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Galaxies 2016, 4(4), 34; doi:10.3390/galaxies4040034

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

1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2
Instituto de Astrofísica de Andalucía, CSIC, Glorieta de la Astronomía, s/n, 18008 Granada, Spain
3
Institute for Astrophysical Research, Boston University, Boston, MA 02215, USA
4
Astronomical Institute, St. Petersburg State University, 198504 St. Petersburg, Russia
5
Istituto Nazionale di Astrofisica-IASFBO, 40127 Bologna, Italy
6
Aalto University Metsähovi Radio Observatory, FI-02540 Kylmälä, Finland
7
Department of Physics, Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, USA
8
Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
9
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
10
Aalto University Department of Radio Science and Engineering, FI-00076 Aalto, Finland
11
Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, 117810 Moscow, Russia
12
Crimean Astrophysical Observatory, 98409 Nauchny, Crimea, Russia
13
Pulkovo Observatory, 196140 St. Petersburg, Russia
14
Department of Physics and Institute for Plasma Physics, University of Crete, GR-71003 Heraklion, Greece
15
INAF, Osservatorio Astronomico di Roma, 00136 Roma, Italy
16
Department of Physical Sciences, Hiroshima University, Hiroshima Prefecture 739-8511, Japan
17
School of Maths and Physics, University of Tasmania, Australia, Private Bag 37, TAS 7001 Hobart, Australia
18
Instituto de Radio Astronomía Milimétrica, 18012 Granada, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Emilio Elizalde
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)
View Full-Text   |   Download PDF [3069 KB, uploaded 27 September 2016]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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