Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-03
Astrophys.J.699:1274-1280,2009
Astronomy and Astrophysics
Astrophysics
17 pages, 4 figures. Accepted by ApJ
Scientific paper
10.1088/0004-637X/699/2/1274
Recent observations of M87 and some blazars reveal violent activity in small regions located at relatively large distances from the central engine. Motivated by these considerations, we study the hydrodynamic collimation of a relativistic cooling outflow using a semi-analytical model developed earlier. We first demonstrate that radiative cooling of the shocked outflow layer can lead to a focusing of the outflow and its reconfinement in a region having a very small cross-sectional radius. Such a configuration can produce rapid variability at large distances from the central engine via reflections of the converging recollimation shock. Possible applications of this model to TeV blazars are discussed. We then apply our model to M87. The low radiative efficiency of the M87 jet renders focusing unlikely. However, the shallow profile of the ambient medium pressure inferred from observations, results in extremely good collimation that can explain the reported variability of the X-ray flux emitted from the HST-1 knot.
Bromberg Omer
Levinson A. A.
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