J/ApJ/876/59ivo://CDS.VizieR/J/ApJ/876/59doi:10.26093/cds/vizier.18760059CDSCheng Z.Li Z.Li X.Xu X.Fang T.2021-09-09T09:43:26Z2020-12-02T09:55:52ZCDS support team

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

cds-question@unistra.frglobular-star-clustersx-ray-sourcesUsing archival Chandra observations with a total exposure of 510ks, we present an updated catalog of point sources for globular cluster (GC) 47 Tucanae. Our study covers an area of ~176.7'^2^ (i.e., with R<~7.5') with 537 X-ray sources. We show that the surface density distribution of X-ray sources in 47 Tuc is highly peaked in the cluster center, rapidly decreases at intermediate radii, and finally rises again at larger radii, with two distribution dips at R~100" and R~170" for the faint (L_X_>~5.0x10^30^erg/s) and bright (L_X_<~5.0x10^30^erg/s) groups of X-ray sources, respectively. These distribution features are similar to those of blue straggler stars (BSSs), where the distribution dip is located at R~200". By fitting the radial distribution of each group of sources with a "generalized King model", we estimated an average mass of 1.51+/-0.17M_{sun}_, 1.44+/-0.15M_{sun}_ and 1.16+/-0.06M_{sun}_ for the BSSs, bright X-ray sources, and faint X-ray sources, respectively. These results are consistent with the mass segregation effect of heavy objects in GCs, where more massive objects drop to the cluster center faster and their distribution dip propagates outward further. Besides, the peculiar distribution profiles of X-ray sources and BSSs are also consistent with the mass segregation model of binaries in GCs, which suggests that, in addition to the dynamical formation channel, primordial binaries are also a significant contributor to the X-ray source population in GCs.2019ApJ...876...59Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/876/59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)V/150 : Updated cat. of variable stars in globular clusters (Clement+ 2017)J/A+AS/113/299 : Abundances & vel. for cluster giants (Minniti 1995)J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)J/A+A/324/915 : Blue stragglers in M3 (Ferraro+ 1997)J/ApJ/559/1060 : Variables in 47 Tuc (Albrow+, 2001)J/other/Sci/292.2290 : Chandra compact binaries in 47 Tuc (Grindlay+, 2001)J/A+A/391/945 : HST phot. of 74 gal. globular clusters (Piotto+, 2002)J/ApJ/632/894 : Blue stragglers, HB & turnoff stars (De Marco+, 2005)J/ApJ/625/796 : X-ray sources in the 47 Tuc GCs (Heinke+, 2005)J/ApJS/166/249 : Stellar dynamics and PMs in 47Tuc (McLaughlin+, 2006)J/AJ/132/447 : Surface Brightness of 38 Gal. GCs (Noyola+, 2006)J/AJ/134/1298 : CaII EWs in 29 Galactic clusters (Carrera+, 2007)J/A+A/483/183 : Catalogue of Blue Stragglers (Moretti+, 2008)J/A+A/524/A44 : CN & CH line strengths in 12 globulars (Pancino+, 2010)J/ApJS/193/23 : Stellar parameters in 47 Tucanae (McDonald+, 2011)J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)J/ApJ/766/136 : Stellar encounter rates in Gal. GCs (Bahramian+, 2013)J/MNRAS/434/358 : 4 Gal. globular clusters Fe line depths (Sakari+, 2013)J/MNRAS/434/1681 : Extremely metal-poor stars CaII triplet (Carrera+, 2013)J/MNRAS/443/2492 : {Delta}a obs. of 3 globular clusters (Paunzen+, 2014)J/ApJ/827/12 : HSTPROMO. IV. Blue stragglers (Baldwin+, 2016)J/A+A/588/A128 : Variables in globular clusters (Figuera Jaimes+, 2016)J/A+A/601/A96 : Spectroscopy of globular clusters (Larsen+, 2017)J/A+A/601/A112 : GES iDR4 Mg-Al anticorrelation in GCs (Pancino+, 2017)J/MNRAS/472/3706 : 47 Tuc GCs Chandra studies (Bhattacharya+, 2017)J/ApJS/228/2 : CDF-South survey: 7Ms sources (Luo+, 2017)J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Coll.+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/876/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/876/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/876/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/876/59https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/876/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/876/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/876/59/table2 (Main Chandra source catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/876/59/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/876/59/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/876/59/table2?GETtext/xml+votable180.050000true5.66617-72.0618350.005555555555555556Cone search capability for table J/ApJ/876/59/table1 (Log of Chandra observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/876/59/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/876/59/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/876/59/table1?GETtext/xml+votable180.050000true5.97704-72.072970.0055555555555555566/33321https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/876/59?format=asciiX-raydefaultJ/ApJ/876/59/table2Main Chandra source catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/537] X-ray catalog sequence numbermeta.id;meta.mainintNameIAU designation (HHMMSS.ss+DDMMSS.s; J2000)meta.idcharRAJ2000[5.66/6.41] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.21/-71.9] Declination (J2000)degpos.eq.dec;meta.mainePos[0/0.8] 1{sigma} positional uncertaintyarcsecstat.error;posfloatRp[0.3/448] Projected distance from cluster center (1)arcsecpos.distancefloatPBBinomial no-source probabilitystat.fit.goodnesscharNetCts-t[4.6/42882] Full (0.5-8keV) band aperture-corrected source countsctphot.count;em.X-rayfloate_NetCts-t[1.6/42675] 1{sigma} lower bound of NetCts-tctstat.errorfloatE_NetCts-t[7.5/43092] 1{sigma} upper bound of NetCts-tctstat.error;stat.maxfloatNetCts-s[0.3/40761] Soft (0.5-2keV) band aperture-corrected source countsctphot.count;em.X-rayfloate_NetCts-s[0/40559] 1{sigma} lower bound of NetCts-sctstat.errorfloatE_NetCts-s[1.9/40965] 1{sigma} upper bound of NetCts-sctstat.error;stat.maxfloatNetCts-h[-4/8599] Hard (2-8 keV) band aperture-corrected source countsctphot.count;em.X-rayfloate_NetCts-h[0/8506]? 1{sigma} lower bound of NetCts-hctstat.errorfloatnullableE_NetCts-h[1/8693] 1{sigma} upper bound of NetCts-hctstat.error;stat.maxfloatF0.5-8[4.2e-8/0.00032] Full (0.5-8keV) band photon fluxph.cm**-2.s**-1phot.flux;em.X-raydoubleF0.5-2[2.1e-9/0.0002] Soft (0.5-2keV) band photon fluxph.cm**-2.s**-1phot.flux;em.X-raydoubleF2-8[-7.3e-8/7.4e-5] Hard (2-8keV) band photon fluxph.cm**-2.s**-1phot.flux;em.X-raydoubleL0.5-8[2.4e+29/1.8e+33] Absorption-corrected intrinsic 0.5-8.0keV luminosity in erg/s (2)1e-07Wphys.luminosity;em.X-raydoubleL0.5-2[7.3e+28/5.4e+32] Absorption-corrected intrinsic 0.5-2.0keV luminosity in erg/s (2)1e-07Wphys.luminosity;em.X-raydoubleL2-8[7.9e+28/1.3e+33] Absorption-corrected intrinsic 2.0-8.0keV luminosity in erg/s (2)1e-07Wphys.luminosity;em.X-raydoubleJ/ApJ/876/59/table1Log of Chandra observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsID[78/17420] Chandra observation identifiermeta.id;obs.param;obsintDateDate of observation (UT)time.epochnullableArraysInstrument layout for 47 Tucinstr.setupcharTimeL[0.85/68.77] Live timekstime.duration;obs.exposurefloatRAJ2000[5.9/6.1] Telescope optical pointing right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.1/-72] Telescope optical pointing declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRollRoll angledeginstr.offsetfloatTimeF[0.4/3.3] Frame time of each observationstime.expofloatdelX[-1.2/0.3] Right ascension shiftpixpos.eq.ra;arith.difffloatdelY[-0.7/1.2] Declination shiftpixpos.eq.dec;arith.difffloatRot[-0.1/0.3] Rotation angledeginstr.offsetfloatScale[0.99/1.01] Scale factor of the wcs_match transformation matrixarith.factorfloat