Particle acceleration in thick parallel shocks with high compression ratio

Details Particle acceleration in thick parallel shocks with high compression ratio Particle acceleration in thick parallel shocks with high compression ratio

2005-05-30

arxiv.org/abs/astro-ph/0505598v3

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted to A&A

Scientific paper

10.1051/0004-6361:20053349

We report studies on first-order Fermi acceleration in parallel modified shock waves with a large scattering center compression ratio expected from turbulence transmission models. Using a Monte Carlo technique we have modeled particle acceleration in shocks with a velocity ranging from nonrelativistic to ultrarelativistic and a thickness extending from nearly steplike to very wide structures exceeding the particle diffusion length by orders of magnitude. The nonrelativistic diffusion approximation is found to be surprisingly accurate in predicting the spectral index of a thick shock with large compression ratio even in the cases involving relativistic shock speeds.

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