COSMOLOGICAL CONSTRAINTS FROM THE SLOAN DIGITAL SKY SURVEY MaxBCG CLUSTER CATALOG
- Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States)
- Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, and SLAC National Accelerator Laboratory Stanford University, Stanford, CA 94305 (United States)
- Physics Department, University of California at Santa Barbara, 2233B Broida Hall, Santa Barbara, CA 93106 (United States)
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
- Department of Physics, University of Chicago, Chicago, IL 60637 (United States)
- Physics Department, University of Michigan, Ann Arbor, MI 48109 (United States)
- University of California Observatories and Department of Astronomy, University of California, Santa Cruz, CA 95064 (United States)
- Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208 (United States)
- Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
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 LAMBDACDM cosmology, we find sigma{sub 8}(OMEGA{sub m}/0.25){sup 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 sigma{sub 8} = 0.807 +- 0.020 and OMEGA{sub 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.
- OSTI ID:
- 21392438
- Journal Information:
- Astrophysical Journal, Vol. 708, Issue 1; Other Information: DOI: 10.1088/0004-637X/708/1/645; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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