redMaPPer. I. ALGORITHM AND SDSS DR8 CATALOG

E. S. Rykoff

doi:10.1088/0004-637X/785/2/104

2014-04-01

645

DOI：10.1088/0004-637X/785/2/104

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摘要

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We describe redMaPPer, a new red sequence cluster finder specifically designed to make optimal use of ongoing and near-future large photometric surveys. The algorithm has multiple attractive features: (1) it can iteratively self-train the red sequence model based on a minimal spectroscopic training sample, an important feature for high-redshift surveys. (2) It can handle complex masks with varying depth. (3) It produces cluster-appropriate random points to enable large-scale structure studies. (4) All clusters are assigned a full redshift probability distribution P(z). (5) Similarly, clusters can have multiple candidate central galaxies, each with corresponding centering probabilities. (6) The algorithm is parallel and numerically efficient: it can run a Dark Energy Survey-like catalog in similar to 500 CPU hours. (7) The algorithm exhibits excellent photometric redshift performance, the richness estimates are tightly correlated with external mass proxies, and the completeness and purity of the corresponding catalogs are superb. We apply the redMaPPer algorithm to similar to 10,000 deg(2) of SDSS DR8 data and present the resulting catalog of similar to 25,000 clusters over the redshift range z is an element of [0.08, 0.55]. The redMaPPer photometric redshifts are nearly Gaussian, with a scatter sigma(z) approximate to 0.006 at z approximate to 0.1, increasing to sigma(z) approximate to 0.02 at z approximate to 0.5 due to increased photometric noise near the survey limit. The median value for |Delta z|/(1 + z) for the full sample is 0.006. The incidence of projection effects is low (<= 5%). Detailed performance comparisons of the redMaPPer DR8 cluster catalog to X-ray and Sunyaev-Zel'dovich catalogs are presented in a companion paper.

Keyword:

galaxies: clusters: general

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Astrophysical Journal

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Stanford University

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university of zurich

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united states department of energy (doe)

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University of Michigan

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university of michigan system

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