J/MNRAS/456/2829ivo://CDS.VizieR/J/MNRAS/456/2829doi:10.26093/cds/vizier.74562829CDSGirardi M.Boschin W.Gastaldello F.Giovannini G.Govoni F.,Murgia M.Barrena R.Ettori S.Trasatti M.Vacca V.2024-08-15T20:17:28Z2016-11-16T09:27:38ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradial-velocityWe study the structure of the galaxy cluster Abell 523 (A523) at z=0.104 using new spectroscopic data for 132 galaxies acquired at the Telescopio Nazionale Galileo, new photometric data from the Isaac Newton Telescope, and X-ray and radio data from the Chandra and Very Large Array archives. We estimate the velocity dispersion of the galaxy population, {sigma}_V_=949_-60_^+80^km/s, and the X-ray temperature of the hot intracluster medium, kT=5.3+/-0.3keV. We infer that A523 is a massive system: M_200_~7-9x10^14^M_{sun}_. The analysis of the optical data confirms the presence of two subclusters, 0.75Mpc apart, tracing the SSW-NNE direction and dominated by the two brightest cluster galaxies (BCG1 and BCG2). The X-ray surface brightness is strongly elongated towards the NNE direction, and its peak is clearly offset from both the brightest cluster galaxies (BCGs). We confirm the presence of a 1.3Mpc large radio halo, elongated in the ESE-WNW direction and perpendicular to the optical/X-ray elongation. We detect a significant radio/X-ray offset and radio polarization, two features which might be the result of a magnetic field energy spread on large spatial scales. A523 is found consistent with most scaling relations followed by clusters hosting radio haloes, but quite peculiar in the P_radio_-L_X_ relation: it is underluminous in the X-rays or overluminous in radio. A523 can be described as a binary head-on merger caught after a collision along the SSW-NNE direction. However, minor optical and radio features suggest a more complex cluster structure, with A523 forming at the crossing of two filaments along the SSW-NNE and ESE-WNW directions.2016MNRAS.456.2829Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/456/2829CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/456/2829https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/456/2829http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/456/2829https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/456/2829https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/456/2829http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/456/2829GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/456/2829/table1 (Radial velocities of 132 galaxies in the field of A523)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/456/2829/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/456/2829/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/456/2829/table1?GETtext/xml+votable180.050000true74.6988758.80597220.0055555555555555566/23384https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/456/2829?format=asciidefaultJ/MNRAS/456/2829/table1Radial velocities of 132 galaxies in the field of A523recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSequential numbermeta.recordintn_ID[*AB] Note on ID (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrmag? INT dereddened r-band magnitudemagphot.mag;em.opt.RfloatnullableHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_HRVrms uncertainty on HRVkm/sstat.errorintSimbadSimbad column added by the CDSmeta.ref.urlchar