Particle Acceleration in Relativistic Flows
摘要
A property common to several different astrophysical sources of high-energy gamma-rays is the presence of bulk motion at relativistic speed. The intrinsic spectra of the nonthermal radiating particles also show interesting similarities, with a pronounced hardening towards lower energies. This suggests two distinct acceleration mechanisms could be at work in these sources. At high energies, the stochastic first-order Fermi process at shocks seems to provide a reasonable explanation. I will briefly review the status of this mechanism before discussing the possibility that, at lower energies, non-stochastic acceleration in the induced electric field of a relativistic current sheet plays a role.
引用
@article{arxiv.astro-ph/0503316,
title = {Particle Acceleration in Relativistic Flows},
author = {J. G. Kirk},
journal= {arXiv preprint arXiv:astro-ph/0503316},
year = {2007}
}
备注
Invited talk at 22nd Texas Symposium, Stanford 13-17 Dec. 2004