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

H.E.S.S. Collaboration; F. Aharonian; F. Ait Benkhali; J. Aschersleben; H. Ashkar; M. Backes; A. Baktash; V. Barbosa Martins; J. Barnard; R. Batzofin; Y. Becherini; D. Berge; K. Bernlöhr; B. Bi; M. Böttcher; C. Boisson; J. Bolmont; M. de Bony de Lavergne; J. Borowska; F. Bradascio; M. Breuhaus; R. Brose; A. Brown; F. Brun; B. Bruno; T. Bulik; C. Burger-Scheidlin; T. Bylund; S. Caroff; S. Casanova; R. Cecil; J. Celic; M. Cerruti; T. Chand; S. Chandra; A. Chen; J. Chibueze; O. Chibueze; G. Cotter; J. Damascene Mbarubucyeye; I. D. Davids; J. Djuvsland; A. Dmytriiev; V. Doroshenko; A. Mehta; M. Meyer; H. Ren; H. M. Schutte; H. Sol; T. Tanaka; M. Vecchi

doi:10.1051/0004-6361/202348063

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

H.E.S.S. Collaboration, F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar, M. Backes, A. Baktash, V. Barbosa Martins, J. Barnard, R. Batzofin, Y. Becherini, D. Berge, K. Bernlöhr, B. Bi, M. Böttcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, F. BradascioM. Breuhaus, R. Brose, A. Brown, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, T. Bylund, S. Caroff, S. Casanova, R. Cecil, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, J. Damascene Mbarubucyeye, I. D. Davids, J. Djuvsland, A. Dmytriiev, V. Doroshenko, A. Mehta, M. Meyer, H. Ren, H. M. Schutte, H. Sol, T. Tanaka, M. Vecchi

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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
Article number	A70
Number of pages	9
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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TeV flaring activity of the AGN PKS 0625–354 in November 2018Final publisher's version, 458 KBLicence: CC BY

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H.E.S.S. Collaboration, Aharonian, F., Ait Benkhali, F., Aschersleben, J., Ashkar, H., Backes, M., Baktash, A., Barbosa Martins, V., Barnard, J., Batzofin, R., Becherini, Y., Berge, D., Bernlöhr, K., Bi, B., Böttcher, M., Boisson, C., Bolmont, J., de Bony de Lavergne, M., Borowska, J., ... Vecchi, M. (2024). TeV flaring activity of the AGN PKS 0625–354 in November 2018. Astronomy and Astrophysics, 683, Article A70. https://doi.org/10.1051/0004-6361/202348063

@article{82c4348e0f6f4a6f9abb476df45d5cf4,

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 A. Mehta and M. Meyer and H. Ren and Schutte, {H. M.} and H. Sol and T. Tanaka and M. Vecchi",

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",

publisher = " EDP Sciences",

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H.E.S.S. Collaboration, Aharonian, F, Ait Benkhali, F, Aschersleben, J, Ashkar, H, Backes, M, Baktash, A, Barbosa Martins, V, Barnard, J, Batzofin, R, Becherini, Y, Berge, D, Bernlöhr, K, Bi, B, Böttcher, M, Boisson, C, Bolmont, J, de Bony de Lavergne, M, Borowska, J, Bradascio, F, Breuhaus, M, Brose, R, Brown, A, Brun, F, Bruno, B, Bulik, T, Burger-Scheidlin, C, Bylund, T, Caroff, S, Casanova, S, Cecil, R, Celic, J, Cerruti, M, Chand, T, Chandra, S, Chen, A, Chibueze, J, Chibueze, O, Cotter, G, Mbarubucyeye, JD, Davids, ID, Djuvsland, J, Dmytriiev, A, Doroshenko, V, Mehta, A, Meyer, M, Ren, H, Schutte, HM, Sol, H, Tanaka, T & Vecchi, M 2024, 'TeV flaring activity of the AGN PKS 0625–354 in November 2018', Astronomy and Astrophysics, vol. 683, A70. https://doi.org/10.1051/0004-6361/202348063

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 - Mehta, A.

AU - Meyer, M.

AU - Ren, H.

AU - Schutte, H. M.

AU - Sol, H.

AU - Tanaka, T.

AU - Vecchi, M.

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

UR - http://www.scopus.com/inward/record.url?scp=85187160658&partnerID=8YFLogxK

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

M1 - A70

ER -

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

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Keywords

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