About Butcher-Oemler Effect

The Butcher–Oemler Effect is a scientific hypothesis suggesting the cores of galaxy clusters at intermediate redshift contain a larger fraction of blue galaxies than do the cores of low redshift clusters. The claim was first put forward by Harvey Butcher and Augustus Oemler in a 1978 Astrophysical Journal paper.

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Facts from Wikidata (CC0).

Butcher-Oemler Effect

hypothesis suggesting the cores of galaxy clusters at intermediate redshift contain a

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