J/MNRAS/492/2405ivo://CDS.VizieR/J/MNRAS/492/2405doi:10.26093/cds/vizier.74922405CDSBoschin W.Girardi M.Gastaldello F.2024-08-20T20:15:32Z2023-05-31T15:13:33ZCDS support team

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

cds-question@unistra.frgalaxy-clustersastrometryradial-velocityvisible-astronomyspectroscopysloan-photometryWe present the study of the internal dynamics of the intriguing galaxy cluster Abell 1703, a system hosting a probable giant radio halo whose dynamical status is still controversial. Our analysis is based on unpublished spectroscopic data acquired at the Italian Telescopio Nazionale Galileo and data publicly available in the literature. We also use photometric data from the Sloan Digital Sky Survey. We select 147 cluster members and compute the cluster redshift <z>~0.277 and the global line-of-sight velocity dispersion {sigma}_v_~1300km/s. We infer that Abell 1703 is a massive cluster: M_200_~1-2x10^15^M_{sun}_. The results of our study disagree with the picture of an unimodal, relaxed cluster as suggested by previous studies based on the gravitational lensing analysis and support the view of a perturbed dynamics proposed by recent works based on Chandra X-ray data. The first strong evidence of a dynamically disturbed cluster comes from the peculiarity of the BCG velocity with respect to the first moment of the velocity distribution of member galaxies. Moreover, several statistical tests employed to study the cluster galaxies kinematics find significant evidence of substructure, being Abell 1703 composed by at least two or three subclumps probably caught after the core-core passage. In this observational scenario, the suspected existence of a radio halo in the centre of this cluster is not surprising and well agrees with the theoretical models describing diffuse radio sources in clusters.2020MNRAS.492.2405Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/492/2405CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/492/2405https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/492/2405http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/492/2405https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/492/2405https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/492/2405http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/492/2405GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/492/2405/table1 (Velocity catalogue of 278 spectroscopically measured galaxies in the field of Abell 1703)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/2405/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/2405/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/2405/table1?GETtext/xml+votable180.050000true198.306916751.81336110.005555555555555556Cone search capability for table J/MNRAS/492/2405/table2 (Substructures detected by the analysis of the 2D distribution of the spectroscopic members of Abell 1703)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/2405/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/2405/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/2405/table2?GETtext/xml+votable180.050000true198.76583351.8305560.005555555555555556Cone search capability for table J/MNRAS/492/2405/table5 (Substructures detected by the 3D analysis of the spectroscopic members of Abell 1703 (3D-DEDICA method))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/2405/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/2405/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/2405/table5?GETtext/xml+votable180.050000true198.77041751.820.0055555555555555566/11063https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/492/2405?format=asciiOpticaldefaultJ/MNRAS/492/2405/table1Velocity catalogue of 278 spectroscopically measured galaxies in the field of Abell 1703recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[001/278] Galaxy identification numbermeta.id;meta.mainintf_IDFlag on ID (1)meta.codecharSource[BTL] Redshift source (2)meta.bibcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrmagDereddened SDSS r-band magnitudemagphot.mag;em.opt.RfloatRVHeliocentric radial velocity RV=cz_{Sun}_km/sspect.dopplerVeloc;pos.heliocentricinte_RVError on RVkm/sstat.errorintf_e_RV[e] Flag on e_RV (3)meta.codecharJ/MNRAS/492/2405/table2Substructures detected by the analysis of the 2D distribution of the spectroscopic members of Abell 1703chi2s{chi}^2^ value of the galaxy peakstat.fit.chi2floatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[NS] Subclump identifiermeta.id;meta.maincharNSNumber of assigned member galaxiesmeta.numberintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrhosRelative density with respect to the densest subclumpphys.density;arith.ratiofloatJ/MNRAS/492/2405/table3Substructures detected by the 3D analysis of the spectroscopic members of Abell 1703 (Htree method)sigmaRadial velocity dispersionkm/sspect.dopplerVelocinte_sigmaError on sigmakm/sstat.errorintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSubclump identifier (GNN)meta.id;meta.maincharNSNumber of assigned member galaxiesmeta.numberintRVMean radial velocitykm/sphys.veloc;pos.heliocentricinte_RVError on RVkm/sstat.errorintJ/MNRAS/492/2405/table4Substructures detected by the 3D analysis of the spectroscopic members of Abell 1703 (3D-KMM method)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSubclump identifier (KMM3DN)meta.id;meta.maincharNSNumber of assigned member galaxiesmeta.numberintRVMean radial velocitykm/sphys.veloc;pos.heliocentricinte_RVError on RVkm/sstat.errorintsigmaRadial velocity dispersionkm/sspect.dopplerVelocinte_sigmaError on sigmakm/sstat.errorintJ/MNRAS/492/2405/table5Substructures detected by the 3D analysis of the spectroscopic members of Abell 1703 (3D-DEDICA method)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSubclump identifier (DED3DN)meta.id;meta.maincharNSNumber of assigned member galaxiesmeta.numberintRVfitFitted radial velocitykm/sphys.veloc;pos.heliocentricintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrhosRelative density with respect to the densest subclumpphys.density;arith.ratiofloatchi2s{chi}^2^ value of the galaxy peakstat.fit.chi2int