Berlin 2014 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 1: Astrophysik
EP 1.2: Talk
Monday, March 17, 2014, 14:30–14:45, DO24 1.103
Evidence for the Stochastic Acceleration in Supernova Remnants — •Alina Wilhelm1,2 and Igor Telezhinsky1 — 1Desy, Zeuthen, Deutschland — 2Universität Potsdam, Deutschland
Observationally deduced particle spectra in Supernova Remnants (SNR) often do not fit to expectations based on cosmic-ray modified Diffusive Shock Acceleration theory. Here we are concerned with the Second Order Fermi Acceleration process; we discuss its benefits and argue why introducing such a mechanism is the most natural solution. We solve the full transport equation for cosmic rays in the test-particle regime and investigate the consequences of Stochastic Acceleration. We infer that Second Order Fermi Acceleration strongly modifies the particle spectrum and that its contribution is sufficient to generate the observed radio emission flux. We therefore conclude that Stochastic Acceleration is an essential part of the particle dynamics in SNR.