Fermi Large Area Telescope Fourth Source Catalog
Abstract
We distribute a preliminary version of the fourth Fermi Large Area Telescope source catalog (4FGL) meant to help in writing 2019 NASA Fermi Guest Investigator proposals. This supersedes the FL8Y source list distributed in 2018. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission and the 50 MeV - 1 TeV range, 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 Galactic diffuse gamma-ray emission. The 4FGL catalog includes 5098 sources above 4 sigma significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall 364 sources are considered as identified based on angular extent or correlated variability observed at other wavelengths. For 1525 sources we have not found plausible counterparts at other wavelengths. More than 2940 of the identified or associated sources are active galaxies of the blazar class, 241 are pulsars.Keywords
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