Journal Article

Measuring parameters of active galactic nuclei central engines with very high energy γ-ray flares

A. Neronov, D. Semikoz and S. Sibiryakov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 2, pages 949-958
Published in print December 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13951.x
Measuring parameters of active galactic nuclei central engines with very high energy γ-ray flares

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We discuss a ‘compact source’ model of very high energy emission from blazars in which the variability time is determined by the blazar central engine. In this model, electron or proton acceleration close to the supermassive black hole is followed by the development of electromagnetic cascade in a radiatively inefficient accretion flow. Assuming such a model for the TeV blazar PKS 2155−304, we show that the variability properties of the TeV γ-ray signal observed during a bright flare from this source, such as the minimal variability time-scale and the recurrence period of the subflares, constrain the mass and the angular momentum of the supermassive black hole.

Keywords: black hole physics; radiation mechanisms: non-thermal; BL Lacertae objects: individual: PKS 2155−304; galaxies: nuclei; gamma-rays: theory

Journal Article.  8483 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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