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Late Radio Emission from SN 1993J: Evidence for Synchrotron Self-Absorption

Published online by Cambridge University Press:  13 May 2016

M.A. Perez-Torres ,
A. Alberdi  and
J.M. Marcaide
M.A. Perez-Torres
Affiliation:
1 Depto. de Astronomía, Univ. Valencia, E-46100 Burjassot, Spain
A. Alberdi
Affiliation:
2 Instituto Astrofísica Andalucía, CSIC, E-18080 Granada, Spain
J.M. Marcaide
Affiliation:
1 Depto. de Astronomía, Univ. Valencia, E-46100 Burjassot, Spain

Abstract

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The standard model for radio supernovae considers the synchrotron radio emission to be only partially absorbed by ionized thermal electrons in the circumstellar wind of the progenitor star. However, for the best studied radio supernova, SN 1993J, we present evidence of synchrotron self-absorption based on modelfits to all available radio data. We show that while external absorption is the main absorption mechanism at early times, synchrotron self-absorption is the dominant mechanism at late epochs.

Type
Supernovae, Pulsars, and the Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 384 - 385
Copyright
Copyright © Astronomical Society of the Pacific 2001