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[en] Although some quasistellar objects (QSOs) are known to be members of small groups of galaxies there is no known case of a QSO in a rich cluster of galaxies. Whether this has important implications for the nature of QSOs, or is simply a reflection of the difficulty of observing high-redshift clusters, is unclear. The discovery of a new QSO which provides perhaps the strongest evidence to date for quasar membership in a rich cluster is reported. (author)
Journal
Nature (London); ISSN 0028-0836; 
; v. 290(5806); p. 480-481
; v. 290(5806); p. 480-481