Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-29
AIP Conf.Proc.801:369-372,2006
Astronomy and Astrophysics
Astrophysics
4 pages, to appear in the proceedings of "Astrophysical Sources of High Energy Particles and Radiation", Torun, 20-24 June 200
Scientific paper
10.1063/1.2141902
The dynamical reaction of the particles accelerated at a shock front by the first order Fermi process can be determined within kinetic models that account for both the hydrodynamics of the shocked fluid and the transport of the accelerated particles. These models predict the appearance of multiple solutions, all physically allowed. We discuss here the role of injection in selecting the {\it real} solution, in the framework of a simple phenomenological recipe, which is a variation of what is sometimes referred to as {\it thermal leakage}. In this context we show that multiple solutions basically disappear and when they are present they are limited to rather peculiar values of the parameters.
Blasi Pasquale
Gabici Stefano
Vannoni Giulia
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