J/A+A/396/397ivo://CDS.VizieR/J/A+A/396/397doi:10.26093/cds/vizier.33960397CDSBoschin W.2006-12-04T15:40:03Z2006-12-04T16:39:46ZCDS support team

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

cds-question@unistra.frgalaxy-clustersx-ray-sourcesI present the first results of a search for clusters of galaxies in Chandra ACIS pointed observations at high galactic latitude with exposure times larger than 10ks. The survey is being carried out using the Voronoi Tessellation and Percolation technique, which is particularly suited for the detection and accurate quantification of extended and/or low surface brightness emission in X-ray imaging observations. A new catalogue of 36 cluster candidates has been created from 5.55deg^2^ of surveyed area. Five of these candidates have already been associated to visible enhancements of the projected galaxy distribution in low deepness DSS-II fields and are probably low-to moderate redshift systems. Three of the candidates have been identified in previous ROSAT-based surveys. I show that a significative fraction (30-40%) of the candidate clusters are probably intermediate to high redshift systems. In this paper I publish the catalogue of these first candidate clusters. I also derive the number counts of clusters and compare it with the results of deep ROSAT-based cluster surveys.2002A&A...396..397Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/396/397CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/396/397https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/396/397http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/396/397https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/396/397https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/396/397http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/396/397GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/396/397/table1 (The cluster catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/396/397/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/396/397/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/396/397/table1?GETtext/xml+votable180.050000true7.755526.44410.0055555555555555566/24 686 6073 7224 7226 7273 7603 7756 8043 8644 8675 9272 9640 10037 10344 10387 11806 16276 19283 19950 22607 22913 22915 24765 25934 27009 27132 31288 34139 36082 36141 48452https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/396/397?format=asciiX-raydefaultJ/A+A/396/397/table1The cluster catalogue[B2002c]Sequential numbermeta.recordintprimaryRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainFXX-ray fluxmW.m**-2phot.flux;em.X-raydoublee_FXrms uncertainty on FXmW.m**-2stat.errordoublerEstimated characteristic radiusarcsecphys.angSizefloatS/NSignal-to-noise ratiostat.snrfloatNoteNote (1)meta.notechar