Incremental Fermi Large Area Telescope Fourth Source Catalog
Creators: name: Abdollahi, Soheila
name: Acero, Fabio
name: Baldini, Luca
name: Ballet, Jean
name: Bastieri, Denis
name: Bellazzini, Ronaldo
name: Berenji, Bijan
name: Berretta, Alessandra
name: Bissaldi, Elisabetta
name: Blandford, Roger D.
name: Bloom, Elliott
name: Bonino, Raffaella
name: Brill, Ari
name: Britto, Richard J.
name: Bruel, Philippe
name: Burnett, Toby H.
name: Buson, Sara
name: Cameron, Rob A.
name: Caputo, Regina
name: Caraveo, Patrizia A.
name: Castro, Daniel
name: Chaty, Sylvain
name: Cheung, Teddy C.
name: Chiaro, Graziano
name: Cibrario, Nicolo
name: Ciprini, Stefano
name: Coronado-Blazquez, Javier
name: Crnogorcevic, Milena
name: Cutini, Sara
name: D'Ammando, Filippo
name: De Gaetano, Salvatore
name: Digel, Seth W.
name: Di Lalla, Niccolo
name: Dirirsa, Feraol F.
name: Di Venere, Leonardo
name: Dominguez, Alberto
name: Fallah Ramazani, Vandad
name: Fegan, Stephen J.
name: Ferrara, Elizabeth C.
name: Fiori, Alessio
name: Fleischhack, Henrike
name: Franckowiak, Anna
name: Fukazawa, Yasushi
name: Funk, Stefan
name: Fusco, Piergiorgio
name: Galanti, Giorgio
name: Gammaldi, Viviana
name: Gargano, Fabio
name: Garrappa, Simone
name: Gasparrini, Dario
name: Giacchino, Federica
name: Giglietto, Nico
name: Giordano, Francesco
name: Giroletti, Marcello
name: Glanzman, Thomas
name: Green, David
name: Grenier, Isabelle A.
name: Grondin, Marie-Helene
name: Guillemot, Lucas
name: Guiriec, Sylvain
name: Gustafsson, Michael
name: Harding, Alice K.
name: Hays, Liz
name: Hewitt, John W.
name: Hays, E.
name: Horan, Deirdre
name: Hou, Xian
name: Johannesson, Gudlaugur
name: Karwin, Christopher M.
name: Kayanoki, Taishu
name: Kerr, Matthew T.
name: Kuss, Michael
name: Landriu, David
name: Larsson, Stefan
name: Latronico, Luca
name: Lemoine-Goumard, Marianne
name: Li, Jian
name: Liodakis, Ioannis
name: Longo, Francesco
name: Loparco, Francesco
name: Lott, Benoit
name: Lubrano, Pasquale
name: Maldera, Simone
name: Malyshev, Dmitry
name: Manfreda, Alberto
name: Marti-Devesa, Guillem
name: Mazziotta, Mario N.
name: Mereu, Isabella
name: Meyer, Manuel
name: Michelson, Peter F.
name: Mirabal, Nestor
name: Mitthumsiri, Warit
name: Mizuno, Tsunefumi
name: Moiseev, Alex A.
name: Monzani, Maria E.
name: Morselli, Aldo
name: Moskalenko, Igor V.
name: Negro, Michela
name: Nuss, Eric
name: Omodei, Nicola
name: Orienti, Monica
name: Orlando, Elena
name: Paneque, David
name: Pei, Zhiyuan
name: Perkins, Jeremy S.
name: Persic, Massimo
name: Pesce-Rollins, Melissa
name: Petrosian, Vahe
name: Pillera, Roberta
name: Poon, Helen
name: Porter, Troy A.
name: Principe, Giacomo
name: Raino, Silvia
name: Rando, Riccardo
name: Rani, Bindu
name: Razzano, Massimiliano
name: Razzaque, Soebur
name: Reimer, Anita
name: Reimer, Olaf
name: Reposeur, Thierry
name: Sanchez-Conde, Miguel A.
name: Saz Parkinson, Pablo M.
name: Scotton, Lorenzo
name: Serini, Davide
name: Sgro, Carmelo
name: Siskind, Eric J.
name: Smith, David A.
name: Spandre, Gloria
name: Spinelli, Paolo
name: Sueoka, Kohei
name: Suson, Dan J.
name: Tajima, Hiro
name: Tak, Dongguen
name: Thayer, Jana B.
name: Thompson, David J.
name: Torres, Diego F.
name: Troja, Eleonora
name: Valverde, Janeth
name: Wood, Kent
name: Zaharijas, Gabrijela
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2022
Subjects: subject: 520

description: We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi Large Area Telescope (LAT) catalog of γ-ray sources. Based on the first 12 years of science data in the energy range from 50 MeV to 1 TeV, it contains 6658 sources. The analysis improves on that used for the 4FGL catalog over eight years of data: more sources are fit with curved spectra, we introduce a more robust spectral parameterization for pulsars, and we extend the spectral points to 1 TeV. The spectral parameters, spectral energy distributions, and associations are updated for all sources. Light curves are rebuilt for all sources with 1 yr intervals (not 2 month intervals). Among the 5064 original 4FGL sources, 16 were deleted, 112 are formally below the detection threshold over 12 yr (but are kept in the list), while 74 are newly associated, 10 have an improved association, and seven associations were withdrawn. Pulsars are split explicitly between young and millisecond pulsars. Pulsars and binaries newly detected in LAT sources, as well as more than 100 newly classified blazars, are reported. We add three extended sources and 1607 new point sources, mostly just above the detection threshold, among which eight are considered identified, and 699 have a plausible counterpart at other wavelengths. We discuss the degree-scale residuals to the global sky model and clusters of soft unassociated point sources close to the Galactic plane, which are possibly related to limitations of the interstellar emission model and missing extended sources.