Late radio emission from SN 1993J: Evidence for synchrotron self-absorption

Details Late radio emission from SN 1993J: Evidence for synchrotron self-absorption Late radio emission from SN 1993J: Evidence for synchrotron self-absorption

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..384p&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Physics

Scientific paper

Type II supernovae are born from exploding stars that have intensively lost material through the last stages of their lives in the form of a strong stellar wind. The shock formed shortly after the collapse of the presupernova star blasts into the surrounding medium, resulting in the formation of a shell from which synchrotron radio emission arises. The standard interaction model (Chevalier 1982) considers this emission to be optically thin and partially absorbed due to thermal electrons in the circumstellar wind. Here we report the results of model calculations, applied to the radio light curves of supernova SN 1993J. We consistently took into account synchrotron self-absorption, and found that a good fit to the radio light curves of SN 1993J requires unexpectedly large initial magnetic fields, of about 30 Gauss. In addition, we show that while at early epochs the main absorption mechanism is the external absorption from thermal electrons, at late epochs it is synchrotron self-absorption that dominates. If our model is correct, we expect SN 1993J to currently show a break in its spectra above ~ λ 90cm. Therefore, sensitive single-dish monitoring of SN 1993J at wavelengths around and above ~ 90 cm is necessary to test this prediction.

Affiliated with

Also associated with

No associations

Rating

Late radio emission from SN 1993J: Evidence for synchrotron self-absorption does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Late radio emission from SN 1993J: Evidence for synchrotron self-absorption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Late radio emission from SN 1993J: Evidence for synchrotron self-absorption will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1363236