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

H.E.S.S. Collaboration

doi:10.1051/0004-6361/202348063

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

H.E.S.S. Collaboration

Dublin Institute for Advanced Studies
Max-Planck-Institut für Kernphysik
Yerevan State University
Landessternwarte Heidelberg
University of Groningen
University of Namibia
North-West University
Universität Hamburg
c/o DESY
University of the Free State
University of Potsdam
Astroparticule and Cosmol APC
Linnaeus University, Växjö
Humboldt-Universität zu Berlin
University of Tübingen
LUTH - Laboratoire de l'Univers et de ses Theories
Sorbonne Université
Université Paris-Saclay
University of Oxford
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
University of Warsaw
Université Savoie Mont Blanc
Institute for Nuclear Physics
University of the Witwatersrand, Johannesburg
University of Adelaide
Aix-Marseille Université
Ip Paris
University of Innsbruck
Jagiellonian University
Nicolaus Copernicus University
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
University of Leicester
University of Amsterdam
Yerevan Physics Institute
Konan University
University of Tokyo

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Journal	Astronomy and Astrophysics
Volume	683
DOIs	https://doi.org/10.1051/0004-6361/202348063
Publication status	Published - 1 Mar 2024

Keywords

galaxies: active
galaxies: individual: PKS 0625–354
galaxies: jets
gamma rays: galaxies

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10.1051/0004-6361/202348063

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@article{8732b49ce12d46ef83a93f1f6013de34,

title = "TeV flaring activity of the AGN PKS 0625–354 in November 2018",

abstract = "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.",

keywords = "galaxies: active, galaxies: individual: PKS 0625–354, galaxies: jets, gamma rays: galaxies",

author = "\{H.E.S.S. Collaboration\} and F. Aharonian and \{Ait Benkhali\}, F. and J. Aschersleben and H. Ashkar and M. Backes and A. Baktash and \{Barbosa Martins\}, V. and J. Barnard and R. Batzofin and Y. Becherini and D. Berge and K. Bernl{\"o}hr and B. Bi and M. B{\"o}ttcher and C. Boisson and J. Bolmont and \{de Bony de Lavergne\}, M. and J. Borowska and F. Bradascio and M. Breuhaus and R. Brose and A. Brown and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and S. Caroff and S. Casanova and R. Cecil and J. Celic and M. Cerruti and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and G. Cotter and Mbarubucyeye, \{J. Damascene\} and Davids, \{I. D.\} and J. Djuvsland and A. Dmytriiev and V. Doroshenko and K. Egberts and S. Einecke and Ernenwein, \{J. P.\} and G. Fontaine and M. F{\"u}{\ss}ling and S. Funk and S. Gabici",

note = "Publisher Copyright: {\textcopyright} The Authors 2024.",

year = "2024",

month = mar,

day = "1",

doi = "10.1051/0004-6361/202348063",

language = "English",

volume = "683",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

}

TY - JOUR

T1 - TeV flaring activity of the AGN PKS 0625–354 in November 2018

AU - H.E.S.S. Collaboration

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Aschersleben, J.

AU - Ashkar, H.

AU - Backes, M.

AU - Baktash, A.

AU - Barbosa Martins, V.

AU - Barnard, J.

AU - Batzofin, R.

AU - Becherini, Y.

AU - Berge, D.

AU - Bernlöhr, K.

AU - Bi, B.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - de Bony de Lavergne, M.

AU - Borowska, J.

AU - Bradascio, F.

AU - Breuhaus, M.

AU - Brose, R.

AU - Brown, A.

AU - Brun, F.

AU - Bruno, B.

AU - Bulik, T.

AU - Burger-Scheidlin, C.

AU - Bylund, T.

AU - Caroff, S.

AU - Casanova, S.

AU - Cecil, R.

AU - Celic, J.

AU - Cerruti, M.

AU - Chand, T.

AU - Chandra, S.

AU - Chen, A.

AU - Chibueze, J.

AU - Chibueze, O.

AU - Cotter, G.

AU - Mbarubucyeye, J. Damascene

AU - Davids, I. D.

AU - Djuvsland, J.

AU - Dmytriiev, A.

AU - Doroshenko, V.

AU - Egberts, K.

AU - Einecke, S.

AU - Ernenwein, J. P.

AU - Fontaine, G.

AU - Füßling, M.

AU - Funk, S.

AU - Gabici, S.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - 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.

AB - 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.

KW - galaxies: active

KW - galaxies: individual: PKS 0625–354

KW - galaxies: jets

KW - gamma rays: galaxies

U2 - 10.1051/0004-6361/202348063

DO - 10.1051/0004-6361/202348063

M3 - Article

AN - SCOPUS:85187160658

SN - 0004-6361

VL - 683

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

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

Abstract

Keywords

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