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Incremental Fermi Large Area Telescope Fourth Source Catalog

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arxiv 2201.11184 v3 pith:M7LUZRHM submitted 2022-01-26 astro-ph.HE

Fermi-LAT collaboration: Soheila Abdollahi , Fabio Acero , Luca Baldini , Jean Ballet , Denis Bastieri , Ronaldo Bellazzini , Bijan Berenji , Alessandra Berretta
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Elisabetta Bissaldi Roger D. Blandford Elliott Bloom Raffaella Bonino Ari Brill Richard J. Britto Philippe Bruel Toby H. Burnett Sara Buson Rob A. Cameron Regina Caputo Patrizia A. Caraveo Daniel Castro Sylvain Chaty Teddy C. Cheung Graziano Chiaro Nicolo Cibrario Stefano Ciprini Javier Coronado-Blazquez Milena Crnogorcevic Sara Cutini Filippo D'Ammando Salvatore De Gaetano Seth W. Digel Niccolo Di Lalla Feraol F. Dirirsa Leonardo Di Venere Alberto Dominguez Vandad Fallah Ramazani Stephen J. Fegan Elizabeth C. Ferrara Alessio Fiori Henrike Fleischhack Anna Franckowiak Yasushi Fukazawa Stefan Funk Piergiorgio Fusco Giorgio Galanti Viviana Gammaldi Fabio Gargano Simone Garrappa Dario Gasparrini Federica Giacchino Nico Giglietto Francesco Giordano Marcello Giroletti Thomas Glanzman David Green Isabelle A. Grenier Marie-Helene Grondin Lucas Guillemot Sylvain Guiriec Michael Gustafsson Alice K. Harding Liz Hays John W. Hewitt Deirdre Horan Xian Hou Gudlaugur Johannesson Christopher M. Karwin Taishu Kayanoki Matthew T. Kerr Michael Kuss David Landriu Stefan Larsson Luca Latronico Marianne Lemoine-Goumard Jian Li Ioannis Liodakis Francesco Longo Francesco Loparco Benoit Lott Pasquale Lubrano Simone Maldera Dmitry Malyshev Alberto Manfreda Guillem Marti-Devesa Mario N. Mazziotta Isabella Mereu Manuel Meyer Peter F. Michelson Nestor Mirabal Warit Mitthumsiri Tsunefumi Mizuno Alex A. Moiseev Maria E. Monzani Aldo Morselli Igor V. Moskalenko Michela Negro Eric Nuss Nicola Omodei Monica Orienti Elena Orlando David Paneque Zhiyuan Pei Jeremy S. Perkins Massimo Persic Melissa Pesce-Rollins Vahe Petrosian Roberta Pillera Helen Poon Troy A. Porter Giacomo Principe Silvia Raino Riccardo Rando Bindu Rani Massimiliano Razzano Soebur Razzaque Anita Reimer Olaf Reimer Thierry Reposeur Miguel A. Sanchez-Conde Pablo M. Saz Parkinson Lorenzo Scotton Davide Serini Carmelo Sgro Eric J. Siskind David A. Smith Gloria Spandre Paolo Spinelli Kohei Sueoka Dan J. Suson Hiro Tajima Dongguen Tak Jana B. Thayer David J. Thompson Diego F. Torres Eleonora Troja Janeth Valverde Kent Wood Gabrijela Zaharijas
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We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi-LAT catalog of gamma-ray sources. Based on the first twelve 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 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.

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