J/AJ/137/4795ivo://CDS.VizieR/J/AJ/137/4795doi:10.26093/cds/vizier.51374795CDSCoziol R.Andernach H.Caretta C.A.Alamo Martinez K.A.Tago E.2017-12-15T10:54:55Z2011-11-16T15:47:48ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxy-clustersgalaxy-kinematicsA large sample of Abell clusters of galaxies, selected for the likely presence of a dominant galaxy, is used to study the dynamical properties of the brightest cluster members (BCMs). From visual inspection of Digitized Sky Survey images combined with redshift information we identify 1426 candidate BCMs located in 1221 different redshift components associated with 1169 different Abell clusters. This is the largest sample published so far of such galaxies. From our own morphological classification we find that ~92% of the BCMs in our sample are early-type galaxies and 48% are of cD type. We confirm what was previously observed based on much smaller samples, namely, that a large fraction of BCMs have significant peculiar velocities. From a subsample of 452 clusters having at least 10 measured radial velocities, we estimate a median BCM peculiar velocity of 32% of their host clusters' radial velocity dispersion. This suggests that most BCMs are not at rest in the potential well of their clusters. This phenomenon is common to galaxy clusters in our sample, and not a special trait of clusters hosting cD galaxies. We show that the peculiar velocity of the BCM is independent of cluster richness and only slightly dependent on the Bautz-Morgan type. We also find a weak trend for the peculiar velocity to rise with the cluster velocity dispersion. The strongest dependence is with the morphological type of the BCM: cD galaxies tend to have lower relative peculiar velocities than elliptical galaxies. This result points to a connection between the formation of the BCMs and that of their clusters. Our data are qualitatively consistent with the merging-groups scenario, where BCMs in clusters formed first in smaller subsystems comparable to compact groups of galaxies. In this scenario, clusters would have formed recently from the mergers of many such groups and would still be in a dynamically unrelaxed state.2009AJ....137.4795Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/137/4795CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/137/4795https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/137/4795http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/137/4795https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/137/4795https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/137/4795http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/137/4795GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/137/4795/table1 (Identification and Properties of the BCMs (brightest cluster members) and their host cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/137/4795/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/137/4795/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/137/4795/table1?GETtext/xml+votable180.050000true2.0702917-19.66155560.005555555555555556Cone search capability for table J/AJ/137/4795/table2 (Identification of discarded BCMs (brightest cluster members) and the clusters on which they are projected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/137/4795/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/137/4795/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/137/4795/table2?GETtext/xml+votable180.050000true1.9606667-19.70744440.005555555555555556Cone search capability for table J/AJ/137/4795/table3 (List of Discarded Clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/137/4795/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/137/4795/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/137/4795/table3?GETtext/xml+votable180.050000true32.95417-12.098330.0055555555555555565/6158 8509 8638 8882 9091 6/14 136 206 207 452 674 690 1006 2620 3953 4317 4338 4339 4438 4474 4665 4990 5005 5017 5092 5387 5536 5585 5603 5606 5679 5701 5894 6011 6022 6029 6031 6071 6076 6337 6421 6609 6615 7361 7513 7517 7550 7551 7564 8199 8220 8264 8268 8271 8648 8788 8797 8832 8919 8955 8963 8995 9040 9047 9048 9051 9073 9101 9116 9170 9250 9317 9366 9468 9476 9506 9727 9776 10151 10210 10271 10312 10318 10327 10406 10483 10549 10632 10634 10723 10822 10823 10828 11002 11003 11126 11253 11442 11443 11537 11583 11638 11727 11786 11809 11816 11846 11987 12006 12056 12118 12253 12560 13402 15112 15344 16390 16397 16399 16409 16410 16411 16412 16425 16434 16447 16454 16458 16471 16477 16482 16488 16490 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47528 47533 47541 47555 47556 47573 47583 47602 47611 47686 47872 47873 47910 47943 47948 48128 48133 48134 48135 48138 48139 48143 48160 48199 48222 48250 48258 48261 48263 48266 48275 48281 48284 48311 48315 48319 48320 48321 48325 48364 48375 48431 48439 48440 48447 48456 48459 48461 48483 48486 48492 48493 48501 48514 48517 48519 48525 48536 48576 48577 48613 48615 48640 48660 48662 48717 48735 48738 48966https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/137/4795?format=asciiOpticaldefaultJ/AJ/137/4795/table1Identification and Properties of the BCMs (brightest cluster members) and their host clusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBCM-IDGalaxy identification by rank (1)meta.id;meta.maincharAllList all BCMs (found and discarded) in this clustermeta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRAbell richness classsrc.class.richnessintBMBautz-Morgan type of Abell cluster (2)meta.note;src.class.structcharRSRood-Sastry type or ACO1989 note (2)src.class.structcharVclHeliocentric cluster mean velocitykm/sspect.dopplerVeloc;stat.meanintf_Vcl[en*:] Note on Vcl origin or problems (G1)meta.codecharl_NzLimit flag on Nzmeta.code.errorcharNz? Number of galaxies used to determine redshiftmeta.numberintnullablesigV? Cluster velocity dispersion (4)km/sphys.veloc.dispersionintnullableVBCM? Heliocentric velocity of brightest cluster memberkm/sphys.veloc;pos.heliocentricintnullablef_VBCM[*?:] Note on VBCM origin or problems (G2)meta.codecharVpec? Peculiar velocity of galaxy (5)km/sphys.veloc;src.class.starGalaxyintnullableRatio? Ratio Vpec/sigV (6)meta.notefloatnullableMorphOptical morphological type of the galaxysrc.morph.typechar2MASXThe 2MASX identification of the galaxymeta.id;src.class.starGalaxycharONameOther identification of the galaxymeta.id;src.class.starGalaxycharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/137/4795/table2Identification of discarded BCMs (brightest cluster members) and the clusters on which they are projectedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAbellAbell identification numbermeta.id;meta.maincharAllList all BCMs (found and discarded) in this clustermeta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVclHeliocentric cluster mean velocity (1)km/sspect.dopplerVeloc;stat.meanintf_VclNote on Vcl origin or problems (G1)meta.codecharVBCM? Heliocentric velocity of discarded objectkm/sphys.veloc;pos.heliocentricintnullablef_VBCMNote on VBCM origin or problems (G2)meta.codecharONameOther identification(s) of the discarded objectmeta.idcharSimbadNameSimbad column added by the CDSmeta.idcharNEDSimbad column added by the CDSmeta.refcharJ/AJ/137/4795/table3List of Discarded ClustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAbellAbell identification numbermeta.id;meta.maincharReasonReason for discarding the clustermeta.notecharSimbadNameSimbad column added by the CDSmeta.idcharNEDSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main