Rapid Variability of Gamma-ray Blazars: a Model for Markarian
نویسنده
چکیده
The extremely rapid burst of TeV photons from Mkn 421 (15 May 1996) can be reconciled with the standard properties of a relativistic γ-ray emitting jet (bulk Lorentz factor Γ ∼ 10; size ∼ 10 cm) if one assumes that the electrons are accelerated in conical shocks with both opening and viewing angles ≈ 1/Γ. If the injection time and the cooling time are much less than the photon crossing time, an emission ring moves along the jet and leads to the appearance of a very rapid flare, in satisfactory agreement with the observations. Subject headings: BL Lacertae objects : individual (Mkn 421) — galaxies : jets — gamma rays : observations — radiation mechanisms : non thermal
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