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The Bautz-Morgan classification was developed in 1970 by Laura P. Bautz and William Wilson Morgan to categorize galaxy clusters based on their morphology. It defines three main types: I, II, and III. Intermediate types (I-II, II-III) are also allowed. A type IV was initially proposed, but later redacted before the final paper was published. ==Classificiation== * 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.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bautz-Morgan classification」の詳細全文を読む スポンサード リンク
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