J/ApJ/853/86ivo://CDS.VizieR/J/ApJ/853/86doi:10.26093/cds/vizier.18530086CDSBellini A.Libralato M.Bedin L.R.Milone A.P.van der Marel R.P.,Anderson J.Apai D.Burgasser A.J.Marino A.F.Rees J.M.2019-03-25T13:55:38Z2019-02-07T13:57:08ZCDS support team

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

cds-question@unistra.frglobular-star-clustershst-photometryproper-motionsIn this second installment of the series, we look at the internal kinematics of the multiple stellar populations of the globular cluster {omega} Centauri in one of the parallel Hubble Space Telescope (HST) fields, located at about 3.5 half-light radii from the center of the cluster. Thanks to the over 15yr long baseline and the exquisite astrometric precision of the HST cameras, well-measured stars in our proper-motion catalog have errors as low as ~10{mu}as/yr, and the catalog itself extends to near the hydrogen-burning limit of the cluster. We show that second-generation (2G) stars are significantly more radially anisotropic than first-generation (1G) stars. The latter are instead consistent with an isotropic velocity distribution. In addition, 1G stars have excess systemic rotation in the plane of the sky with respect to 2G stars. We show that the six populations below the main-sequence (MS) knee identified in our first paper are associated with the five main population groups recently isolated on the upper MS in the core of cluster. Furthermore, we find both 1G and 2G stars in the field to be far from being in energy equipartition, with {eta}_1G_=-0.007+/-0.026 for the former and {eta}_2G_=0.074+/-0.029 for the latter, where {eta} is defined so that the velocity dispersion {sigma}_{mu}_ scales with stellar mass as {sigma}_{mu}_{propto}m^-{eta}^. The kinematical differences reported here can help constrain the formation mechanisms for the multiple stellar populations in {omega} Centauri and other globular clusters.2018ApJ...853...86Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/853/86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000)J/ApJ/654/915 : Deep FORS1 BR photometry of omega Cen (Sollima+, 2007)J/ApJ/681/1505 : Abundances of red giants in {omega} Cen (Johnson+, 2008)J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)J/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/ApJ/710/1032 : Proper motions in {omega} Cen (Anderson+, 2010)J/AJ/140/631 : HST WFC3/UVIS photometry of omega Cen core (Bellini+, 2010)J/ApJ/731/64 : Spectroscopy of 300 RGBs in {omega} Cen (Marino+, 2011)J/ApJ/797/115 : HSTPROMO I. Observations and NGC7078 results (Bellini+, 2014)J/ApJ/842/6 : Astro-photometric catalog of NGC 5139's core (Bellini+, 2017)J/ApJ/844/164 : NGC5139 HST astro-photometric analysis. III. (Bellini+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/853/86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/853/86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/853/86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/853/86https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/853/86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/853/86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/853/86/catalog (Astro-photometric catalog of field F1 (tables 6 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/853/86/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/853/86/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/853/86/catalog?GETtext/xml+votable180.050000true201.43076135593-47.693620754060.0055555555555555566/432271.1796835550914393e-19 3.999628114029321e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/853/86?format=asciidefaultJ/ApJ/853/86/catalogAstro-photometric catalog of field F1 (tables 6 and 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[48/5745] Internal identifiermeta.id;meta.mainintRAJ2000[201.36/201.45] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-47.7/-47.6] Declination (J2000)degpos.eq.dec;meta.mainXpixX pixel coordinate; 0.04"/pixpixpos.cartesian.xdoubleYpixY pixel coordinate; 0.04"/pixpixpos.cartesian.ydoublepmRAr[-38.6/12.4] Raw proper motion along RA times cos(DE)mas/yrpos.pm;pos.eq.radoublee_pmRAr[0.006/6] Uncertainty in pmRArmas/yrstat.error;pos.pm;pos.eq.radoublepmDEr[-26/18.2] Raw proper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmDEr[0.005/7] Uncertainty in pmDErmas/yrstat.error;pos.pm;pos.eq.decdoublechi2X[0.08/55.2] Reduced {chi}^2^ of X pixel fitstat.fit.chi2floatchi2Y[0.04/54.7] Reduced {chi}^2^ of Y pixel fitstat.fit.chi2floatnf[5/55] Number of single exposures star found inmeta.numberintnu[4/55] Number of single measurements used to compute astrometric quantitiesmeta.numberintDelTime[1.9/15.2] Temporal baseline used for proper motionsyrtime.intervaldoublepmRAc[-38.5/12.4] Corrected proper motion along RA times cos(DE)mas/yrpos.pm;pos.eq.radoublee_pmRAc[0.02/6] Uncertainty in pmRAcmas/yrstat.error;pos.pm;pos.eq.radoublepmDEc[-26/18.1] Corrected proper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmDEc[0.03/7] Uncertainty in pmDEcmas/yrstat.error;pos.pm;pos.eq.decdoubleF606Wmag[15.6/29.9] F606W filter VEGA magnitude (1)magphot.mag;em.opt.RfloatF606Wrms[0/99.99] F606W filter RMS magnitude (1)magstat.errorfloatF606WQFIT[0/1] F606W filter QFIT valuemeta.code.qualfloatF606Wo[0/9999.99] F606W filter initial ratio (2)stat.fit.omcdoubleF606WRADXS[-9.999/9] F606W filter RADXS parameter (3)stat.fit.paramfloatF606Wnf[0/8] Number of single exposures star is in F606W filtermeta.numberintF606Wnu[0/8] Number of single measurements used to compute photometric quantities in F606W filtermeta.numberintF606Wsky[0/9999.9] Local sky value at star in F606W filter (4)einstr.skyLevel;pos.lg;obs.fieldfloatF606Wrmssky[0/9999.9] F606W filter RMS of the sky (4)estat.errorfloatF814Wmag[14.8/28.9] F814W filter VEGA magnitude (1)magphot.mag;em.opt.IfloatF814Wrms[0/99.99] F814W filter RMS magnitude (1)magstat.errorfloatF814WQFIT[0/1] F814W filter QFIT valuemeta.code.qualfloatF814Wo[0/46.8] F814W filter initial ratio (2)stat.fit.omcdoubleF814WRADXS[-0.7/2.5] F814W filter RADXS parameter (3)stat.fit.paramfloatF814Wnf[0/8] Number of single exposures star is in F814W filtermeta.numberintF814Wnu[0/8] Number of single measurements used to compute photometric quantities in F814W filtermeta.numberintF814Wsky[0/9999.9] Local sky value at star in F814W filter (4)einstr.skyLevel;pos.lg;obs.fieldfloatF814Wrmssky[0/9999.9] F814W filter RMS of the sky (4)estat.errorfloatF110Wmag[14.5/28.8]? HST/WFC3 IR F110W filter VEGA magnitude (1)magphot.mag;em.IR.JfloatnullableF110Wrms[0/99.99] F110W filter RMS magnitude (1)magstat.errorfloatF110WQFIT[0/1] F110W filter QFIT valuemeta.code.qualfloatF110Wo[0/9999.9] F110W filter initial ratio (2)stat.fit.omcdoubleF110WRADXS[-9.999/9.999] F110W filter RADXS parameter (3)stat.fit.paramfloatF110Wnf[0/28] Number of single exposures star is in F110W filtermeta.numberintF110Wnu[0/28] Number of single measurements used to compute photometric quantities in F110W filtermeta.numberintF110Wsky[0/1748.2] Local sky value at star in F110W filter (5)e.s**-1instr.skyLevel;pos.lg;obs.fieldfloatF110Wrmssky[0/2865] F110W filter RMS of the sky (5)e.s**-1stat.errorfloatF160Wmag[13.9/29.7]? HST/WFC3 IR F160W filter VEGA magnitude (1)magphot.mag;em.IR.HfloatnullableF160Wrms[0/99.99] F160W filter RMS magnitude (1)magstat.errorfloatF160WQFIT[0/1] F160W filter QFIT valuemeta.code.qualfloatF160Wo[0/9999.9] F160W filter initial ratio (2)stat.fit.omcdoubleF160WRADXS[-9.999/9.999] F160W filter RADXS parameter (3)stat.fit.paramfloatF160Wnf[0/28] Number of single exposures star is in F160W filtermeta.numberintF160Wnu[0/28] Number of single measurements used to compute photometric quantities in F160W filtermeta.numberintF160Wsky[0/797.7] Local sky value at star in F160W filter (5)e.s**-1instr.skyLevel;pos.lg;obs.fieldfloatF160Wrmssky[0/1237.5] F160W filter RMS of the sky (5)e.s**-1stat.errorfloatB09Display data from Bellini+, 2009, J/A+A/493/959 within 0.2"meta.ref.urlintnullableJ/ApJ/853/86/table1List of HST observations of field F1EpochEpoch numbermeta.numbercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstHST instrument (ACS/WFC or WFC3/IR, WFC3/UVIS)instrcharFiltFilter (F110W to F814W)meta.id;instr.filtercharExpExposure(s) timetime.duration;obs.exposurecharPID[9444/14662] Program identifiermeta.id;obsintPIPI nameobs.observercharDateObservation date(s)time.epoch;obschar