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]

Classificiation

  • 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

Example Type Notes
100px Abell 2199 Type I
Abell S740.jpg Abell S740 Type I-II
Coma Cluster of Galaxies (visible, wide field).jpg Coma Cluster Type II
100px Abell 1689 Type II-III
100px Virgo Cluster Type III
Type IIIS
Type IIIE

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
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