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Radio Emission From Snr 1987A1

Published online by Cambridge University Press:  12 April 2016

J. G. Kirk ,
P. Duffy  and
Lewis Ball
J. G. Kirk
Affiliation:
Max-Planck-Institut für Kernphysik, W-6900 Heidelberg, Germany
P. Duffy
Affiliation:
Max-Planck-Institut für Kernphysik, W-6900 Heidelberg, Germany
Lewis Ball
Affiliation:
Research Centre for Theoretical Astrophysics, University of Sydney, N.S.W. 2006, Australia

Abstract

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Diffusive acceleration of electrons by the blast wave of SNR 1987A is shown to provide a reasonable fit to observations of the radio emission since it reappeared in 1990 July. As well as determining the diffusion coefficient in this model, the observations indicate that the compression ratio of the gas subshock embedded in the blast wave is ~2.7, much lower than the value of 4 expected of a strong shock front. We propose that protons accelerated by the shock front itself cause the weakening of the subshock by both heating and accelerating the upstream plasma, producing a structure with a precursor to the gas subshock. Preliminary calculations using a fluid model for the energetic particle population indicate that these effects can significantly weaken the subshock just a few years after the explosion, if the same rate of particle injection is assumed as in other models of the acceleration of cosmic rays.

Subject headings: acceleration of particles — ISM: individual (SNR 1987 A) — radio continuum: ISM — shock waves

Type
Pulsars, Supernovae, and Supernova Remnants
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 807 - 811
Copyright
Copyright © The American Astronomical Society 1994

Footnotes

1

Invited contribution presented at IAU Colloquium 142, College Park, 1993 January.

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