B.

AU - Axelsson, M.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Becerra Gonzalez, J.

AU - Bellazzini, R.

AU - Berretta, A.

AU - Bissaldi, E.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonino, R.

AU - Bottacini, E.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buehler, R.

AU - Burnett, T. H.

AU - Buson, S.

AU - Cameron, R. A.

AU - Caputo, R.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Castro, D.

AU - Cavazzuti, E.

AU - Charles, E.

AU - Chaty, S.

AU - Chen, S.

AU - Cheung, C. C.

AU - Chiaro, G.

AU - Ciprini, S.

AU - Cohen-Tanugi, J.

AU - Cominsky, L. R.

AU - Coronado-Blázquez, J.

AU - Costantin, D.

AU - Cuoco, A.

AU - Cutini, S.

AU - D'Ammando, F.

AU - Deklotz, M.

AU - Torre Luque, P. De La

AU - De Palma, F.

AU - Desai, A.

AU - Digel, S. W.

AU - Lalla, N. Di

AU - Mauro, M. Di

AU - Venere, L. Di

AU - Domínguez, A.

AU - Dumora, D.

AU - Dirirsa, F. Fana

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Franckowiak, A.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Green, D.

AU - Grenier, I. A.

AU - Griffin, S.

AU - Grondin, M. H.

AU - Grove, J. E.

AU - Guiriec, S.

AU - Harding, A. K.

AU - Hayashi, K.

AU - Hays, E.

AU - Hewitt, J. W.

AU - Horan, D.

AU - Jóhannesson, G.

AU - Johnson, T. J.

AU - Kamae, T.

AU - Kerr, M.

AU - Kocevski, D.

AU - Kovac'evic', M.

AU - Kuss, M.

AU - Landriu, D.

AU - Larsson, S.

AU - Latronico, L.

AU - Lemoine-Goumard, M.

AU - Li, J.

AU - Liodakis, I.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Maldera, S.

AU - Malyshev, D.

AU - Manfreda, A.

AU - Marchesini, E. J.

AU - Marcotulli, L.

AU - Martí-Devesa, G.

AU - Martin, P.

AU - Massaro, F.

AU - Mazziotta, M. N.

AU - McEnery, J. E.

AU - Mereu, I.

AU - Meyer, M.

AU - Michelson, P. F.

AU - Mirabal, N.

AU - Mizuno, T.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Negro, M.

AU - Nuss, E.

AU - Ojha, R.

AU - Omodei, N.

AU - Orienti, M.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Palatiello, M.

AU - Paliya, V. S.

AU - Paneque, D.

AU - Pei, Z.

AU - Peña-Herazo, H.

AU - Perkins, J. S.

AU - Persic, M.

AU - Pesce-Rollins, M.

AU - Petrosian, V.

AU - Petrov, L.

AU - Piron, F.

AU - Poon, H.

AU - Porter, T. A.

AU - Principe, G.

AU - Rain, S.

AU - Rando, R.

AU - Razzano, M.

AU - Razzaque, S.

AU - Reimer, A.

AU - Reimer, O.

AU - Remy, Q.

AU - Reposeur, T.

AU - Romani, R. W.

AU - Parkinson, P. M.Saz

AU - Schinzel, F. K.

AU - Serini, D.

AU - Sgr, C.

AU - Siskind, E. J.

AU - Smith, D. A.

AU - Spandre, G.

AU - Spinelli, P.

AU - Strong, A. W.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, M. N.

AU - Tak, D.

AU - Thayer, J. B.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Torres, D. F.

AU - Torresi, E.

AU - Valverde, J.

AU - Klaveren, B. Van

AU - Zyl, P. Van

AU - Wood, K.

AU - Yassine, M.

AU - Zaharijas, G.

PY - 2020/3

Y1 - 2020/3

N2 - 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 4σ 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.

AB - 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 4σ 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.

UR - https://www.scopus.com/pages/publications/85091172627

U2 - 10.3847/1538-4365/ab6bcb

DO - 10.3847/1538-4365/ab6bcb

M3 - Article

AN - SCOPUS:85091172627

SN - 0067-0049

VL - 247

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

M1 - 33

ER -

Fermi Large Area Telescope Fourth Source Catalog

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