Other
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.3403o&link_type=abstract
American Astronomical Society, HEAD meeting #4, #34.03; Bulletin of the American Astronomical Society, Vol. 31, p.737
Other
Scientific paper
We consider possible dynamic effects on an (ultra-) relativistic jet and its ambient medium caused by high energy cosmic rays accelerated at the jet side boundary. As illustrated by a simple model, during the acceleration process a flat cosmic ray distribution can be created, with gyroradia for highest particles' energies reaching the scales comparable to the jet radius or the energy density comparable to the ambient medium pressure. In the case of efficient radiative losses a nearly mono-energetic high energy component can dominate the cosmic ray pressure. As a result the cosmic rays are expected to be able to push this medium off, providing a free of magnetized plasma cylindrical-like volume - a `cosmic ray cocoon' - separating the jet from the ambient medium. It is filled preferentially with photons and cosmic rays. The considered cosmic ray particles provide an additional jet breaking force and lead to a number of consequences for the jet structure and its radiative output. In particular the involved dynamic and acceleration time scales are comparable to the values from the range observed in variable AGNs. We note also a few possible consequences of the model for other observational properties, like a correlation of the self-absorption frequency with radiation intensity from the jet.
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