Bautz–Morgan classification

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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

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  • 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]

Examples

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Example Type Notes
File:Monster Galaxies Lose Their Appetite With Age 03.jpg Abell 2199 Type I
File:Abell S740.jpg Abell S740 Type I-II
File:Coma Cluster of Galaxies (visible, wide field).jpg Coma Cluster Type II
File:New Hubble view of galaxy cluster Abell 1689.jpg Abell 1689 Type II-III
File:ESO-M87.jpg Virgo Cluster Type III
Type IIIS
Type IIIE

See also

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References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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