J/MNRAS/450/630ivo://CDS.VizieR/J/MNRAS/450/630doi:10.26093/cds/vizier.74500630CDSSobral D.Stroe A.Dawson W.A.Wittman D.Jee M.J.Rottgering H.,Van Weeren R.J.Bruggen M.2024-08-14T20:22:07Z2016-01-29T16:32:57ZCDS support team

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

cds-question@unistra.frgalaxy-clustersCluster mergers may play a fundamental role in the formation and evolution of cluster galaxies. Stroe et al. (2015MNRAS.450..646S) revealed unexpected overdensities of candidate H{alpha} emitters near the ~1-Mpc-wide shock fronts of the massive (~2x10^15^M_{sun}_) 'Sausage' merging cluster, CIZA J2242.8+5301. We used the Keck/Deep Imaging Multi-Object Spectrograph and the William Herschel Telescope/AutoFib2+WYFFOS to confirm 83 H{alpha} emitters in and around the merging cluster. We find that cluster star-forming galaxies in the hottest X-ray gas and/or in the cluster subcores (away from the shock fronts) show high [SII]6716/[SII]6761 and high [SII] 716/H{alpha}, implying very low electron densities (<30xlower than all other star-forming galaxies outside the cluster) and/or significant contribution from supernovae, respectively. All cluster star-forming galaxies near the cluster centre show evidence of significant outflows (blueshifted Na D ~ 200-300km/s), likely driven by supernovae. Strong outflows are also found for the cluster H{alpha} active galactic nucleus (AGN). H{alpha} star-forming galaxies in the merging cluster follow the z~0 mass-metallicity relation, showing systematically higher metallicity (~0.15-0.2dex) than H{alpha} emitters outside the cluster (projected R>2.5Mpc). This suggests that the shock front may have triggered remaining metal-rich gas which galaxies were able to retain into forming stars. Our observations show that the merger of impressively massive (~10^15^M_{sun}_) clusters can provide the conditions for significant star formation and AGN activity, but, as we witness strong feedback by star-forming galaxies and AGN (and given how massive the merging cluster is), such sources will likely quench in a few 100Myr.2015MNRAS.450..630Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/630CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/805/143 : MC2: redshift analysis of CIZA J2242.8+5301 (Dawson+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/450/630https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/450/630http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/450/630https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/450/630https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/450/630http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/450/630GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/450/630/table1 (H{alpha} emitters in our spectroscopic sample with significant detections of at least two emission lines)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/630/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/630/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/630/table1?GETtext/xml+votable180.050000true340.539916752.92381940.0055555555555555566/14225-14227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/450/630?format=asciidefaultJ/MNRAS/450/630/table1H{alpha} emitters in our spectroscopic sample with significant detections of at least two emission linesAGN[-1/2]? AGN flag (2)meta.codeintnullablee_[SII]/Ha? rms uncertainty on [SII]/Hastat.errorfloatnullablelogMass? Stellar masslog(solMass)phys.massdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSSD[1/89] SSSD sequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzSpectroscopic redshiftsrc.redshiftdoubleimag? i magnitude (AB, in 5" aperture )magphot.mag;em.opt.Idoublenullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IdoublenullablelogFHa? H{alpha} fluxlog(mW.m**-2)phot.flux;em.line.HalphadoublenullableFWHMHa? H{alpha} FWHMkm/sspect.line.widthdoublenullableFWHMnl? Median FWHM of narrow-lineskm/sspect.line.widthdoublenullable[NII]/Ha? [NII]5007/H{alpha} abundance ratiophys.abund;arith.ratiodoublenullablee_[NII]/Ha? rms uncertainty on [NII]/Hastat.errorfloatnullable[SII]/[SII]? [SII]6716/[SII]6761 abundance ratiophot.flux;arith.ratiodoublenullablee_[SII]/[SII]? rms uncertainty on [SII]/[SII]stat.errorfloatnullable[OIII]/Hb? [OIII]5007/H{beta} abundance ratiophys.abund;arith.ratiodoublenullablee_[OIII]/Hb? rms uncertainty on [OIII]/Hbstat.errorfloatnullable[SII]/Ha? [SII]/H{alpha} abundance ratiophys.abund;arith.ratiodoublenullablee_logMass? rms uncertainty on Masslog(solMass)stat.error;phys.massfloatnullableCdist? Distance from cluster centre code (1)Mpcmeta.codefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar