Incremental Fermi Large Area Telescope Fourth Source Catalog

Soheila Abdollahi (1) , Fabio Acero (2) , Luca Baldini , Jean Ballet (2) , Denis Bastieri , Ronaldo Bellazzini , Bijan Berenji , Alessandra Berretta , 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 (3, 4) , 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

1 IRAP - Institut de recherche en astrophysique et planétologie
2 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
4 USN - Unité Scientifique de la Station de Nançay

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.

Domaines: Astrophysique [astro-ph]

Soheila Abdollahi, Fabio Acero, Luca Baldini, Jean Ballet, Denis Bastieri, et al.. Incremental Fermi Large Area Telescope Fourth Source Catalog. Astrophys.J.Supp., 2022, 260 (2), pp.53. ⟨10.3847/1538-4365/ac6751⟩. ⟨hal-03589174⟩