I Clusters at center and periphery

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The Sloan Digital Sky Survey has identified clusters of galaxies where a majority are concentrated at the center and periphery, with a noticeable decrease in density in the intermediate regions. This distribution pattern suggests that gravitational forces and interactions among galaxies play a significant role in their positioning. The central region is likely influenced by stronger gravitational pull, while the periphery may host galaxies that are less affected by these forces. Understanding this clustering can provide insights into galaxy formation and evolution. The discussion highlights the importance of gravitational dynamics in shaping the structure of galaxy clusters.
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An acquaintance has told me that the Sloan Digital Sky Survey found clusters of galaxies in which most of the galaxies were divided between the center and the periphery, with a smaller density of galaxies in between. Is this case, and if so, why?
 
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nomadreid said:
the center and the periphery
The center and periphery of what?
 
berkeman said:
The center and periphery of what?
of the cluster
 

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