J/MNRAS/480/1187ivo://CDS.VizieR/J/MNRAS/480/1187doi:10.26093/cds/vizier.74801187CDSBoschin W.Girardi M.2024-08-18T20:20:58Z2022-05-17T14:02:42ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesspectroscopyWe present the study of the dynamical status of the galaxy cluster CL1821+643, a rare and intriguing cool-core cluster hosting a giant radio halo. We base our analysis on new spectroscopic data for 129 galaxies acquired at the Italian Telescopio Nazionale Galileo. We also use spectroscopic data available from the literature and photometric data from the Sloan Digital Sky Survey. We select 120 cluster member galaxies and compute the cluster redshift <z>~0.296 and the global line-of-sight velocity dispersion {sigma}_V_~1100km/s. The results of our analysis are consistent with CL1821+643 being a massive (M>10^15^M_{sun}) dynamically relaxed cluster dominated by a big and luminous elliptical at the centre of the cluster potential well. None of the tests employed to study the cluster galaxies kinematics in the 1D (velocity information), 2D (spatial information), and 3D (combined velocity and spatial information) domains is able to detect significant substructures. While this picture is in agreement with previous results based on X-ray data and on the existence of the central cool core, we do not find any evidence of a merging process responsible for the radio halo discovered in this cluster. Thus, this radio halo remains an open problem that raises doubts about our understanding of diffuse radio sources in clusters.2018MNRAS.480.1187Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/480/1187CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/480/1187https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/480/1187http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/480/1187https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/480/1187https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/480/1187http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/480/1187GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/480/1187/table1 (Radial velocities of 187 galaxies in the field of CL1821)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/1187/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/1187/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/1187/table1?GETtext/xml+votable180.050000true275.13162564.34002780.005555555555555556Cone search capability for table J/MNRAS/480/1187/table2 (The 2D structure of CL1821. Results from the spectroscopic according to the 2D-DEDICA method)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/1187/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/1187/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/1187/table2?GETtext/xml+votable180.050000true275.48791764.3402780.005555555555555556Cone search capability for table J/MNRAS/480/1187/table3 (The 2D structure of CL1821. Results from the photometric likely members according to the 2D-DEDICA method)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/1187/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/1187/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/1187/table3?GETtext/xml+votable180.050000true275.4762564.340.0055555555555555566/15351 15357https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/480/1187?format=asciidefaultJ/MNRAS/480/1187/table1Radial velocities of 187 galaxies in the field of CL1821SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number of each galaxy (1)meta.id;meta.mainintf_IDFlag on ID (2)meta.codecharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrmagr-band magnitude from the Sloan Digital Sky Survey (SDSS) DR13phot.mag;em.opt.Rfloatf_HRVFlag on HRV (3)meta.codecharHRVHeliocentric radial velocitieskm/sspect.dopplerVeloc;pos.heliocentricinte_HRVHRV errorkm/sstat.errorintJ/MNRAS/480/1187/table2The 2D structure of CL1821. Results from the spectroscopic according to the 2D-DEDICA methodrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSubclumpSubclumps of CL1821 (1)meta.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 highest peakphys.energy.densityfloatchi2SReduced chi-square of the peakmeta.notefloatJ/MNRAS/480/1187/table3The 2D structure of CL1821. Results from the photometric likely members according to the 2D-DEDICA methodrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSubclumpSubclumps of CL1821 (1)meta.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 highest peakphys.energy.densityfloatchi2SReduced chi-square of the peakmeta.notefloat