The connection between the radio jet and the γ-ray emission in the radio galaxy 3C 120 and the blazar CTA 102

Carolina Casadio, José L. Gómez, Svetlana G. Jorstad, Alan P. Marscher, Paola Grandi, Valeri M. Larionov, Matthew L. Lister, Paul S. Smith, Mark A. Gurwell, Anne Lähteenmäki, Iván Agudo, Sol N. Molina, Vishal Bala, Manasvita Joshi, Brian Taylor, Karen E. Williamson, Yuri Y. Kovalev, Tuomas Savolainen, Alexander B. Pushkarev, Arkady A. ArkharovDmitry A. Blinov, George A. Borman, Andrea Di Paola, Tatiana S. Grishina, Vladimir A. Hagen-Thorn, Ryosuke Itoh, Evgenia N. Kopatskaya, Elena G. Larionova, Liudmila V. Larionova, Daria A. Morozova, Elizaveta Rastorgueva-Foi, Sergey G. Sergeev, Merja Tornikoski, Ivan S. Troitsky, Clemens Thum, Helmut Wiesemeyer

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Article number34
JournalGalaxies
Volume4
Issue number4
DOIs
StatePublished - Dec 1 2016
Externally publishedYes

Keywords

  • Galaxies: active
  • Galaxies: jets
  • Galaxies: radio continuum

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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