- Expansion of SN 1993J: new lambda lambda 6 and 13 cm images,
J.M. Marcaide, A. Alberdi, E. Ros, P. Diamond, I.I. Shapiro, J.C. Guirado
D.L. Jones, F. Mantovani, M.A. Pérez-Torres, R.A. Preston, R.T.
Schilizzi, C. Trigilio, & A. R. Whitney, Vistas in Astronomy, (special
issue), Proceedings of the 3rd EVN/JIVE VLBI Symposium, eds.
M. Garret & F. Colomer, 41:185-191 (1997)
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- Abstract
Radio supernovae are rare events among supernovae, usually taking place
in distant galaxies. In recent years, great progress has been made
in the study of radio supernovae with high angular resolution, due
to advances inthe VLBI technique and to the lucky occurrence of the
powerful supernova SN 1993J in M81 only 3.6 Mpc distant. Its spatial
structure has been unveiled and its expansion rate determined at
3.6cm. Here we present new preliminary VLBI results on the expansion
of this supernova at 6 and 13 cm. We resolve the shell at both
wavelenghts. The size estimates at 6cm indicate a lower expansion rate than
previously estimated. This may be the first evidence of deceleration.
Eduardo Ros
ros@mpifr-bonn.mpg.de