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Scott effect

(bias toward finding clusters that have bright galaxies)

The Scott effect is a bias that effects 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.

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