J/A+A/461/397ivo://CDS.VizieR/J/A+A/461/397doi:10.26093/cds/vizier.34610397CDSPopesso P.Biviano A.Boehringer H.Romaniello M.2017-10-09T13:34:13Z2007-10-26T21:20:21ZCDS support team

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

cds-question@unistra.frgalaxy-clustersx-ray-sourcesredshiftedgalaxy-kinematicsIn this paper we consider a large sample of optically selected clusters, in order to elucidate the physical reasons for the existence of X-ray underluminous clusters. For this purpose we analyzed the correlations of the X-ray and optical properties of a sample of 137 spectroscopically confirmed Abell clusters in the SDSS database. We searched for the X-ray counterpart of each cluster in the ROSAT All Sky Survey. We find that 40% of our clusters have a marginal X-ray detection or remain undetected in X-rays. These clusters appear too X-ray faint on average for their mass as determined by velocity dispersion; i.e. they do not follow the scaling relation between X-ray luminosity and virial mass traced by the other clusters. On the other hand, they do follow the general scaling relation between optical luminosity and virial mass. We refer to these clusters as the X-ray-underluminous Abell clusters (AXU clusters, for short) and designate as "normal" the X-ray detected Abell systems. We separately examined the distributions and properties of the galaxy populations of the normal and the AXU clusters.2007A&A...461..397Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/461/397CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org/ : SDSS Home PageIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)II/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005)J/A+A/420/61 : RASS/SDSS X-ray clusters of galaxies (Schuecker+, 2004)J/A+A/423/449 : RASS-SDSS Galaxy Clusters Survey. I. (Popesso+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/461/397https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/461/397http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/461/397https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/461/397https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/461/397http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/461/397GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/461/397/tablea1 (List the properties of the 137 spectroscopically confirmed Abell systems extracted from the SDSS DR3, used in this paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/461/397/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/461/397/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/461/397/tablea1?GETtext/xml+votable180.050000true13.96250.63666670.0055555555555555566/5622 5625 5919 5964 6070-6071 6088 6127 6428 6436-6437 6485 6515 6522 6535 6603 6609 6611 6641 7205 7229 7263 7303 7361 7372 7456 7480 7484 7513 7516-7517 9506-9507 9613 9640 9813 9877 9983 11003 11006 11229 11240-11241 11251 11257 11447 11591 11805 11809 11818 11846 11907 11912 11932 11936 11940 11943 17300 17507 17556 17571-17572 17812 18009 18020 18028 18176 18410 18412 18585 18607 18625 18840 19094 19137 19427 19700 19983 19993 20005 23208 25583 25595 25852 25919 25935 26042-26043 26167 26185 26200 26208 26262 26271 26313 26315 26324 26432 26951 26962-26965 26987 27052 27054 27060 27064 27070 27074 27081-27083 27214 27238 27244 27248 27285 27334 27337 27398 27420 27660 27671-27672 27685 27777 31290 31395 31398 31401 31458 32503 36725 36780https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/461/397?format=asciiX-rayOpticaldefaultJ/A+A/461/397/tablea1List the properties of the 137 spectroscopically confirmed Abell systems extracted from the SDSS DR3, used in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintACOName of the Abell clustermeta.id;meta.mainintNmembNumber of cluster members within 1 Abell radiusmeta.numberintzcCluster mean redshiftsrc.redshiftfloatsigmacCluster velocity dispersionkm/sphys.veloc.dispersioninte_sigmacrms uncertainty on sigmackm/sstat.errorintM200Cluster mass within r_200_1e+14solMassphys.massfloatM200r? Cluster mass within r200 calculated using only the cluster red members1e+14solMassphys.massfloatnullablee_M200Fractional error on M200 and M200,red1e+14solMassstat.errorfloatr200Cluster virial radiusMpcphys.size.radiusfloatLoptCluster optical luminosity1e+12solLumphys.luminosity;em.optfloate_Loptrms uncertainty on Lopt1e+12solLumstat.errorfloatLXCluster X-ray luminosity in the ROSAT energy band (0.1-2.4keV)1e+41W.m**-2phys.luminosity;em.X-rayfloate_LXFractional error on the X-ray luminosity1e+41W.m**-2stat.errorfloatPDSDressler & Shectman (1988AJ.....95..985D) probability that a cluster does not contain substructures (1)stat.probabilityfloatXcl[0/2] X-ray class (2)meta.code.classintSimbadSimbad column added by the CDScharNEDSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main