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TeV flaring activity of the AGN PKS 0625-354 in November 2018
Dublin Inst Adv Studies, Ireland;Max Planck Inst Kernphys, Germany;Yerevan State Univ, Armenia.
Heidelberg Univ, Germany.
Univ Groningen, Netherlands.
Ecole Polytech, France.
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2024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 683, article id A70Article in journal (Refereed) Published
Abstract [en]

Most gamma-ray detected active galactic nuclei are blazars with one of their relativistic jets pointing towards the Earth. Only a few objects belong to the class of radio galaxies or misaligned blazars. Here, we investigate the nature of the object PKS 0625-354, its gamma-ray flux and spectral variability and its broad-band spectral emission with observations from H.E.S.S., Fermi-LAT, Swift-XRT, and UVOT taken in November 2018. The H.E.S.S. light curve above 200 GeV shows an outburst in the first night of observations followed by a declining flux with a halving time scale of 5.9 h. The gamma gamma-opacity constrains the upper limit of the angle between the jet and the line of sight to similar to 10 degrees. The broad-band spectral energy distribution shows two humps and can be well fitted with a single-zone synchrotron self Compton emission model. We conclude that PKS 0625-354, as an object showing clear features of both blazars and radio galaxies, can be classified as an intermediate active galactic nuclei. Multi-wavelength studies of such intermediate objects exhibiting features of both blazars and radio galaxies are sparse but crucial for the understanding of the broad-band emission of gamma-ray detected active galactic nuclei in general.

Place, publisher, year, edition, pages
EDP Sciences, 2024. Vol. 683, article id A70
Keywords [en]
galaxies: active, galaxies: individual: PKS 0625-354, galaxies: jets, gamma rays: galaxies
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-128813DOI: 10.1051/0004-6361/202348063ISI: 001185071900015Scopus ID: 2-s2.0-85187160658OAI: oai:DiVA.org:lnu-128813DiVA, id: diva2:1851266
Available from: 2024-04-12 Created: 2024-04-12 Last updated: 2024-04-23Bibliographically approved

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Becherini, Yvonne

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