Bautz–Morgan classification

Classification

• A type I cluster is dominated by a bright, large, supermassive cD galaxy; for example Abell 2029 and Abell 2199.
• A type II cluster contains elliptical galaxies whose brightness relative to the cluster is intermediate to that of type I and type III. The Coma Cluster is an example of a type II.
• A type III cluster has no remarkable members, such as the Virgo Cluster. Type III has two subdivisions, type IIIE and type IIIS
• * Type IIIE clusters do not contain many giant spirals
• * Type IIIS clusters contain many giant spirals
• The deprecated type IV was for clusters whose brightest members were predominantly spirals.

  Examples