Collimation and radiative deceleration of jets in TeV AGNs

A. Levinson*, O. Bromberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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 H.E.S.S. and MAGIC in some blazars, that accommodates the relatively small Doppler factors inferred from radio observations.

Original languageEnglish
Pages (from-to)1603-1610
Number of pages8
JournalInternational Journal of Modern Physics D
Issue number9
StatePublished - Sep 2008


  • Active galaxies
  • BL Lacertae objects
  • Gamma-rays
  • Jets
  • Nonthermal radiation mechanism


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