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

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arxiv 2401.07071 v1 pith:YONSWY5G submitted 2024-01-13 astro-ph.HE

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
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J. Barnard R. Batzofin Y. Becherini D. Berge K. Bernl\"ohr B. Bi M. B\"ottcher 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 K. Egberts S. Einecke J.-P. Ernenwein G. Fontaine M. F\"u{\ss}ling S. Funk S. Gabici S. Ghafourizadeh G. Giavitto D. Glawion J.F. Glicenstein J. Glombitza P. Goswami G. Grolleron L. Haerer J.A. Hinton T.L. Holch M. Holler D. Horns M. Jamrozy F. Jankowsky V. Joshi I. Jung-Richardt E. Kasai K. Katarzy\'nski R. Khatoon B. Kh'elifi z niak Nu. Komin K. Kosack D. Kostunin R.G. Lang S. Le Stum F. Leitl A. Lemi\`ere J.-P. Lenain F. Leuschner A. Luashvili J. Mackey R. Marx A. Mehta M. Meyer A. Mitchell R. Moderski A. Montanari E. Moulin M. de Naurois J. Niemiec P. O'Brien S. Ohm L. Olivera-Nieto E. de Ona Wilhelmi M. Ostrowski S. Panny R.D. Parsons S. Pita D.A. Prokhorov G. P\"uhlhofer M. Punch A. Quirrenbach P. Reichherzer A. Reimer O. Reimer H. Ren F. Rieger B. Rudak V. Sahakian H. Salzmann D.A. Sanchez M. Sasaki F. Sch\"ussler H.M. Schutte J.N.S. Shapopi H. Sol A. Specovius S. Spencer L. Stawarz R. Steenkamp S. Steinmassl K. Streil I. Sushch H. Suzuki T. Takahashi T. Tanaka C. van Eldik M. Vecchi J. Veh C. Venter S.J. Wagner A. Wierzcholska M. Zacharias D. Zargaryan A.A. Zdziarski A. Zech S. Zouari N. \.Zywucka
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keywords gammablazarsactivebroad-bandemissiongalacticgalaxiesnuclei
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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 5.9h. The $\gamma\gamma$-opacity constrains the upper limit of the angle between the jet and the line of sight to $\sim10^\circ$. 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.

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