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Paper: Conversion of Blast Wave Energy into Radiation: Particle Transport Simulations
Volume: 299, High Energy Blazar Astronomy
Page: 143
Authors: Vainio, R.
Abstract: Particle transport in channeled ultra-relativistic blast waves is studied. Diffusive propagation of particles picked up by the self-generated turbulence inside the dense blast wave results in a non-symmetric escape of particles from the system: most particles propagate back to the blast-wave boundary and leak to the ambient medium ahead of the ejecta. The process is studied using numerical simulations to address the time scales of the process as well as the fate of the back-scattered particles ahead of the collimated ejecta. The back-scattering process is found to be very fast, developing a steady state in a few seconds in the blast-wave frame for typical parameters. Numerical modeling of the region ahead of the blast wave shows the formation of a shock front that recedes from the ejecta at a speed consistent with simple fluid theory as a result of an interaction between the cold interstellar medium and the backscattered relativistic particles. Different scenarios for the radiation emitted from such blast waves are discussed.
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