Galaxy clusters as biased tracers of the galaxy distribution

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Clusters, Galactic Structure, Spatial Distribution, Angular Correlation, Dark Matter, Frequency Distribution, Universe

Scientific paper

The correlation properties of different samples of galaxy clusters, which are obtained by cutting the Lick catalogue at different values of the galaxy surface density are investigated. This kind of cluster-finding algorithm is equivalent to the application of the biasing prescription to the lick galaxy distribution. For all the samples, it is found that the angular two-point correlation function can be well approximated by a power law with the same logarithmic slope gamma about 2, in the angular range 0.5 - 10 deg. In addition, the correlation amplitude turns out to depend on the value of the limiting threshold, used to identify clusters, in exactly the same way as predicted by the biased model of galaxy formation.

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