Other
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..807k&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 807-811
Other
4
Electron Acceleration, Interstellar Matter, Mathematical Models, Radio Emission, Supernova Remnants, Electron Distribution, Plasma Heating, Shock Fronts, Shock Waves, Time Dependence
Scientific paper
Diffusive acceleration of electrons by the blast wave of Supernova Remnant 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 coeficient in this model, the observations indicate that the compression ratio of the gas subshock embedded in the blast wave is approximately 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 cosmic rays.
Ball Lewis
Duffy Peter
Kirk John G.
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