poor cluster: An irregularly shaped cluster that contains fewer than 1000 galaxies, many spiral, and no giant ellipticals.
poor cluster galaxy cluster with only a few tens of galaxies. Population I (stars): younger stars including the hot blue stars that have slightly elliptical orbits closely aligned with the disk plane of the Milky Way Galaxy.
The Mamajek 2 cluster appears to be a poor cluster remnant analogous to the Ursa Major Moving Group, but 7 times more distant (approximately 170 parsecs away).
with concentration generally increasing leftward. However, some poor clusters do have cD galaxies, perhaps the result of runaway merging.
For example, in most standard cosmological models most massive clusters form from successive mergers of smaller, less massive (and more common) poor clusters and groups.
Many scenarios have been suggested to explain these subpopulations, including violent gas-rich galaxy mergers, the accretion of dwarf galaxies, and multiple phases of star formation in a single galaxy. In our Milky Way, the metal-poor clusters are ...
matter could have about five times the mass of all the galaxies and hot gas in a cluster combined. Galaxy clusters are classified by their appearance as being either regular or irregular clusters. They are also classified as rich or poor clusters ...
 See also: Galaxy, Cluster, Clusters, Galaxies, Mass
  
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