학술논문
TeV flaring activity of the AGN PKS 0625-354 in November 2018
Document Type
Author
Aharonian, F.; Benkhali, F. Ait; Aschersleben, J.; Ashkar, H.; Backes, M.; Baktash, A.; Martins, V. Barbosa; Barnard, J.; Batzofin, R.; Becherini, Yvonne; Berge, D.; Bernloehr, K.; Bi, B.; Bottcher, M.; Boisson, C.; Bolmont, J.; de Lavergne, M. de Bony; 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, J. Damascene; Davids, I. D.; Djuvsland, J.; Dmytriiev, A.; Doroshenko, V.; Egberts, K.; Einecke, S.; Ernenwein, J. -P; Fontaine, G.; Fuessling, M.; Funk, S.; Gabici, S.; Ghafourizadeh, S.; Giavitto, G.; Glawion, D.; Glicenstein, J. F.; Glombitza, J.; Goswami, P.; Grolleron, G.; Haerer, L.; Hinton, J. A.; Holch, T. L.; Holler, M.; Horns, D.; Jamrozy, M.; Jankowsky, F.; Joshi, V.; Jung-Richardt, I.; Kasai, E.; Katarzynski, K.; Khatoon, R.; Khelifi, B.; Kluniak, W.; Komin, Nu.; Kosack, K.; Kostunin, D.; Lang, R. G.; Le Stum, S.; Leitl, F.; Lemiere, A.; Lenain, J. -P; Leuschner, F.; Luashvili, A.; Mackey, J.; Marx, R.; Mehta, A.; Meyer, M.; Mitchell, A.; Moderski, R.; Montanari, A.; Moulin, E.; de Naurois, M.; Niemiec, J.; O'Brien, P.; Ohm, S.; Olivera-Nieto, L.; Wilhelmi, E. de Ona; Ostrowski, M.; Panny, S.; Parsons, R. D.; Pita, S.; Prokhorov, D. A.; Puehlhofer, G.; Punch, M.; Quirrenbach, A.; Reichherzer, P.; Reimer, A.; Reimer, O.; Ren, H.; Rieger, F.; Rudak, B.; Sahakian, V.; Salzmann, H.; Sanchez, D. A.; Sasaki, M.; Schuessler, F.; Schutte, H. M.; Shapopi, J. N. S.; Sol, H.; Specovius, A.; Spencer, S.; Stawarz, L.; Steenkamp, R.; Steinmassl, S.; Streil, K.; Sushch, I.; Suzuki, H.; Takahashi, T.; Tanaka, T.; van Eldik, C.; Vecchi, M.; Veh, J.; Venter, C.; Wagner, S. J.; Wierzcholska, A.; Zacharias, M.; Zargaryan, D.; Zdziarski, A. A.; Zech, A.; Zouari, S.; Zywucka, N.
Source
Astronomy and Astrophysics. 683
Subject
Language
English
ISSN
0004-6361
1432-0746
1432-0746
Abstract
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 5.9 h. The gamma gamma-opacity constrains the upper limit of the angle between the jet and the line of sight to similar to 10 degrees. 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.