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
- 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
| Example | Type | Notes | |
|---|---|---|---|
|
Abell 2199 | Type I | |
|
Abell S740 | Type I-II | |
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|
Coma Cluster | Type II | |
|
Abell 1689 | Type II-III | |
|
Virgo Cluster | Type III | |
| Type IIIS | |||
| Type IIIE |
See also
- AGN classification
- Galaxy morphological classification
- List of Abell clusters
- Planetary classifications
- Stellar classification
References
- ↑ Bautz, L. P.; Morgan, W. W. (December 1970). "On the Classification of the Forms of Clusters of Galaxies" (PDF). Astrophysical Journal 162: L149. doi:10.1086/180643. A&AA ID. AAA004.160.015. Bibcode: 1970ApJ...162L.149B. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1970ApJ...162L.149B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. Retrieved March 10, 2012.
- ↑ 2.0 2.1 Bautz, Laura P.; Morgan, W. W. (September 1970). "Preliminary Classification of Clusters of Galaxies" (PDF). Bulletin of the American Astronomical Society 2: 294. A&AA ID. AAA004.160.006. Bibcode: 1970BAAS....2R.294B. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1970BAAS....2R.294B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. Retrieved March 10, 2012.
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