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<ri:Resource created="2013-01-23T10:27:19Z" 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>Triplets of galaxies in the SDSS-DR7</title><shortName>J/MNRAS/421/1897</shortName><identifier>ivo://CDS.VizieR/J/MNRAS/421/1897</identifier><altIdentifier>doi:10.26093/cds/vizier.74211897</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>O'Mill A.L.</name></creator><creator><name>Duplancic F.</name></creator><creator><name>Lambas D.G.</name></creator><creator><name>Valotto C.</name></creator><creator><name>Sodre L.Jr</name></creator><date role="Updated">2024-07-16T20:12:53Z</date><date role="Created">2013-01-23T10:27:19Z</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>galaxies</subject><subject>catalogs</subject><subject>redshifted</subject><description>We present a new catalogue of galaxy triplets derived from the Sloan Digital Sky Survey (SDSS) Data Release 7. The identification of systems was performed considering galaxies brighter than M_r_=-20.5 and imposing constraints over the projected distances, radial velocity differences of neighbouring galaxies and isolation. To improve the identification of triplets, we employed a data pixelization scheme, which allows us to handle large amounts of data as in the SDSS photometric survey. Using spectroscopic and photometric data in the redshift range 0.01&lt;=z&lt;=0.40, we obtain 5901 triplet candidates. 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