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Fermi Large Area Telescope Fourth Source Catalog
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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
2020. Vol. 247, no 1, article id 33
Keywords [en]
Catalogs, Gamma-ray astronomy, Sky surveys
National Category
Physical Sciences
Research subject
Education and Learning
Identifiers
URN: urn:nbn:se:du-32368DOI: 10.3847/1538-4365/ab6bcbISI: 000520200200001OAI: oai:DiVA.org:du-32368DiVA, id: diva2:1420972
Available from: 2020-04-01 Created: 2020-04-01 Last updated: 2020-04-01Bibliographically approved

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Larsson, Stefan

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  • nn-NB
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  • asciidoc
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