J/ApJ/805/143ivo://CDS.VizieR/J/ApJ/805/143doi:10.26093/cds/vizier.18050143CDSDawson W.A.Jee M.J.Stroe A.Ng Y.K.Golovich N.Wittman D.,Sobral D.Bruggen M.Rottgering H.J.A.van Weeren R.J.2017-09-19T14:24:16Z2015-10-20T11:09:32ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedspectroscopyvisible-astronomysloan-photometryX-ray and radio observations of CIZA J2242.8+5301 suggest that it is a major cluster merger. Despite being well studied in the X-ray and radio, little has been presented on the cluster structure and dynamics inferred from its galaxy population. We carried out a deep (i<25) broadband imaging survey of the system with Subaru SuprimeCam (g and i bands) and the Canada-France-Hawaii Telescope (r band), as well as a comprehensive spectroscopic survey of the cluster area (505 redshifts) using Keck DEep Imaging Multi-Object Spectrograph. We use these data to perform a comprehensive galaxy/redshift analysis of the system, which is the first step to a proper understanding of the geometry and dynamics of the merger, as well as using the merger to constrain self-interacting dark matter. We find that the system is dominated by two subclusters of comparable richness with a projected separation of 6.9'_-0.5_^+0.7^ (1.3_-0.10_^+0.13^Mpc). We find that the north and south subclusters have similar redshifts of z~0.188 with a relative line-of-sight (LOS) velocity difference of 69+/-190km/s. We also find that north and south subclusters have velocity dispersions of 1160_-90_^+100^ and 1080_-70_^+100^km/s, respectively. These correspond to masses of 16.1_-3.3_^+4.6^x10^14^ and 13.0_-2.5_^+4.0^x10^14^M_{Sun}_, respectively. While velocity dispersion measurements of merging clusters can be biased, we believe the bias in this system to be minor due to the large projected separation and nearly plane-of-sky merger configuration. We also find that the cDs of the north and south subclusters are very near their subcluster centers, in both projection (55 and 85kpc, respectively) and normalized LOS velocity (|{Delta}v|/{sigma}_v_=0.43+/-0.13 and 0.21+/-0.12 for the north and south, respectively). CIZA J2242.8+5301 is a relatively clean dissociative cluster merger with near 1:1 mass ratio, which makes it an ideal merger for studying merger-associated physical phenomena.2015ApJ...805..143Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/805/143CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/772/131 : Musket Ball Cluster redshift catalog (Dawson, 2013)J/A+A/555/A110 : Radio images of CIZA J2242.8+5301 (Stroe+, 2013)J/A+A/540/A123 : Galaxy clusters from SDSS DR8 (Einasto+, 2012)J/MNRAS/425/477 : Dark matter annihilation in galaxy clusters (Nezri+, 2012)J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)J/ApJ/662/224 : Second CIZA subsample (Kocevski+, 2007)http://www.mergingclustercollaboration.org/ : Merging cluster collaborationhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/805/143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/805/143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/805/143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/805/143https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/805/143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/805/143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/805/143/table1 (Keck DEIMOS redshift catalog of the CIZA J2242.8+5301 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/805/143/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/805/143/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/805/143/table1?GETtext/xml+votable180.050000true340.682162552.904810280.0055555555555555566/14225 142272.381800341673347e-19 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/805/143?format=asciiOpticaldefaultJ/ApJ/805/143/table1Keck DEIMOS redshift catalog of the CIZA J2242.8+5301 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[22] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[52/53] Degree of Declination (J2000)pos.eq.dec;meta.mainz[-0.0007/0.8] Spectroscopic redshift (1)src.redshiftdoublee_z[0/0.0003] Error in zstat.error;src.redshiftdoubleimag[15.9/23.6] i band AB magnitude in SDSS systemmagphot.mag;em.opt.Ifloate_imag[0/0.09]? Error in imagmagstat.error;phot.mag;em.opt.IfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar