Irregular Clusters
Irregular clusters do not have a well-defined center, but are often made up of loose groups of small clusters. They contain all types of galaxies: spirals, irregulars and ellipticals.
Irregular Cluster - A cluster of galaxies that lacks a symmetrical shape and structure
Irregular Galaxy - A galaxy having an amorphous shape and lacking symmetry ...
An irregular cluster of about 2500 galaxies (z = 0.004), including the giant elliptical M87 (the galaxy of greatest known mass).
Virgo Infall ...
A diffuse, irregular cluster of about 500 galaxies (z = 0.0183) (richness class 2) dominated by and centered on the Seyfert galaxy NGC 1275 (Perseus A). Mass required to bind the cluster, greater than 1015 M; mass of cluster, about 2 × 1015 M. [H76] ...
It is a poor, irregular cluster with some 20 certain members including the Milky Way Galaxy, the Andromeda Galaxy, the Triangulum, four irregular galaxies, and about 13 intermediate or dwarf ellipticals.
Irregular clusters are not too centrally condensed with a somewhat nonspherical overall shape. They contain a few to hundreds of galaxies. Our Local Group (below) is an example of an irregular cluster of galaxies.
Irregular Galaxy Cluster: Clusters of galaxies that are not too centrally condensed, with a somewhat nonspherical overall shape, containing a few galaxies up to hundreds of galaxies. Our local group is an example of an irregular cluster of galaxies.
 See also: Galaxy, Galaxies, Cluster, Regular cluster, Universe
  
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