Cosmological Constraints from the Sloan Digital Sky Survey MaxBCG Cluster Catalog

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Title: Cosmological Constraints from the Sloan Digital Sky Survey MaxBCG Cluster Catalog
Creators: Rozo, Eduardo; Wechsler, Risa H.; Rykoff, Eli S.; Annis, James T.; Becker, Matthew R.; Evrard, August E.; Frieman, Joshua A.; Hansen, Sarah M.; Hao, Jiangang; Johnston, David E.; Koester, Benjamin P.; McKay, Timothy A.; Sheldon, Erin S.; Weinberg, David H.
Keywords: cosmological parameters
cosmology: observations
large-scale structure of universe
Issue Date: 2010-01-01
Publisher: American Astronomical Society
Citation: Eduardo Rozo et al, "Cosmological Constraints from the Sloan Digital Sky Survey MaxBCG Cluster Catalog," The Astrophysical Journal 708, no. 1 (2010), doi:10.1088/0004-637X/708/1/645
DOI: 10.1088/0004-637X/708/1/645
Abstract: We use the abundance and weak-lensing mass measurements of the Sloan Digital Sky Survey maxBCG cluster catalog to simultaneously constrain cosmology and the richness-mass relation of the clusters. Assuming a flat ΛCDM cosmology, we find σ_8(Ω_m /0.25)^0.41 = 0.832 ± 0.033 after marginalization over all systematics. In common with previous studies, our error budget is dominated by systematic uncertainties, the primary two being the absolute mass scale of the weak-lensing masses of the maxBCG clusters, and uncertainty in the scatter of the richness-mass relation. Our constraints are fully consistent with the WMAP five-year data, and in a joint analysis we find σ_8 = 0.807 ± 0.020 and Ω_m = 0.265 ± 0.016, an improvement of nearly a factor of 2 relative to WMAP5 alone. Our results are also in excellent agreement with and comparable in precision to the latest cosmological constraints from X-ray cluster abundances. The remarkable consistency among these results demonstrates that cluster abundance constraints are not only tight but also robust, and highlight the power of optically selected cluster samples to produce precision constraints on cosmological parameters.
ISSN: 1538-4357
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