Galaxies within Clusters
	• Galaxies differ in these types (Abell) – In cD clusters galaxy distribution is very similar to star distribution in globular clusters. – Spiral-rich clusters and irregular clusters tend not to be symmetric or concentrated. – Spiral-poor clusters are intermediate cf. above. – In spiral rich clusters, all galaxy types similarly distributed and no mass segregation, but in cD and spiral-poor clusters, you don’t see spirals in the central regions where the most massive galaxies reside.