Astrophysics (Index)About

X-ray luminous galaxy cluster

(term used for galaxy clusters found in X-ray surveys)

The term X-ray luminous galaxy cluster is generally used for a galaxy cluster discovered in an X-ray astronomical survey. An X-ray source can be identified as a likely galaxy cluster if it does not vary over observation time (much too rapid for such a large source), if it is an extended source, and if suitable counterparts in optical or infrared are found. The results will naturally be clusters that are bright in X-rays, and can include some at substantial redshift unlikely to be found otherwise. Identifying them in this manner allows the creation of data sets of distant galaxy clusters for study.

(galaxy clusters,X-ray)
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