J/ApJ/710/1032ivo://CDS.VizieR/J/ApJ/710/1032doi:10.26093/cds/vizier.17101032CDSAnderson J.van der Marel R.P.2017-06-01T08:52:21Z2012-04-17T12:23:32ZCDS support team

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

cds-question@unistra.frglobular-star-clustershst-photometryinfrared-photometryvisible-astronomybroad-band-photometryproper-motionsWe analyze data from the Hubble Space Telescope's (HST) Advanced Camera for Surveys of the globular cluster (GC) Omega Cen. We construct a photometric catalog of 1.2x10^6^ stars over a 10'x10' central field down to below B_F435W_=25 (M~0.35M_{sun}_). The 2.5 to 4 year baseline between observations yields a catalog of some 10^5^ proper motions over a smaller area, with 53382 "high-quality" measurements in a central R<~2' field. Artificial-star tests characterize the photometric incompleteness. We determine the cluster center to ~1" accuracy from star counts using two different methods, one based on isodensity contours and the other on "pie slices." We independently confirm the result by determining also the kinematical center of the HST proper motions, as well as the center of unresolved light seen in Two Micron All Sky Survey data. All results agree to within their 1"-2" levels of uncertainty. The proper-motion dispersion of the cluster increases gradually inward, but there is no variation in kinematics with position within the central ~15": there is no dispersion cusp and no stars with unusually high velocities. We measure for the first time in any GC the variation in internal kinematics along the main sequence.2010ApJ...710.1032Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/710/1032CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/140/631 : HST WFC3/UVIS photometry of omega Cen core (Bellini+, 2010)J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)J/ApJ/663/1021 : Log of {omega} Cen scientific images (Castellani+, 2007)J/ApJ/663/296 : UBV(RI)c phot. of omega Cen (NGC5139) subgiants (Villanova+,J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)J/PASP/106/828 : BVRI photometry of omega Cen (Walker 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/710/1032https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/710/1032http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/710/1032https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/710/1032https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/710/1032http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/710/1032GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/710/1032/table2 (Star catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/710/1032/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/710/1032/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/710/1032/table2?GETtext/xml+votable180.050000true201.62724611-47.560415560.0055555555555555566/432272.8871749643927257e-19 3.5258929735081626e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/710/1032?format=asciiOpticalInfrareddefaultJ/ApJ/710/1032/pm_starsProper-motion catalog, for the central and major-axis fieldsMDetails from table2meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFSimbad column added by the CDSobs.fieldcharXREFX position in master frame (G1)pixpos.cartesian.x;instr.detfloatYREFY position in master frame (G1)pixpos.cartesian.y;instr.detfloatBmagCalibrated VEGAMAG HST B_F435W_ band magnitudemagphot.mag;em.opt.BfloatRmagCalibrated VEGAMAG HST R_F625W_ band magnitudemagphot.mag;em.opt.RfloatmuxProper motion in X; x along -RAmas/yrpos.pmdoublee_muxError in mux (1)mas/yrstat.errorfloatmuyProper motion in Y; y along DECmas/yrpos.pmdoublee_muyError in muy (1)mas/yrstat.errorfloatmuMajProper motion projected along major axis (2)mas/yrpos.pmdoublemuMinProper motion projected along minor axis (2)mas/yrpos.pmdoublen1uNumber of 1st epoch observations in proper motion calculationmeta.numberintn2uNumber of 2nd epoch observations in proper motion calculationmeta.numberintQ[0/1]? The "good" flag (1: small internal errors) (3)meta.code.qualintnullableJ/ApJ/710/1032/table2Star catalogMSimbad column added by the CDSmeta.ref.urlcharXREF? X position in reference frame (G1)pixpos.cartesian.x;instr.detdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_XREF? RMS scatter of single-exposure X position (2)pixstat.errorfloatnullableYREF? Y position in reference frame (G1)pixpos.cartesian.y;instr.detdoublenullablee_YREF? RMS scatter of single-exposure Y position (2)pixstat.errorfloatnullableBmag? Instrumental HST F435W band (B) magnitude (1)magphot.mag;em.opt.Bdoublenullablee_Bmag? RMS scatter of single-exposure F435W observation (2)magstat.error;phot.mag;em.opt.BfloatnullableRmag? Instrumental HST F625W band (R) magnitude (1)magphot.mag;em.opt.Rdoublenullablee_Rmag? RMS scatter of single-exposure F625W observation (2)magstat.error;phot.mag;em.opt.RfloatnullableNBc[1/9]? Number of B images where star could be foundmeta.numberintnullableNBf[1/9]? Number of B images where star was foundmeta.numberintnullableNRc[1/9]? Number of R images where star could be foundmeta.numberintnullableNRf[1/9]? Number of R images where star was foundmeta.numberintnullable_RAPosition computed from a comparison with Bellini et al. catalog (2009, Cat. J/A+A/493/959) ({sigma}=~30mas) (right ascension part)degpos.eq.ra;meta.mainindexed_DEPosition computed from a comparison with Bellini et al. catalog (2009, Cat. J/A+A/493/959) ({sigma}=~30mas) (declination part)degpos.eq.dec;meta.mainindexedJ/ApJ/710/1032/artifArtificial star catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpXREFParameter X position in reference frame (G1)pixpos.cartesian.x;instr.detdoublepYREFParameter Y position in reference frame (G1)pixpos.cartesian.y;instr.detdoubleBimagInstrumental HST F435W band (B) magnitudemagphot.mag;em.opt.BdoubleRimagInstrumental HST F625W band (R) magnitudemagphot.mag;em.opt.RdoubleNdBNumber of deep F435W images star could have been found inmeta.numberintNdRNumber of deep F625W images star could have been found inmeta.numberintNsBNumber of short F435W images star could have been found inmeta.numberintNsRNumber of short F625W images star could have been found inmeta.numberintXREF? X position in reference frame (G1)pixpos.cartesian.x;instr.detdoublenullablee_XREF? RMS scatter of single-exposure X position (2)pixstat.errorfloatnullableYREF? Y position in reference frame (G1)pixpos.cartesian.y;instr.detdoublenullablee_YREF? RMS scatter of single-exposure Y position (2)pixstat.errorfloatnullableBmag? Instrumental HST F435W band (B) magnitude (1)magphot.mag;em.opt.Bdoublenullablee_Bmag? RMS scatter of single-exposure F435W observation (2)magstat.error;phot.mag;em.opt.BfloatnullableRmag? Instrumental HST F625W band (R) magnitude (1)magphot.mag;em.opt.Rdoublenullablee_Rmag? RMS scatter of single-exposure F625W observation (2)magstat.error;phot.mag;em.opt.RfloatnullableNBc[1/9]? Number of B images where star could be foundmeta.numberintnullableNBf[1/9]? Number of B images where star was foundmeta.numberintnullableNRc[1/9]? Number of R images where star could be foundmeta.numberintnullableNRf[1/9]? Number of R images where star was foundmeta.numberintnullable