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TeV flaring activity of the AGN PKS 0625-354 in November 2018

Most γ-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 γ-ray flux and spectral variability a...

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Main Authors: Aharonian, Felix A. (Author) , Ait Benkhali, Faical (Author) , Bernlöhr, Konrad (Author) , Ghafourizadeh, Zahra (Author) , Hinton, James Anthony (Author) , Jankowsky, Felix (Author) , Marx, Ramin (Author) , Montanari, Alessandro (Author) , Quirrenbach, Andreas (Author) , Wagner, Stefan (Author) , Zacharias, Michael (Author)
Corporate Author: H.E.S.S. Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 06 March 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 683, Pages: 1-9
ISSN:1432-0746
DOI:10.1051/0004-6361/202348063
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202348063
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2024/03/aa48063-23/aa48063-23.html
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Author Notes:H.E.S.S. Collaboration: F. Aharonian, F. Ait Benkhali, K. Bernlöhr, S. Ghafourizadeh, J.A. Hinton, F. Jankowsky, R. Marx, A. Montanari, A. Quirrenbach, S.J. Wagner, M. Zacharias [und viele weitere]
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Summary:Most γ-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 γ-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 γγ-opacity constrains the upper limit of the angle between the jet and the line of sight to ∼10°. 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 γ-ray detected active galactic nuclei in general.
Item Description:Gesehen am 08.07.2024
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202348063

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