Improvement of the Richness Estimates of maxBCG Clusters

Details Improvement of the Richness Estimates of maxBCG Clusters Improvement of the Richness Estimates of maxBCG Clusters

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...703..601r&link_type=abstract

The Astrophysical Journal, Volume 703, Issue 1, pp. 601-613 (2009).

Astronomy and Astrophysics

Astronomy

24

Cosmology: Observations, Methods: Data Analysis

Scientific paper

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 LX -richness relation, from σ_{ln L_X}^2=(0.86± 0.02)^2 to σ_{ln L_X}^2=(0.69± 0.02)^2. Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the LX -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 LX -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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