Stochastic Electron Acceleration in Shell-Type Supernova Remnants II

摘要

We discuss the generic characteristics of stochastic particle acceleration by a fully developed turbulence spectrumand show that resonant interactions of particles with high speed waves dominate the acceleration process. To produce therelativistic electrons inferred from the broadband spectrum of a few well-observed shell-type supernova remnants in theleptonic scenario for the TeV emission, fast mode waves must be excited effectively in the downstream and dominate theturbulence in the subsonic phase. Strong collisionless non-relativistic astrophysical shocks are studied with the assumptionof a constant Aflven speed. The energy density of non-thermal electrons is found to be comparable to that of the magneticfield. With reasonable parameters, the model explains observations of shell-type supernova remnants. More detailed studiesare warranted to better understand the nature of supernova shocks.