Measurement of expansion velocity in a Supernova Remnant in Messier 82

Details Measurement of expansion velocity in a Supernova Remnant in Messier 82 Measurement of expansion velocity in a Supernova Remnant in Messier 82

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..535p&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 8-10, p. 535-538.

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the European VLBI Network (EVN) at 18 cm to study 5 young supernova remnants in the starburst galaxy M82. We have found clear evidence for expansion in the one of the shell sources (43.31+592) by comparing images at epochs separated by more than a decade. Between 1986 and 1997 this source has increased its diameter by /13.6+/-2 mas corresponding to an average expansion velocity of /9850+/-1500 km s-1. If we assume the remnant is in free expansion, this is consistent with a birth in the early 1960s. Hence this remnant is almost certainly younger than the strongest, most compact source (41.95+575) which is showing a much lower expansion velocity (<4000 km s-1).

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