Journal Article

Alfvén wave amplification and self-containment of cosmic rays escaping from a supernova remnant

Yutaka Fujita, Fumio Takahara, Yutaka Ohira and Kazunari Iwasaki

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3434-3438
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18980.x
Alfvén wave amplification and self-containment of cosmic rays escaping from a supernova remnant

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We study the escape of cosmic ray (CR) protons accelerated in a supernova remnant (SNR) by numerically solving a diffusion–convection equation for regions from the vicinity of the shock front to those far away from the front. We consider the amplifications of Alfvén waves generated by the escaping CR particles and their effects on CR escape into the interstellar medium (ISM). We find that the amplification of the waves significantly delays the escape of the particles even in regions far away from the shock front (on the scale of an SNR). This means that the energy spectrum of CR particles determined through γ-ray observations of molecular clouds around SNRs is seriously affected by the particle scattering by the waves.

Keywords: ISM: clouds; cosmic rays; ISM: supernova remnants

Journal Article.  3269 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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