A merged catalog of clusters of galaxies from early sloan digital sky survey data

Neta A. Bahcall, Timothy A. McKay, James Annis, Rita S.J. Kim, Feng Dong, Sarah Hansen, Tomo Goto, James E. Gunn, Chris Miller, R. C. Nichol, Marc Postman, Don Schneider, Josh Schroeder, Wolfgang Voges, Jon Brinkmann, Masataka Fukugita

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86 Scopus citations


We present a catalog of 799 clusters of galaxies in the redshift range zest = 0.05-0.3 selected from ∼400 deg2 of early Sloan Digital Sky Survey (SDSS) commissioning data along the celestial equator. The catalog is based on merging two independent selection methods - a color-magnitude red-sequence maxBCG technique (B), and a hybrid matched filter method (H). The BH catalog includes clusters with richness Λ ≥ 40 (matched filter) and Ngal ≥ 13 (maxBCG), corresponding to typical velocity dispersion of σv≲400 km s-1 and mass (within 0.6 h-1 Mpc radius) ≲ 5 × 1013 h -1 M. This threshold is below Abell richness class 0 clusters. The average space density of these clusters is 2 × 10 -5 h3 Mpc-3. All NORAS X-ray clusters and 53 of the 58 Abell clusters in the survey region are detected in the catalog; the five additional Abell clusters are detected below the BH catalog cuts. The cluster richness function is determined and found to exhibit a steeply decreasing cluster abundance with increasing richness. We derive observational scaling relations between cluster richness and observed cluster luminosity and cluster velocity dispersion; these scaling relations provide important physical calibrations for the clusters. The catalog can be used for studies of individual clusters, for comparisons with other sources such as X-ray clusters and active galactic nuclei, and, with proper correction for the relevant selection functions, also for statistical analyses of clusters.

Original languageEnglish (US)
Pages (from-to)243-274
Number of pages32
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Oct 2003

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Catalogs
  • Cosmology: observations
  • Cosmology: theory
  • Galaxies: clusters: general
  • Large-scale structure of universe


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