Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-07-30
Astronomy and Astrophysics
Astrophysics
6 pages, Latex, 4 eps figures. To appear in the proceedings of the OCIW/Pasadena Workshop on Photometric Redshift, held April
Scientific paper
The color-magnitude relation (CMR) of early-type galaxies in clusters provides a powerful tool for finding clusters and determining photometric redshifts for clusters using two-filter imaging data. We demonstrate the high accuracy of photometric redshifts attainable using the CMR by applying the technique to a sample of 45 Abell clusters with known redshifts. Furthermore, by using the red sequence of galaxies from the CMR, we have developed an extremely efficient technique for detecting clusters and groups of galaxies. We demonstrate this using both observed photometric catalogs with redshifts (from the CNOC2 Survey) and simulations.
Gladders Michael D.
Lopez-Cruz Omar
Yee Howard K. C.
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