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Scott effect

(bias toward finding clusters that have bright galaxies)

The Scott effect is a bias that affects surveys of distant galaxy clusters, found by finding their constituent galaxies. The presence of unusually bright galaxies increases the chances that their cluster is identified, leading to a bias toward finding clusters with bright galaxies. Without compensating for this, it will appear that distant clusters have brighter galaxies or more bright galaxies than nearby ones. The Malmquist bias is something like this, but this effect relates to two levels of a hierarchy of objects: both galaxies and clusters.

(statistics,bias,galaxy clusters,galaxies,cosmology)
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