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Bautz–Morgan classification

Galaxy cluster classification scheme From Wikipedia, the free encyclopedia

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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.[1] 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.[2]

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.[2]
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Examples

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See also

References

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