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<ri:Resource created="2016-08-22T14:35:23Z" status="active" updated="2026-03-17T20:07:36Z" 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 UGC isolated galaxy pair catalog</title><shortName>J/other/AstBu/71</shortName><identifier>ivo://CDS.VizieR/J/other/AstBu/71.270</identifier><altIdentifier>doi:10.26093/cds/vizier/dv/hbkcha</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Chamaraux P.</name></creator><creator><name>Nottale L.</name></creator><date role="Updated">2026-03-17T20:07:36Z</date><date role="Created">2016-08-22T14:35:23Z</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>galaxy-clusters</subject><subject>radial-velocity</subject><description>The present paper is devoted to the construction of a catalog of isolated galaxy pairs from the Uppsala Galaxy Catalog (UGC), using accurate radial velocities. The UGC lists 12 921 galaxies to {delta}&gt;-2:30 and is complete to an apparent diameter of 1{arcmin}. The criteria used to define the isolated galaxy pairs are based on velocity, interdistance, reciprocity and isolation information. A peculiar investigation has allowed to gather very accurate radial velocities for pair members, from high quality HI and optical measurements (median uncertainty on velocity differences 10km/s). Our final catalog contains 1005 galaxy pairs with {rho}&gt;2.5, of which 509 have {rho}&gt;5 (50% of the pairs, i.e. 8% of the UGC galaxies) and 273 are highly isolated with {rho}&gt;10 (27% of the pairs, i.e. 4% of the UGC galaxies). Some global properties of the pair catalog are given.</description><source format="bibcode">2016AstBu..71..270C</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/AstBu/71.270</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/26">VII/26 : Uppsala General Catalogue of Galaxies (UGC) (Nilson 1973)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL 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ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/AstBu/71.270?format=ascii</footprint><waveband>Optical</waveband></coverage><tableset><schema><name>default</name><table><name>J/other/AstBu/71.270/table1</name><description>The UGC isolated galaxy pair catalog</description><column><name>SimbadName</name><description>Simbad column added by the CDS</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="20*">char</dataType></column><column><name>UGC1</name><description>UGC number of the first pair member</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>UGC2</name><description>UGC number of the second pair member</description><ucd>meta.id.assoc</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>RV1</name><description>[-82/16463] Radial velocity relative to the Sun of the first member</description><unit>km/s</unit><ucd>spect.dopplerVeloc</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_RV1</name><description>[1/94] Uncertainty of RV1</description><unit>km/s</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>RV2</name><description>[-207/16279] Radial velocity relative to the Sun of the second member</description><unit>km/s</unit><ucd>spect.dopplerVeloc</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_RV2</name><description>[1/122] Uncertainty of RV2</description><unit>km/s</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>dRV</name><description>[0/593] Absolute value of the radial velocity difference between the pair members</description><unit>km/s</unit><ucd>phys.veloc;arith.diff</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_dRV</name><description>[1.4/132.9] Uncertainty of dRV</description><unit>km/s</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Sep</name><description>[0.002/0.991] Projected distance on the sky between two pair members</description><unit>Mpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>rho</name><description>2.5/10.] Ratio between the projected distance of the nearest UGC galaxy to the center of the pair and Sep (1)</description><ucd>phys.size;arith.ratio</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>_RA</name><description>Position of the first galaxy, UCG1 (right ascension part)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd></column><column><name>_DE</name><description>Position of the first galaxy, UCG1 (declination part)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd></column></table></schema></tableset></ri:Resource>