Academic Commons

Articles

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

Agüeros, Marcel Andre; Green, D.A.

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.

Subjects

Files

Also Published In

Title
Monthly Notices of the Royal Astronomical Society
DOI
https://doi.org/10.1046/j.1365-8711.1999.02504.x

More About This Work

Academic Units
Astronomy
Publisher
Oxford University Press
Published Here
March 25, 2014
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.