Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918005k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #180.05; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the recently published maxBCG cluster catalog and the imaging survey of the SDSS, we make background-subtracted measurements of the color, spatial, and luminosity distributions of cluster galaxies at z < 0.3. The accuracy of the photometric redshifts and the mass proxies of maxBCG allow reliable measurements of these observables as a function of richness and redshift.
The resulting radial, color, and luminosity profiles are converted into filters that are closely matched to observed cluster properties. These filters are then used to remeasure the richnesses of maxBCG clusters. Because the filters contain statistical information about observed cluster galaxy populations, they should generate a more informative mass proxy. Dynamical mass estimates confirm that this new richness measurement indeed contains more mass information than the basic Ngalsr200 richness provided with the maxBCG catalog. Techniques such as this will likely be a key component of future wide-field optical cluster surveys.
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