Collimation and Radiative Deceleration of Jets in TeV AGNs

Details Collimation and Radiative Deceleration of Jets in TeV AGNs Collimation and Radiative Deceleration of Jets in TeV AGNs

2007-12-17

arxiv.org/abs/0712.2664v1

Int.J.Mod.Phys.D17:1603-1610,2008

Astronomy and Astrophysics

Astrophysics

5 pages. Proceedings of "High Energy Phenomena in Relativistic Outflows", held in Dublin, Ireland, September 24-28, 2007

Scientific paper

10.1142/S0218271808013200

We consider some implications of the rapid X-ray and TeV variability observed in M87 and the TeV blazars. We outline a model for jet focusing and demonstrate that modest radiative cooling can lead to recollimation of a relativistic jet in a nozzle having a very small cross-sectional radius. Such a configuration can produce rapid variability at large distances from the central engine and may explain recent observations of the HST-1 knot in M87. Possible applications of this model to TeV blazars are discussed. We also discuss a scenario for the very rapid TeV flares observed with HESS and MAGIC in some blazars, that accommodates the relatively small Doppler factors inferred from radio observations.

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