Journal Article

Non-thermal radiation from Type Ia supernova remnants

Paul P. Edmon, Hyesung Kang, T. W. Jones and Renyi Ma

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 4, pages 3521-3536
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI:
Non-thermal radiation from Type Ia supernova remnants

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We present calculations of expected continuum emissions from Sedov–Taylor phase Type Ia supernova remnants (SNRs), using the energy spectra of cosmic ray (CR) electrons and protons from non-linear diffusive shock acceleration simulations. A new, general-purpose radiative process code, cosmicp, was employed to calculate the radiation expected from CR electrons and protons and their secondary products. These radio, X-ray and gamma-ray emissions are generally consistent with current observations of Type Ia SNRs. The emissions from electrons in these models dominate the radio through X-ray bands. Decays of π0s from p–p collisions mostly dominate the gamma-ray range, although for a hot, low-density ISM case (nISM= 0.003 cm−3), the pion decay contribution is reduced sufficiently to reveal the inverse Compton contribution to TeV gamma-rays. In addition, we present simple scalings for the contributing emission processes to allow a crude exploration of model parameter space, enabling these results to be used more broadly. We also discuss the radial surface brightness profiles expected for these model SNRs in the X-ray and gamma-ray bands.

Keywords: acceleration of particles; radiation mechanisms: non-thermal; cosmic rays; ISM: supernova remnants

Journal Article.  11982 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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