J/other/OJAP/9.6ivo://CDS.VizieR/J/other/OJAP/9.63212CDSHopp C.Wittman D.Stancioli R.Gao Z.Bouhrik F.Adler S.2026-08-08T16:18:52Z2026-08-08T17:17:38ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedspectroscopyx-ray-sourcesMerging galaxy clusters offer a unique probe of dark matter (DM) interactions through the spatial offsets between galaxies, the intracluster medium, and the DM halo. Systems that are binary, near the plane of the sky, and observed shortly after first pericenter provide the cleanest constraints on the DM self-interaction cross-section. The X-SORTER program aims to systematically identify such mergers using optical indicators of binarity in the redMaPPer cluster catalog and to follow up promising candidates with X-ray and spectroscopic observations. We select massive clusters where the top redMaPPer brightest cluster galaxy (BCG) probability is below 0.98, the top two BCGs are separated by at least 0.95 arcmin, and the optical richness exceeds lambda=120. We present XMM and Keck/DEIMOS observations of twelve clusters with no previous XMM-Newton or Chandra archival data meeting these criteria. The X-ray data reveal that most targets are morphologically disturbed, with several clear post-pericenter, dissociative systems exhibiting X-ray peaks between the BCGs. Spectroscopy confirms cluster membership and rules out foreground or background contamination.2026OJAp....963212Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/OJAP/9.63212CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttps://github.com/chrishopp12/xmm-esas-pipeline : XMM/ESAS reduction codehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/OJAP/9.63212https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/OJAP/9.63212http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/OJAP/9.63212https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/OJAP/9.63212https://vizier.iucaa.in/viz-bin/votable?-source=J/other/OJAP/9.63212http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/OJAP/9.63212GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/OJAP/9.63212/table6 (RedMaPPer properties of the 12 X-SORTER clusters studied in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/OJAP/9.63212/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/other/OJAP/9.63212/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/OJAP/9.63212/table6?GETtext/xml+votable180.050000true0.932510.0232780.005555555555555556Cone search capability for table J/other/OJAP/9.63212/table (Keck/DEIMOS spectroscopic redshifts of 1561 galaxies in the fields of the 12 X-SORTER cluster merger candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/OJAP/9.63212/table?https://vizier.iucaa.in/viz-bin/conesearch/J/other/OJAP/9.63212/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/OJAP/9.63212/table?GETtext/xml+votable180.050000true0.8542259.982806110.0055555555555555566/2230 6444 6446 6474 10780-10781 10998 11109 17857 17860 19562-19563 20392 27370-27371 27612 31707https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/OJAP/9.63212?format=asciiX-raydefaultJ/other/OJAP/9.63212/table6RedMaPPer properties of the 12 X-SORTER clusters studied in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterRedMaPPer cluster name (RM JHHMMSS.s+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloate_zrms uncertainty on zstat.error;src.redshiftfloatlambdaRichnesssrc.class.richnessinte_lambdarms uncertainty on lambdastat.errorintNzNumber of redshifts in table.datmeta.numberintANamesAlternative namesmeta.idcharJ/other/OJAP/9.63212/tableKeck/DEIMOS spectroscopic redshifts of 1561 galaxies in the fields of the 12 X-SORTER cluster merger candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterRedMaPPer identifier of the cluster field in which the galaxy was observed (RM JHHMMSS.s+DDMMSS.s)meta.id;meta.maincharRA_ICRSRight ascension (ICRS) of the galaxydegpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) of the galaxydegpos.eq.dec;meta.mainzHeliocentric spectroscopic redshiftsrc.redshiftdoublee_zrms uncertainty on zstat.error;src.redshiftdouble