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<ri:Resource created="2009-06-26T13:58:15Z" 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>The 400d cluster Survey</title><shortName>J/ApJS/172/561</shortName><identifier>ivo://CDS.VizieR/J/ApJS/172/561</identifier><altIdentifier>doi:10.26093/cds/vizier.21720561</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Burenin R.A.</name></creator><creator><name>Vikhlinin A.</name></creator><creator><name>Hornstrup A.</name></creator><creator><name>Ebeling H.</name></creator><creator><name>Quintana H.,Mescheryakov A.</name></creator><date role="Updated">2009-06-26T14:06:28Z</date><date role="Created">2009-06-26T13:58:15Z</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>x-ray-sources</subject><subject>surveys</subject><description>We present a catalog of galaxy clusters detected in a new ROSAT PSPC survey. The survey is optimized to sample, at high redshifts, the mass range corresponding to T&gt;5keV clusters at z=0. Technically, our survey is the extension of the 160 square degree survey (160d, Cat. J/ApJ/502/558). We use the same detection algorithm, thus preserving high quality of the resulting sample; the main difference is a significant increase in sky coverage. The new survey covers 397deg^2^ and is based on 1610 high Galactic latitude ROSAT PSPC pointings, virtually all pointed ROSAT data suitable for the detection of distant clusters. The search volume for X-ray luminous clusters within z&lt;1 exceeds that of the entire local universe (z&lt;0.1). We detected 287 extended X-ray sources with fluxes f&gt;1.4x10^-13^ergs/s/cm^2^ in the 0.5-2keV energy band, of which 266 (93%) are optically confirmed as galaxy clusters, groups or individual elliptical galaxies.</description><source format="bibcode">2007ApJS..172..561B</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/172/561</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/VII/110">VII/110 : Rich Clusters of Galaxies (Abell+ 1989)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/274/75">J/MNRAS/274/75 : Redshifts of ROSAT X-ray brightest clusters (Crawford+, 1995)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/502/558">J/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/301/881">J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/514/148">J/ApJ/514/148 : ROSAT survey of bright galaxies clusters (De Grandi+, 1999)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/594/154">J/ApJ/594/154 : 160 square degree ROSAT survey (Mullis+, 2003)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/425/367">J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/172/561</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/172/561</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South 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