Query : 2001A&A...374..997P

2001A&A...374..997P - Astronomy and Astrophysics, volume 374, 997-1002 (2001/8-2)

The role of synchrotron self-absorption in the late radio emission from SN 1993J.


Abstract (from CDS):

The standard model for radio supernovae considers that the observed synchrotron radio emission arises from the high-energy shell that results from the strong interaction between the expanding supernova ejecta and the circumstellar medium. This emission is considered to be only partially absorbed by ionized thermal electrons in the circumstellar wind of the progenitor star. Based on a study of the radio light curves of the type II supernova SN1993J, we present evidence of synchrotron self-absorption. Our modeling of the radio light curves requires a large initial magnetic field, of about 30 Gauss, and the existence of an (initially) highly-relativistic population of electrons. We also show that while at early epochs the dominant absorption mechanism is external absorption by thermal electrons, at late epochs and long wavelengths the dominant absorption mechanism is synchrotron self-absorption. Consequently, the spectral turnover takes place at much shorter wavelengths than expected in the standard model, and at long wavelengths (≥90cm at current epochs) the flux predictions depart substantially from those of the standard model.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal radiative transfer - supernovae: general - supernovae: individual: SN 1993J

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 320 1
2 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1390 1
3 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4359 3

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