Editing Galaxy cluster (section)

==Classification==
There are many classification systems for galaxy clusters, based on characteristics such as shape symmetry, X-ray [[luminosity]], and dominant galaxy type.<ref>{{Cite web |title=Clusters and Superclusters of Galaxies |url=https://ned.ipac.caltech.edu/level5/Sept01/Bahcall2/Bahcall2_11.html |access-date=2025-02-17 |website=ned.ipac.caltech.edu}}</ref> The [[Bautz–Morgan classification|Bautz-Morgan classification]] sorts clusters into types I, II, and III based on the relative brightness of their galaxies–type I with greatest contrast and type III with the least.<ref>{{Cite journal |last=Bautz |first=L. P. |last2=Morgan |first2=W. W. |date=1970-12-01 |title=On the Classification of the Forms of Clusters of Galaxies |url=https://ui.adsabs.harvard.edu/abs/1970ApJ...162L.149B/abstract |journal=The Astrophysical Journal |volume=162 |pages=L149 |doi=10.1086/180643 |issn=0004-637X}}</ref><ref>{{Cite web |title=1978ApJ...222...23D Page 23 |url=https://adsabs.harvard.edu/full/1978ApJ...222...23D |access-date=2025-02-17 |website=adsabs.harvard.edu}}</ref>