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Title:
The bulk expansion of the supernova remnant Cassiopeia A at 151 MHz
Authors:
Agüeros, M. A.; Green, D. A.
Affiliation:
AA(Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE), AB(Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 4, pp. 957-965. (MNRAS Homepage)
Publication Date:
05/1999
Origin:
MNRAS
MNRAS Keywords:
TECHNIQUES: INTERFEROMETRIC, ISM: INDIVIDUAL: CAS A, SUPERNOVA REMNANTS, RADIO CONTINUUM: ISM
DOI:
10.1046/j.1365-8711.1999.02504.x
Bibliographic Code:
1999MNRAS.305..957A

Abstract

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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