Journal Article

γ-rays as a diagnostic of the origin of core radiation in low-luminosity active galactic nuclei

Hajime Takami

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 3, pages 1845-1851
Published in print May 2011 | ISSN: 0035-8711
Published online May 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18264.x
γ-rays as a diagnostic of the origin of core radiation in low-luminosity active galactic nuclei

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The respective contribution of disc and jet components to the total emission in low-luminosity active galactic nuclei (LLAGNs) is an open question. This paper suggests that γ-rays emitted from electrons accelerated in jets could be a direct diagnostic tool for a jet component to the total emission. We demonstrate γ-ray flux from jets based on a synchrotron self-Compton model on the assumption that radio and X-rays are dominantly produced from jets in the case of a high state of a nearby LLAGN, NGC 4278. We also survey parameter space in the model. Observational properties of LLAGNs in radio and X-ray bands allow to constrain physical parameters in an emission region. The size of the emission region R is limited to 1016R≤ 1017.5 cm if the observed tight correlation between radio and X-ray emission originates from the same jet component. If the beaming factor of the emission region is close to the observed parsec scale jet of NGC 4278 and R∼ 1016 cm, the γ-rays may be detected by the Cherenkov Telescope Array and the jet domination can be tested in the near future.

Keywords: galaxies: active; galaxies: individual: NGC 4278; galaxies: jets; galaxies: nuclei; gamma-rays: galaxies

Journal Article.  5296 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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