Finding Clusters in the Blanco Cosmology Survey

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present an algorithm for the detection of galaxy clusters from multi-band optical ground-based observations using a maximum likelihood approach based closely on an earlier adaptive matched filter technique, to be used for finding clusters in the Blanco Cosmology Survey. For our filter, we use an empirically-determined model for cluster galaxy radial distribution, luminosity function, and elliptical color-magnitude relation and their variation with redshift to locate probable clusters in 3D space. Comparisons to a spectroscopically precise SDSS cluster catalog provide a robust test for our purely photometric method. We look to construct a set of clusters for correlation with those clusters soon to be detected through the Sunyaev-Zel'dovich effect in an overlapping field covered by the Atacama Cosmology Telescope's microwave experiment.

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