Particle Acceleration in Relativistic Flows

Details Particle Acceleration in Relativistic Flows Particle Acceleration in Relativistic Flows

2005-03-15

arxiv.org/abs/astro-ph/0503316v1

Astronomy and Astrophysics

Astrophysics

Invited talk at 22nd Texas Symposium, Stanford 13-17 Dec. 2004

Scientific paper

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.

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