J/other/Sci/292.ivo://CDS.VizieR/J/other/Sci/292.2290CDSGrindlay J.E.Heinke C.Edmonds P.D.Murray S.S.2003-11-11T19:38:15Z2003-11-11T20:38:05ZCDS support team

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

cds-question@unistra.frglobular-star-clustersx-ray-sourcesx-ray-binary-starsWe have obtained high-resolution (<~1") deep X-ray images of the globular cluster 47 Tucanae (NGC 104) with the Chandra X-ray Observatory to study the population of compact binaries in the high stellar density core. A 70-kilosecond exposure of the cluster reveals a centrally concentrated population of faint (L_X_~10^30-33^ergs/s) X-ray sources, with at least 108 located within the central 2'x2.5' and >~half with L_X_<~10^30.5^ergs/s. All 15 millisecond pulsars (MSPs) recently located precisely by radio observations are identified, though 2 are unresolved by Chandra. The X-ray spectral and temporal characteristics, as well as initial optical identifications with the Hubble Space Telescope, suggest that >~50 percent are MSPs, about 30 percent are accreting white dwarfs, about 15 percent are main-sequence binaries in flare outbursts, and only two to three are quiescent low-mass X-ray binaries containing neutron stars, the conventional progenitors of MSPs. An upper limit of about 470 times the mass of the sun is derived for the mass of an accreting central black hole in the cluster. These observations provide the first X-ray ``color-magnitude'' diagram for a globular cluster and census of its compact object and binary population. Observations were made on UT 16.31 - 17.22 March, 2000.2001Sci...292.2290Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/Sci/292.2290CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/Sci/292.2290https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/Sci/292.2290http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/Sci/292.2290https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/Sci/292.2290https://vizier.iucaa.in/viz-bin/votable?-source=J/other/Sci/292.2290http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/Sci/292.2290GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/Sci/292.2290/table1 (47 Tuc X-Ray Source Parameters (MS 61135))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/Sci/292.2290/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/Sci/292.2290/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/Sci/292.2290/table1?GETtext/xml+votable180.050000true6.07070417-72.074216670.005555555555555556Chandra6/33321https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/Sci/292.2290?format=asciiX-raydefaultJ/other/Sci/292.2290/table147 Tuc X-Ray Source Parameters (MS 61135)DEJ2000Declination (J2000)pos.eq.dec;meta.maine_DEs? rms uncertainty on DE (1)arcsecstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[GHE2001]Chandra source number (WNNN)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.maine_RAs? rms uncertainty on RA (1)sstat.errorfloatnullableMedctsCounts in 0.5-4.5 keV band (2)ctphot.count;em.X-rayfloatSfctsCounts in 0.5-1.5 keV band (2)ctphot.count;em.X-rayfloatHdctsCounts in 1.5-6 keV band (2)ctphot.count;em.X-rayfloatSf/HdSoftness ratio, defined as Sfcts/Hdctsphot.flux;arith.ratiofloatLXIntrinsic luminosities in ROSAT (0.5-2.5keV) band (3)1e-07Wphys.luminosity;em.X-raydoubleIDIdentification (4)src.classchar