Cosmological Constraints from Galaxy Clusters and Clustering in the Sloan Digital Sky Survey

Details Cosmological Constraints from Galaxy Clusters and Clustering in the Sloan Digital Sky Survey Cosmological Constraints from Galaxy Clusters and Clustering in the Sloan Digital Sky Survey

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335702t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #357.02; Bulletin of the American Astronomical Society, Vol. 41, p.499

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I will present constraints on cosmological parameters from a combination of cluster mass to galaxy number ratios combined with halo occupation analysis of the galaxy autocorrelation function. In two-point clustering, cosmology an bias are degenerate; good fits to the correlation function can be obtained for a wide variety of comologies. However, in order to match the observed level of clustering, each cosmology predicts a different number of galaxies per unit mass at the cluster mass scale. A combination of DR7 galaxy clustering results and M/N data from the weak lensing analysis of the maxBCG catalog break the degeneracy between cosmology and bias, leading to constraints on \Omega_m and \sigma_8 that are competitive with current CMB results.

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