Journal
ASTROPHYSICAL JOURNAL
Volume 703, Issue 1, Pages 601-613Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/703/1/601
Keywords
cosmology: observations; methods: data analysis
Categories
Funding
- U. S. Department of Energy [DE-AC02-76SF00515, DE-FG02-95ER40899]
- Terman Fellowship
- NSF [AST 0807304, AST-0708150]
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
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Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the L(X)-richness relation, from sigma(ln) (2)(LX) = (0.86 +/- 0.02)(2) to sigma(ln) (2)(LX) = (0.69 +/- 0.02)(2). Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the L(X)-richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to the better treatment of galaxy color data. We also demonstrate the scatter in the L(X)-richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can easily be generalized to other mass tracers.
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