The expansion of Cassiopeia A as seen in X-rays

Details The expansion of Cassiopeia A as seen in X-rays The expansion of Cassiopeia A as seen in X-rays

1998-06-24

arxiv.org/abs/astro-ph/9806319v2

Astronomy and Astrophysics

Astrophysics

7 pages; 4 figures. Accepted by Astronomy and Astrophysics (August 3, 1998). Major text changes have been made, mostly in sect

Scientific paper

We have for the first time measured the overall expansion rate of the supernova remnant Cas A as seen in X-rays using ROSAT and Einstein HRI images with time differences up to almost 17 years. The overall expansion timescale of Cas A is found to be 501 plusminus 15 yr. This is significantly shorter than the timescale based on high resolution radio data. Although the results clearly indicate that Cas A is not anymore in the free expansion phase,the discrepancy between the radio and X-ray timescales cannot be easily understood. Furthermore, the expansion rate is incompatible with that predicted by a self-similar model for a supernova remnant ploughing through the wind of its progenitor.

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