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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
general
The shape, expansion rate and distance of supernova 1993J from VLBI measurements
Nature, Volume 368, No. 6472, Year 1994
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Description
SUPERNOVA 1993J is one of the closest supernovae discovered this century, allowing observations with very high linear resolution. Radio emission from the supernova became visible within days of the first optical peak, and has remained strong, making this an ideal source for very-long-baseline interferometry (VLBI) investigations1-7. Here we report the results of a series of VLBI observations, made from one to three months after the supernova explosion. We find that the supernova is circularly symmetric, which is somewhat surprising in view of suggestions that the progenitor was a member of a binary system 8,9, and the asymmetry implied by optical observations10. The supernova shows no sign of deceleration, and the expansion velocities that we estimate from the VLBI measurements are consistent with the maximum optical line velocities11, suggesting that the radio emission indeed arises from the shock front, where the ejecta are hitting the gas that surrounded the progenitor star. We combine the angular expansion rate determined by the VLBI data with the optically derived expansion speed to estimate a distance to M81 of 4.0 ± 0.6 Mpc, consistent with the value obtained from measurements of Cepheid variables in M81, 3.63 ±0.34 Mpc (ref. 12). © 1994 Nature Publishing Group.
Authors & Co-Authors
Bartel, Norbert
Canada, Toronto
York University
Bietenholz, Michael F.
Canada, Toronto
York University
Rupen, Michael P.
United States, Socorro
National Radio Astronomy Observatory Socorro
Conway, John E.
United States, Socorro
National Radio Astronomy Observatory Socorro
Beasley, Anthony J.
United States, Socorro
National Radio Astronomy Observatory Socorro
Romney, Jonathan D.
United States, Socorro
National Radio Astronomy Observatory Socorro
Altunin, Valery I.
United States, Pasadena
California Institute of Technology
Jones, Dayton L.
United States, Pasadena
California Institute of Technology
Venturi, Tiziana
Italy, Bologna
Istituto Di Radioastronomia, Bologna
Umana, Grazia
Italy, Rome
Consiglio Nazionale Delle Ricerche
McCall, Marshall L.
Canada, Toronto
York University
Richer, Michael G.
Canada, Toronto
York University
Weiler, Kurt W.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Dyk, Schuyler D.Van
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Berkeley
University of California, Berkeley
Panagia, Nino
United States, Baltimore
Space Telescope Science Institute
Cannon, Wayne H.
Canada, Toronto
York University
Statistics
Citations: 50
Authors: 16
Affiliations: 13
Identifiers
Doi:
10.1038/368610a0
ISSN:
00280836
Research Areas
Environmental