The bulk expansion of the supernova remnant Cassiopeia A at 151 MHz

Details The bulk expansion of the supernova remnant Cassiopeia A at 151 MHz The bulk expansion of the supernova remnant Cassiopeia A at 151 MHz

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.305..957a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 4, pp. 957-965.

Astronomy and Astrophysics

Astronomy

16

Techniques: Interferometric, Ism: Individual: Cas A, Supernova Remnants, Radio Continuum: Ism

Scientific paper

We present observations of the supernova remnant Cassiopeia A made over 13 yr at 151 MHz with the Cambridge Low-Frequency Synthesis Telescope. These observations have been used to study the contraction of well-defined minima in the visibility (or u,v) plane, in order to determine the bulk expansion of the radio emission from Cas A. These observations show steady contraction of the first and second minima, corresponding to expansion time-scales of ~ 400-500 yr. These time-scales are less than those inferred from the expansion of compact radio knots in Cas A, and imply, provided that shape changes are not significant, that the remnant is in the transition between free expansion and Sedov-Taylor phases.

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