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Aharonian, F.; Ait Benkhali, F.; Aschersleben, J.; Ashkar, H.; Baktash, A.; Barnard, J.; Becherini, Y.; Bernlöhr, K.; Bi, B.; Böttcher, M.; Boisson, C.; Bolmont, J.; de Bony de Lavergne, M.; Bradascio, F.; Breuhaus, M.; Brose, R.; Brun, F.; Bruno, B.; Bulik, T.; Bylund, T.; Caroff, S.; Casanova, S.; Celic, J.; Cerruti, M.; Chand, T.; Chandra, S.; Chen, A.; Chibueze, J.; Chibueze, O.; Cotter, G.; Damascene Mbarubucyeye, J.; Davids, I. D.; Djuvsland, J.; Dmytriiev, A.; Doroshenko, V.; Egberts, K.; Ernenwein, J.-P.; Fontaine, G.; Funk, S.; Glawion, D.; Glombitza, J.; Goswami, P.; Hinton, J. A.; Holch, T. L.; Holler, M.; Jamrozy, M.; Jung-Richardt, I.; Katarzyński, K.; Khatoon, R.; Khélifi, B.; Kluźniak, W.; Komin, Nu; Kosack, K.; Kostunin, D.; Lang, R. G.; Leitl, F.; Lemière, A.; Lenain, J.-P.; Mackey, J.; Marx, R.; Mehta, A.; Meyer, M.; Mitchell, A.; Moulin, E.; Niemiec, J.; O’Brien, P.; Ohm, S.; Olivera-Nieto, L.; de Ona Wilhelmi, E.; Ostrowski, M.; Panny, S.; Parsons, R. D.; Pita, S.; Prokhorov, D. A.; Pühlhofer, G.; Reichherzer, P.; Reimer, A.; Reimer, O.; Rieger, F.; Sahakian, V.; Salzmann, H.; Sasaki, M.; Schüssler, F.; Schutte, H. M.; Specovius, A.; Spencer, S.; Steinmassl, S.; Streil, K.; Sushch, I.; Suzuki, H.; van Eldik, C.; Vecchi, M.; Veh, J.; Venter, C.; Wagner, S. J.; Wierzcholska, A.; Zacharias, M.; Zdziarski, A. A.; Zech, A.; Żywucka, N.
Astronomy and astrophysics (Berlin), 03/2024, Letnik: 683Journal Article
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.
