Journal
ASTRONOMY & ASTROPHYSICS
Volume 394, Issue 3, Pages 1141-1144Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20021173
Keywords
acceleration of particles; shock waves; X-rays : bursts; gamma-rays : bursts; ISM : cosmic rays
Categories
Ask authors/readers for more resources
The first-order Fermi acceleration process at an ultra-relativistic shock wave is expected to create a particle spectrum with the unique asymptotic spectral index sigma(gamma >>1) approximate to 2.2. Below, we discuss this result and differences in its various derivations, which - explicitly or implicitly - always require highly turbulent conditions downstream of the shock. In the presence of medium amplitude turbulence the generated particle spectrum can be much steeper than the above asymptotic one. We also note problems with application of the pitch angle diffusion model for particle transport near the ultra-relativistic shocks.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available