Incremental Fermi Large Area Telescope Fourth Source Catalog
Abstract
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(but are kept in the list), while 74 are newly associated, 10 have an improved association, and seven associations were withdrawn.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.
Keywords
Cite
@article{arxiv.2201.11184,
title = {Incremental Fermi Large Area Telescope Fourth Source Catalog},
author = {LAT collaboration and Soheila Abdollahi and Fabio Acero and Luca Baldini and Jean Ballet and Denis Bastieri and Ronaldo Bellazzini and Bijan Berenji and Alessandra Berretta and Elisabetta Bissaldi and Roger D. Blandford and Elliott Bloom and Raffaella Bonino and Ari Brill and Richard J. Britto and Philippe Bruel and Toby H. Burnett and Sara Buson and Rob A. Cameron and Regina Caputo and Patrizia A. Caraveo and Daniel Castro and Sylvain Chaty and Teddy C. Cheung and Graziano Chiaro and Nicolo Cibrario and Stefano Ciprini and Javier Coronado-Blazquez and Milena Crnogorcevic and Sara Cutini and Filippo D'Ammando and Salvatore De Gaetano and Seth W. Digel and Niccolo Di Lalla and Feraol F. Dirirsa and Leonardo Di Venere and Alberto Dominguez and Vandad Fallah Ramazani and Stephen J. Fegan and Elizabeth C. Ferrara and Alessio Fiori and Henrike Fleischhack and Anna Franckowiak and Yasushi Fukazawa and Stefan Funk and Piergiorgio Fusco and Giorgio Galanti and Viviana Gammaldi and Fabio Gargano and Simone Garrappa and Dario Gasparrini and Federica Giacchino and Nico Giglietto and Francesco Giordano and Marcello Giroletti and Thomas Glanzman and David Green and Isabelle A. Grenier and Marie-Helene Grondin and Lucas Guillemot and Sylvain Guiriec and Michael Gustafsson and Alice K. Harding and Liz Hays and John W. Hewitt and Deirdre Horan and Xian Hou and Gudlaugur Johannesson and Christopher M. Karwin and Taishu Kayanoki and Matthew T. Kerr and Michael Kuss and David Landriu and Stefan Larsson and Luca Latronico and Marianne Lemoine-Goumard and Jian Li and Ioannis Liodakis and Francesco Longo and Francesco Loparco and Benoit Lott and Pasquale Lubrano and Simone Maldera and Dmitry Malyshev and Alberto Manfreda and Guillem Marti-Devesa and Mario N. Mazziotta and Isabella Mereu and Manuel Meyer and Peter F. Michelson and Nestor Mirabal and Warit Mitthumsiri and Tsunefumi Mizuno and Alex A. Moiseev and Maria E. Monzani and Aldo Morselli and Igor V. Moskalenko and Michela Negro and Eric Nuss and Nicola Omodei and Monica Orienti and Elena Orlando and David Paneque and Zhiyuan Pei and Jeremy S. Perkins and Massimo Persic and Melissa Pesce-Rollins and Vahe Petrosian and Roberta Pillera and Helen Poon and Troy A. Porter and Giacomo Principe and Silvia Raino and Riccardo Rando and Bindu Rani and Massimiliano Razzano and Soebur Razzaque and Anita Reimer and Olaf Reimer and Thierry Reposeur and Miguel A. Sanchez-Conde and Pablo M. Saz Parkinson and Lorenzo Scotton and Davide Serini and Carmelo Sgro and Eric J. Siskind and David A. Smith and Gloria Spandre and Paolo Spinelli and Kohei Sueoka and Dan J. Suson and Hiro Tajima and Dongguen Tak and Jana B. Thayer and David J. Thompson and Diego F. Torres and Eleonora Troja and Janeth Valverde and Kent Wood and Gabrijela Zaharijas},
journal= {arXiv preprint arXiv:2201.11184},
year = {2022}
}
Comments
accepted in ApJS; follow-up paper to 1902.10045