Subcluster
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A subcluster or subclump (or subgroup) is a term used in galactic astronomy to include an identifiable isolated grouping of galaxies within a cluster of galaxies, typically centered on a large dominant member.
Examples include the three subclusters within the Virgo cluster centered on M87, M86, and M49.
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External link
- California Institute of Technology site on subclusters within the Virgo cluster.