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EP: Fachverband Extraterrestrische Physik
EP 4: Poster Session
EP 4.5: Poster
Tuesday, February 26, 2013, 11:15–12:45, Poster OG
Supernova remnants in a dense gas environment and the problem of the cosmic ray origin — •Tatyana Liseykina1, Mikhail Malkov2, and Galina Dudnikova3 — 1Institut für Physik, Universität Rostock, Germany — 2University of California at San Diego, USA — 3University of Maryland, USA
Although cosmic rays (CR) have been discovered a century ago, their origin is still not precisely known. The latest direct observations [1] of galactic supernova remnants (SNR) strongly support a hypothesis that those are the objects where most of the galactic CR originate from. Turning to the possible mechanisms of CR generation, observations favour the diffusive shock acceleration (DSA) scenario [2]. The limited understanding of the phenomena critical to the DSA, i.e., the confinement of energetic particles in partially ionized molecular clouds (MC) in front of SNR shocks, the modification of MC by cosmic rays, the escape of CRs and their propagation into the interstellar medium, precludes the interpretation of recent, significantly improved SNR observations. We review some important shortcomings of the theory, propose ways to overcome them, and present preliminary results on the identification of the most significant CR driven instabilities.
[1] A. A. Abdo et al., Science 327(2010); Astrophys. J. 734(2011); F. Aharonian et al., A& A 449(2006); R. Enomoto et al., Nature 416(2002); V.A. Acciari et al., Astrophys. J. 714(2010).
[2] L.O. Drury, Rep. Prog. Phys. 46 (1983); R. Blandford, D. Eichler, Phys. Rep. 154 (1987); M.A. Malkov, L.O. Drury, Rep. Prog. Phys. 64 (2001).