Rapid variability of gamma-ray blazars: a model for MKN 421

Details Rapid variability of gamma-ray blazars: a model for MKN 421 Rapid variability of gamma-ray blazars: a model for MKN 421

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aph....11...59s&link_type=abstract

Astroparticle Physics, Volume 11, Issue 1-2, p. 59-61.

Physics

6

Scientific paper

The extremely rapid burst of TeV photons from MKN421 (1996 May 15), with a doubling time of 20 minutes at TeV energies, can be reconciled with the standard properties of a gamma-ray jet (bulk factor Gamma around 10 and size around 10^17 cm) if one relates the variability to anisotropies in the comoving frame of the jet, associated with the geometry of the shocks. The electrons are accelerated in conical shocks with both opening and viewing angle around 1/Gamma. If the injection time and the cooling time are much less than the crossing time of the photons, it is possible to observe very short flares in the light curve, in satisfactory agreement with the observations. The geometric condition on the viewing angle is not especially severe, and the probability to observe fast variability is around 20%.

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