1.6 GHz VLBI Observations of SN 1979C: almost-free expansion

Details 1.6 GHz VLBI Observations of SN 1979C: almost-free expansion 1.6 GHz VLBI Observations of SN 1979C: almost-free expansion

2009-07-06

arxiv.org/abs/0907.0780v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 4 figures; submitted to A&A on 14 May 2009. Accepted on 7 Jul 2009

Scientific paper

We report on 1.6 GHz Very-Long-Baseline-Interferometry (VLBI) observations of supernova SN 1979C made on 18 November 2002. We derive a model-dependent supernova size. We also present a reanalysis of VLBI observations made by us on June 1999 and by other authors on February 2005. We conclude that, contrary to our earlier claim of strong deceleration in the expansion, SN 1979C has been undergoing almost-free expansion ($m = 0.91\pm0.09$; $R \propto t^m$) for over 25 years.

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