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<ri:Resource created="2004-03-28T18:03:02Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>Catalog of clusters of galaxies from SDSS</title><shortName>J/ApJS/148/243</shortName><identifier>ivo://CDS.VizieR/J/ApJS/148/243</identifier><altIdentifier>doi:10.26093/cds/vizier.21480243</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Bahcall N.A.</name></creator><creator><name>McKay T.A.</name></creator><creator><name>Annis J.</name></creator><creator><name>Kim R.S.J.</name></creator><creator><name>Dong F.</name></creator><creator><name>Hansen S.</name></creator><creator><name>Goto T.,Gunn J.E.</name></creator><creator><name>Miller C.</name></creator><creator><name>Nichol R.C.</name></creator><creator><name>Postman M.</name></creator><creator><name>Schneider D.</name></creator><creator><name>Schroeder J.,Voges W.</name></creator><creator><name>Brinkmann J.</name></creator><creator><name>Fukugita M.</name></creator><date role="Updated">2004-03-28T18:05:14Z</date><date role="Created">2004-03-28T18:03:02Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>galaxy-clusters</subject><subject>redshifted</subject><description>We present a catalog of 799 clusters of galaxies in the redshift range z_est_=0.05-0.3 selected from ~400deg^2^ 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 {Lambda}&gt;=40 (matched filter) and Ngal&gt;=13 (maxBCG), corresponding to typical velocity dispersion of {sigma}_v_&gt;~400km/s and mass (within 0.6h^-1^Mpc radius) &gt;~5x10^13^h^-1^M_{sun}_. This threshold is below Abell richness class 0 clusters. The average space density of these clusters is 2x10^-5^h^3^/Mpc^3^. All NORAS (&lt;J/ApJS/129/435&gt;) 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.</description><source format="bibcode">2003ApJS..148..243B</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/148/243</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/129/435">J/ApJS/129/435 : NORAS galaxy cluster survey. I. 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