Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant

Details Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1269..126f&link_type=abstract

THE 10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: OMEG-2010. AIP Conference Proceedings, Volume 1

Physics

Supernova Remnants, Cosmic Rays, Interstellar Matter, Interstellar Molecular Clouds, Gamma-Ray Production, Supernovae, Cosmic Rays, Physical Properties, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We study the escape of cosmic-ray protons accelerated at a supernova remnant (SNR). We are interested in their propagation in the interstellar medium (ISM) after they leave the shock neighborhood where they are accelerated. We first compare the results of a simple model with observations of SNRs; cosmic-rays escaped from these SNRs seem to be illuminating molecular clouds around the SNRs. In this model, we take the diffusion coefficient for the cosmic-rays as a free parameter. We found that the coefficient around the SNRs is less than 1% of that away from them. Following this study, we construct a theoretical model, in which the diffusion coefficient is theoretically calculated. We found that the cosmic rays with energies of less than ~TeV excite Alfvén waves around the SNR on a scale of the SNR itself. Thus, even if the cosmic rays can leave the shock, scattering by the waves prevents them from moving further away from the SNR.

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