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A Merged Catalog of Clusters of Galaxies from Early SDSS Data | | Neta A. Bahcall
; Timothy A. McKay
; James Annis
; Rita Kim
; Feng Dong
; Sarah Hansen
; Tomotsugu Goto
; James E. Gunn
; Chris Miller
; Robert C. Nichol
; Marc Postman
; Don Schneider
; Josh Schroeder
; Wolfgang Voges
; Jon Brinkmann
; Masataka Fukugita ( Princeton
; Michigan
; Fermilab
; JHU
; Chicago
; CMU
; STScI
; PSU
; MPI
; APO
; | | Date: |
12 May 2003 | | Journal: | Astrophys.J.Suppl. 148 (2003) 243-274 | | Subject: | astro-ph | | Affiliation: | 10), Masataka Fukugita (11) ( Princeton, Michigan, Fermilab, JHU, Chicago, CMU, STScI, PSU, MPI, (10) APO, (11) Tokyo | | Abstract: | We present a catalog of 799 clusters of galaxies in the redshift range z_est = 0.05 - 0.3 selected from ~400 deg^2 of early 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 Lambda >= 40 (Matched-Filter) and N_gal >= 13 (maxBCG), corresponding to typical velocity dispersion of sigma_v >~ 400 km s^{-1} and mass (within 0.6 h^{-1) Mpc radius) >~ 5*10^{13} h^{-1} M_sun. This threshold is below Abell richness class 0 clusters. The average space density of these clusters is 2*10^{-5} h^3 Mpc^{-3}. All NORAS X-ray clusters and 53 of the 58 Abell clusters in the survey region are detected in the catalog; the 5 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 AGNs, and, with proper correction for the relevant selection functions, also for statistical analyses of clusters. | | Source: | arXiv, astro-ph/0305202 | | Services: | Forum | Review | PDF | Favorites | |
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