Measuring parameters of AGN central engines with very high energy gamma-ray flares

Details Measuring parameters of AGN central engines with very high energy gamma-ray flares Measuring parameters of AGN central engines with very high energy gamma-ray flares

2008-06-16

arxiv.org/abs/0806.2545v2

MNRAS 391 (2008) 949

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figure, accepted to MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13951.x

We discuss a "compact source" model of very high energy (VHE) 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 gamma-ray signal observed during a bright flare from this source, such as the minimal variability time scale and the recurrence period of the sub-flares, constrain the mass and the angular momentum of the supermassive black hole.

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