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Fermi Large Area Telescope Fourth Source Catalog
Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Stockholm Univ, Dept Phys, AlbaNova, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0003-4378-8785
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.;Dalarna Univ, Sch Educ Hlth & Social Studies, Nat Sci, SE-79188 Falun, Sweden..ORCID iD: 0000-0003-0716-107x
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Number of Authors: 1692020 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 247, no 1, article id 33Article in journal (Refereed) Published
Abstract [en]

We present the fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, 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 the Galactic diffuse gamma-ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4 sigma significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2020. Vol. 247, no 1, article id 33
Keywords [en]
Catalogs, Gamma-ray astronomy, Sky surveys
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-271760DOI: 10.3847/1538-4365/ab6bcbISI: 000520200200001OAI: oai:DiVA.org:kth-271760DiVA, id: diva2:1422316
Note

QC 20200407

Available from: 2020-04-07 Created: 2020-04-07 Last updated: 2020-04-07Bibliographically approved

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Axelsson, MagnusJóhannesson, GudlaugurLarsson, Stefan

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