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Long-baseline interferometric observations of the supernova remnant Cassiopeia A on projected baselines of up to 34,000 lambda reveal that its structure at 81.5 MHz is remarkably similar to that observed with the VLA at 1381 MHz. Variations in spectral index over the source are apparent, but the measurements show that it does not contain a single steep-spectrum compact component with a flux density of more than a few Jy. These new findings are in sharp contrast with much of the existing low-frequency data on the remnant.
|Glasgow Author(s):||Woan, Prof Graham|
|Authors:||Woan, G., and Dufflett-Smith, P.J.|
|College/School:||College of Science and Engineering > School of Physics and Astronomy|
|Journal Name:||Monthly Notices of the Royal Astronomical Society|
|Publisher:||Wiley-Blackwell Publishing Ltd.|