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The Connection between the Radio Jet and the γ-ray Emission in the Radio Galaxy 3C 120 and the Blazar CTA 102

Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Instituto de Astrofísica de Andalucía, CSIC, Glorieta de la Astronomía, s/n, 18008 Granada, Spain
Institute for Astrophysical Research, Boston University, Boston, MA 02215, USA
Astronomical Institute, St. Petersburg State University, 198504 St. Petersburg, Russia
Istituto Nazionale di Astrofisica-IASFBO, 40127 Bologna, Italy
Aalto University Metsähovi Radio Observatory, FI-02540 Kylmälä, Finland
Department of Physics, Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, USA
Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
Aalto University Department of Radio Science and Engineering, FI-00076 Aalto, Finland
Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, 117810 Moscow, Russia
Crimean Astrophysical Observatory, 98409 Nauchny, Crimea, Russia
Pulkovo Observatory, 196140 St. Petersburg, Russia
Department of Physics and Institute for Plasma Physics, University of Crete, GR-71003 Heraklion, Greece
INAF, Osservatorio Astronomico di Roma, 00136 Roma, Italy
Department of Physical Sciences, Hiroshima University, Hiroshima Prefecture 739-8511, Japan
School of Maths and Physics, University of Tasmania, Australia, Private Bag 37, TAS 7001 Hobart, Australia
Instituto de Radio Astronomía Milimétrica, 18012 Granada, Spain
Author to whom correspondence should be addressed.
Academic Editor: Emilio Elizalde
Galaxies 2016, 4(4), 34;
Received: 16 July 2016 / Revised: 14 September 2016 / Accepted: 15 September 2016 / Published: 27 September 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
We present multi-wavelength studies of the radio galaxy 3C 120 and the blazar CTA 102 during unprecedented γ-ray flares for both sources. In both studies the analysis of γ-ray data has been compared with a series of 43 GHz VLBA images from the VLBA-BU-BLAZAR program, providing the necessary spatial resolution to probe the parsec scale jet evolution during the high energy events. To extend the radio dataset for 3C 120 we also used 15 GHz VLBA data from the MOJAVE sample. These two objects which represent very different classes of AGN, have similar properties during the γ-ray events. The γ-ray flares are associated with the passage of a new superluminal component through the mm VLBI core, but not all ejections of new components lead to γ-ray events. In both sources γ-ray events occurred only when the new components are moving in a direction closer to our line of sight. We locate the γ-ray dissipation zone a short distance from the radio core but outside of the broad line region, suggesting synchrotron self-Compton scattering as the probable mechanism for the γ-ray production. View Full-Text
Keywords: galaxies: active; galaxies: radio continuum; galaxies: jets galaxies: active; galaxies: radio continuum; galaxies: jets
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Casadio, C.; Gómez, J.L.; Jorstad, S.G.; Marscher, A.P.; Grandi, P.; Larionov, V.M.; Lister, M.L.; Smith, P.S.; Gurwell, M.A.; Lähteenmäki, A.; Agudo, I.; Molina, S.N.; Bala, V.; Joshi, M.; Taylor, B.; Williamson, K.E.; Kovalev, Y.Y.; Savolainen, T.; Pushkarev, A.B.; Arkharov, A.A.; Blinov, D.A.; Borman, G.A.; Di Paola, A.; Grishina, T.S.; Hagen-Thorn, V.A.; Itoh, R.; Kopatskaya, E.N.; Larionova, E.G.; Larionova, L.V.; Morozova, D.A.; Rastorgueva-Foi, E.; Sergeev, S.G.; Tornikoski, M.; Troitsky, I.S.; Thum, C.; Wiesemeyer, H. The Connection between the Radio Jet and the γ-ray Emission in the Radio Galaxy 3C 120 and the Blazar CTA 102. Galaxies 2016, 4, 34.

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