Comments on the Reality of the Butcher-Oemler Effect

  • David C. Koo
Part of the Astrophysics and Space Science Library book series (ASSL, volume 141)


We propose that some of the evidence, especially recent spectroscopic data, for evolution in the properties of galaxies in the central cores of high redshift clusters remain questionable. Problems include biased selection of the clusters, contamination by extraneous galaxies, and non-inclusion of several corrections including the expansion of the universe. In particular, we suggest that clusters viewed approximately in the plane of flattened superclusters will preferentially be selected, thus magnifying the contamination by other clusters and “field” galaxies. The ratio of the accepted volume to that of the cluster core may easily reach beyond 400 for redshifts z greater than 0.3. Reasonable assumptions on the density structure of clusters and superclusters predict 10% or more contamination as observed.


Cluster Galaxy Cluster Member High Redshift Cluster Core Distant Cluster 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • David C. Koo
    • 1
  1. 1.Space Telescope Science InstituteBaltimoreUSA

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