Thermal Particle Injection in Nonlinear Diffusive Shock Acceleration

Details Thermal Particle Injection in Nonlinear Diffusive Shock Acceleration Thermal Particle Injection in Nonlinear Diffusive Shock Acceleration

2005-07-05

arxiv.org/abs/astro-ph/0507107v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To be published in the proc. 29th ICRC (Puna, India) 2005

Scientific paper

Particle acceleration in collisionless astrophysical shocks, i.e., diffusive shock acceleration (DSA), is the most likely mechanism for producing cosmic rays, at least below 10^{15} eV. Despite the success of this theory, several key elements, including the injection of thermal particles, remains poorly understood. We investigate injection in strongly nonlinear shocks by comparing a semi-analytic model of DSA with a Monte Carlo model. These two models treat injection quite differently and we show, for a particular set of parameters, how these differences influence the overall acceleration efficiency and the shape of the broad-band distribution function.

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