Abstract
The supernova remnant Cas A is identified as an extended source of soft X-rays. No evidence is found for the presence of a compact X-ray source. There are indications of non-uniformity in the X-ray surface brightness.
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FABIAN, A., ZARNECKI, J. & CULHANE, J. The Soft X-Ray Structure of Cassiopeia A. Nature Physical Science 242, 18–20 (1973). https://doi.org/10.1038/physci242018a0
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DOI: https://doi.org/10.1038/physci242018a0
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