Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 191, Issue 2, Pages 254-274Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/191/2/254
Keywords
catalogs; galaxies: clusters: general; methods: statistical
Categories
Funding
- NSF [AST 0807304, AST-0708150]
- DoE [DE-FG02-95ER40899, DE-AC02-76SF00515]
- NASA [NNX10AF61G]
- Michigan Center for Theoretical Physics
- Alfred P. Sloan Foundation
- US Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- NASA [NNX10AF61G, 133892] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien [0807304] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0807304] Funding Source: National Science Foundation
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We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data. The algorithm detects clusters by identifying the red-sequence plus brightest cluster galaxy (BCG) feature, which is unique for galaxy clusters and does not exist among field galaxies. Red-sequence clustering in color space is detected using an Error Corrected Gaussian Mixture Model. We run GMBCG on 8240 deg(2) of photometric data from SDSS DR7 to assemble the largest ever optical galaxy cluster catalog, consisting of over 55,000 rich clusters across the redshift range from 0.1 < z < 0.55. We present Monte Carlo tests of completeness and purity and perform cross-matching with X-ray clusters and with the maxBCG sample at low redshift. These tests indicate high completeness and purity across the full redshift range for clusters with 15 or more members.
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