Optical Galaxy Cluster Detection in SDSS DR5

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We report here on the detection of 150,000 galaxy cluster/group candidates based on g', r', and i' imaging (|b| > 30 deg) of the Sloan Digital Sky Survey DR5. Galaxy clusters are detected as overdensities based on the presence of the early-type cluster galaxy red sequence using the Voronoi Tessellation and Percolation technique (VTP). Redshift estimates are derived from the position of the cluster red sequence in the color-magnitude plane. Optical richness measurements, based on the cluster center-galaxy correlation amplitude (Bgc), have been derived. Cluster finding mass-dependent selection functions have been measured based on extensive simulations. Our catalog offers the community a rich resource from which galaxy clusters and groups can be studied.

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