How one galaxy can be a cluster

Richard Mushotzky
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Richard Mushotzky: NASA Goddard Space Flight Center

Nature, 1997, vol. 388, issue 6638, 126-127

Abstract: One would expect a galaxy cluster to be a cluster of galaxies. Now a strange object has been discovered whose X-ray emission betrays it as a massive cluster, but which only contains one obvious galaxy at optical wavelengths. Odder still, this dark cluster is rich in heavy elements, presumably produced by stars - but what stars?

Date: 1997
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DOI: 10.1038/40521

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