Structured jets in TeV BL Lac objects and radiogalaxies

Details Structured jets in TeV BL Lac objects and radiogalaxies Structured jets in TeV BL Lac objects and radiogalaxies

2004-06-03

arxiv.org/abs/astro-ph/0406093v2

Astron.Astrophys.432:401-410,2005

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures, revised version accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20041404

TeV BL Lacertae objects require extreme relativistic bulk motion in the gamma-ray emission region, but at the VLBI scale their radio knots hardly move. The same sources show evidence, in radio, of a structure made of a fast spine plus a slow layer. We propose that this structure exists even on the spatial scale of regions responsible for the gamma-ray emission. One component sees the (beamed) radiation produced by the other, and this enhances the inverse Compton emission of both components. In addition, this allows the magnetic field to be nearly in equipartition with the emitting particles. The inverse Compton emission of the spine is anisotropic in its frame, possibly producing the deceleration of the spine by the Compton rocket effect. In this scenario, also the slow layer is a relatively strong high energy emitter, and thus radiogalaxies become potentially detectable by GLAST.

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