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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
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Number of Authors: 1282020 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 892, no 2, article id 105Article in journal (Refereed) Published
Abstract [en]

The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains . It includes 85% more sources than the previous 3LAC catalog based on 4 yr of data. AGNs represent at least 79% of the high-latitude sources in the fourth Fermi-Large Area Telescope Source Catalog (4FGL), which covers the energy range from 50 MeV to 1 TeV. In addition, gamma-ray AGNs are found at low Galactic latitudes. Most of the 4LAC AGNs are blazars (98%), while the remainder are other types of AGNs. The blazar population consists of 24% Flat Spectrum Radio Quasars (FSRQs), 38% BL Lac-type objects, and 38% blazar candidates of unknown types (BCUs). On average, FSRQs display softer spectra and stronger variability in the gamma-ray band than BL Lacs do, confirming previous findings. All AGNs detected by ground-based atmospheric Cerenkov telescopes are also found in the 4LAC.

Place, publisher, year, edition, pages
2020. Vol. 892, no 2, article id 105
National Category
Physical Sciences
Research subject
Research Profiles 2009-2020, Education and Learning
Identifiers
URN: urn:nbn:se:du-32615DOI: 10.3847/1538-4357/ab791eISI: 000523454000001Scopus ID: 2-s2.0-85084846892OAI: oai:DiVA.org:du-32615DiVA, id: diva2:1428336
Available from: 2020-05-05 Created: 2020-05-05 Last updated: 2021-11-12Bibliographically approved

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Larsson, Stefan

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  • apa
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  • fi-FI
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  • nn-NB
  • sv-SE
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  • html
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  • asciidoc
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