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<ri:Resource created="2010-02-07T11:42:06Z" 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>Groups of Galaxies from CfA2 Redshift Survey</title><shortName>VII/256</shortName><identifier>ivo://CDS.VizieR/VII/256</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Mahtessian A.P.</name></creator><creator><name>Movsessian V.G.</name></creator><date role="Updated">2018-01-30T07:18:24Z</date><date role="Created">2010-02-07T11:42:06Z</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>galaxies</subject><subject>catalogs</subject><subject>apparent-magnitude</subject><subject>radial-velocity</subject><subject>galaxy-kinematics</subject><description>The catalog contains statistically homogeneous and physically well graunded groups of galaxies based on the CfA2 redshift survey (Cat. J/ApJS/121/287) in the area of space 1000km/s&lt;=cz&lt;=15000km/s, |bII|&gt;=20{deg}. For identification of groups we used a modification of a friends of friends (FoF) method. Principles of friendship and definition of values of presented there free parameters described in Mahtessian (1988Afz....28..255M, 1997Ap.....40..285M). There are 1971 groups with 2 or more members, for a total of 6787 members (46.3%); 765 of the groups have 3 or more members with 4375 galaxies (28.1%). The others 8790 (56.4%) galaxies make a sample of "single" galaxies. The catalog includes group numbers, numbers of members, equatorial coordinates, Virgo-centric radial velocities, line-of-sight-velocity dispersions, integrated group luminosities, and relative quantity of false members.</description><source format="bibcode">2010Ap.....53...70M</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/256</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/121/287">J/ApJS/121/287 : The CfA redshift survey (CfA2S) catalog (Huchra+, 1999)</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=VII/256</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VII/256</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VII/256</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL use="base">https://vizier.cds.unistra.fr/viz-bin/votable?-source=VII/256</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/votable?-source=VII/256</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South 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31534 31549 31550 31551 31554 31580 31592 31637 31639 31663 31666 31670 31673 31675 31676 31679 31715 31718 31720 31721 31880 31881 31882 31923 31932 31935 31998 32263 32264 32266 32272 32278 32285 32328 32336 32340 32349 32350 32370 32426 32444 32446 32447 32460 32462 32466 32468 32470 32471 32479 32481 32482 32492 32545 32548 32550 32555 32561 32573 32574 32575 32616 32618 32642 32660 32662 32713 32747 36861 36862 49148</spatial><footprint ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/VII/256?format=ascii</footprint><waveband>Optical</waveband></coverage><tableset><schema><name>default</name><table><name>VII/256/table1</name><description>Data of groups members</description><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>Group</name><description>Number of group</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Galaxy</name><description>Galaxy name, as in CfA2 (Cat. J/ApJS/121/287)</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="11*">char</dataType></column><column><name>RA1950</name><description>Right ascension (1950)</description><ucd>pos.eq.ra;meta.main</ucd></column><column><name>DE1950</name><description>Declination (1950)</description><ucd>pos.eq.dec;meta.main</ucd></column><column><name>magc</name><description>Apparent magnitude of galaxy corrected from galactic absorption (Sandage, 1973ApJ...183..711S) and by K damping (Yang et al., 2005MNRAS.356.1293Y.)</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>RVc</name><description>Virgo-centric radial velocities of galaxy (Mahtessian, 1997Ap.....40..285M)</description><unit>km/s</unit><ucd>phys.veloc;pos.lg</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>T</name><description>Morphological type of galaxy by CfA2 (99 means, that the type is unknown)</description><ucd>src.morph.type</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>RVC</name><description>Radial velocities of galaxy relative to the group centre</description><unit>km/s</unit><ucd>phys.veloc;arith.diff</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>RC</name><description>Projected distance of galaxy to group centre</description><unit>Mpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>MAG</name><description>Absolute magnitude of galaxy</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Lum</name><description>Luminosity of galaxy</description><unit>solLum</unit><ucd>phys.luminosity</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>CfA</name><description>Details from CfA Redshift Survey about this galaxy</description><ucd>meta.ref.url</ucd><dataType xsi:type="vs:VOTableType" arraysize="*">char</dataType></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table><table><name>VII/256/table2</name><description>Mean parameters of groups</description><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>Group</name><description>Group number</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>primary</flag></column><column><name>RA1950</name><description>A mean right ascension of group (1950)</description><ucd>pos.eq.ra;meta.main</ucd></column><column><name>DE1950</name><description>A mean declination of group (1950)</description><ucd>pos.eq.dec;meta.main</ucd></column><column><name>Ng</name><description>Number of visible members of group</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>VG</name><description>Mean Virgocentric velocity of group</description><unit>km/s</unit><ucd>phys.veloc;pos.lg</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>sigma</name><description>A dispersion of radial velocity of members of group</description><unit>km/s</unit><ucd>spect.dopplerVeloc</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Rmean</name><description>Mean distance of members of group from its centre</description><unit>Mpc</unit><ucd>phys.size.radius</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Rmax</name><description>Group radius: the greatest distance of members of group from its centre</description><unit>Mpc</unit><ucd>phys.size.radius</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Lobs</name><description>Total luminosity of visible members of group</description><unit>solLum</unit><ucd>phys.luminosity</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>Ltot</name><description>Total luminosity both visible, and invisible members of group</description><unit>solLum</unit><ucd>phys.luminosity</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FIC</name><description>Relative quantity of false members of groups in percentage (Mahtessian, 1998Ap.....41..308M)</description><unit>%</unit><ucd>stat.fit.goodness</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table></schema></tableset></ri:Resource>