J/A+A/602/A20ivo://CDS.VizieR/J/A+A/602/A20doi:10.26093/cds/vizier.36020020CDSBiviano A.Popesso P.Dietrich J.P.Zhang Y.-Y.Erfanianfar G.,Romaniello M.Sartoris B.2019-07-04T11:27:46Z2017-05-24T08:36:02ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesvisible-astronomyredshiftedDetermination of cluster masses is a fundamental tool for cosmology. Comparing mass estimates obtained by different probes allows to understand possible systematic uncertainties. Aims. The cluster Abell 315 is an interesting test case, since it has been claimed to be underluminous in X-ray for its mass (determined via kinematics and weak lensing). We have undertaken new spectroscopic observations with the aim of improving the cluster mass estimate, using the distribution of galaxies in projected phase space. We identified cluster members in our new spectroscopic sample. We estimated the cluster mass from the projected phase-space distribution of cluster members using the MAMPOSSt method. In doing this estimate we took into account the presence of substructures that we were able to identify. We identify several cluster substructures. The main two have an overlapping spatial distribution, suggesting a (past or ongoing) collision along the line-of-sight. After accounting for the presence of substructures, the mass estimate of Abell 315 from 14 kinematics is reduced by a factor 4, down to M_200_=0.8_-0.4_^+0.6^10+14M_{sun}_. We also find evidence that the cluster mass concentration is unusually low, c_200_=r_200_/r_-2_<1. Using our new estimate of c200 we revise the weak lensing mass estimate down to M_200_=1.8_-0.9_^+1.7^10+14M_{sun}_. Our new mass estimates are in agreement with that derived from the cluster X-ray luminosity via a scaling relation, M_200_=0.9+/-0.2*10^14^M_{sun}_. Abell 315 no longer belongs to the class of X-ray underluminous clusters. Its mass estimate was inflated by the presence of an undetected subcluster in collision with the main cluster. Whether the presence of undetected line-of-sight structures can be a general explanation for all X-ray underluminous clusters remains to be explored using a statistically significant sample.2017A&A...602A..20Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A20https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/602/A20/table1 (Redshift and membership for 946 galaxies in the Abell 315 cluster field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/602/A20/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/602/A20/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/602/A20/table1?GETtext/xml+votable180.050000true31.9000417-0.98463890.0055555555555555566/17723 17726-17727 17809 17812-17813https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/602/A20?format=asciiOpticaldefaultJ/A+A/602/A20/table1Redshift and membership for 946 galaxies in the Abell 315 cluster fieldSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy identification numbermeta.id;meta.mainintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzSDSS? Heliocentric redshift from SDSSsrc.redshiftfloatnullablezVIMOS? Heliocentric redshift from VIMOSsrc.redshiftfloatnullableMember[0/1] Cluster membership flagmeta.code.errorintSubst[0/1] Cluster substructure flagmeta.codeintProbMain cluster membership probabilitystat.probability;meta.mainfloatSloanDisplay the online SDSS data for this galaxymeta.ref.urlchar