Particle acceleration close to the supermassive black hole horizon: the case of M87

Details Particle acceleration close to the supermassive black hole horizon: the case of M87 Particle acceleration close to the supermassive black hole horizon: the case of M87

2008-05-27

arxiv.org/abs/0805.4075v1

Int.J.Mod.Phys.D17:1569-1575,2008

Astronomy and Astrophysics

Astrophysics

5 pages, one figure (typos corrected); based on presentation at "High Energy Phenomena in Relativistic Outflows", Dublin, Sept

Scientific paper

10.1142/S0218271808013169

The radio galaxy M87 has recently been found to be a rapidly variable TeV emitting source. We analyze the implications of the observed TeV characteristics and show that it proves challenging to account for them within conventional acceleration and emission models. We discuss a new pulsar-type scenario for the origin of variable, very high energy (VHE) emission close to the central supermassive black hole and show that magneto-centrifugally accelerated electrons could efficiently Compton upscatter sub-mm ADAF disk photons to the TeV regime, leading to VHE characteristics close to the observed ones. This suggests, conversely, that VHE observations of highly under-luminous AGNs could provide an important diagnostic tool for probing the conditions prevalent in the inner accretion disk of these sources.

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