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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-4378-8785
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
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2020 (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
IOP PUBLISHING LTD , 2020. Vol. 892, no 2, article id 105
Keywords [en]
Active galactic nuclei, Blazars, Gamma-ray sources, Relativistic jets, Quasars, BL Lacertae objects
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-272670DOI: 10.3847/1538-4357/ab791eISI: 000523454000001OAI: oai:DiVA.org:kth-272670DiVA, id: diva2:1429792
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QC 20200512

Available from: 2020-05-12 Created: 2020-05-12 Last updated: 2020-05-12Bibliographically approved

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Axelsson, MagnusJóhannesson, GudlaugurLarsson, Stefan

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