J/MNRAS/505/5978ivo://CDS.VizieR/J/MNRAS/505/5978doi:10.26093/cds/vizier.75055978CDSVasiliev E.Baumgardt H.2024-08-21T20:18:01Z2021-07-16T09:59:20ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyglobular-star-clustersproper-motionsWe use the data from Gaia Early Data Release 3 (EDR3) to study the kinematic properties of Milky Way globular clusters. We measure the mean parallaxes and proper motions (PM) for 170 clusters, determine the PM dispersion profiles for more than 100 clusters, uncover rotation signatures in more than 20 objects, and find evidence for radial or tangential PM anisotropy in a dozen richest clusters. At the same time, we use the selection of cluster members to explore the reliability and limitations of the Gaia catalogue itself. We find that the formal uncertainties on parallax and PM are underestimated by 10-20% in dense central regions even for stars that pass numerous quality filters. We explore the spatial covariance function of systematic errors, and determine a lower limit on the uncertainty of average parallaxes and PM at the level 0.01mas and 0.025mas/yr, respectively. Finally, a comparison of mean parallaxes of clusters with distances from various literature sources suggests that the parallaxes for stars with G>13 (after applying the zero-point correction suggested by Lindegren et al. (2021A&A...649A...4L) are overestimated by ~0.01+/-0.003mas. Despite these caveats, the quality of Gaia astrometry has been significantly improved in EDR3 and provides valuable insights into the properties of star clusters.2021MNRAS.505.5978Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/505/5978CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/MNRAS/482/5138 : Galactic GC proper motions & velocities (Baumgardt+, 2019)J/MNRAS/505/5957 : GC distances (Baumgardt & Vasiliev, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/505/5978https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/505/5978http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/505/5978https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/505/5978https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/505/5978http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/505/5978GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/505/5978/tablea1 (The catalogue of cluster proper motions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/505/5978/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/505/5978/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/505/5978/tablea1?GETtext/xml+votable180.050000true6.024-72.0810.0055555555555555566/1133 3950 6212 6389 9436 9666 10008 10321 10336 12032 12405 12425 12507 12531 12687 12943 14489 16647 17121 17711 19091 20001 21017 24843 25486 25873 27237 27852 27981 27986 28067 28577 28705 28717 28732 28741 28751 28768-28769 28778 28781 28805 28808 28815 28817 28833 28835 28838 28849 28855 28867-28868 28876-28877 28882 28889 28895 28903 28905 28959 28962 28970 28973-28974 29077 29184 29187 29195 29202 29216 29222 29231 29233 29248 29267 29289 29294 29318 29377 29504 29626 29632 29636-29637 29647 29816 29870 30223 30321 30323 30378 30769 30998 31019 31043 31095 31115 31128 31398 31417 31723 32083 33321 33330 33635 34242 34317 34811 36971 37211 37294 38230 38465 39642 39954 41011 41257 41304 41507 41522 41624 41847 41852 42076 42152-42153 42204 42278 42314 42320 42360-42361 42466 42528 42567 42700 42761 42789 42841 42862 42955 42958 42990 43125 43193 43227 43894 43924 44086 44220 44427 47125 47620 47745 47777 47825 47866 47868 47903 47916 47935 47971 48035 48434 48444 48698 48952https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/505/5978?format=asciidefaultJ/MNRAS/505/5978/tablea1The catalogue of cluster proper motionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCommon name, NGC identifier, etc.meta.id;meta.maincharONameOther namemeta.idcharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainpmRAProper motion in right ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty (including systematic) in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty (including systematic) in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatcorrCorrelation coefficient between uncertaintiesstat.fit.paramfloatplxParallaxmaspos.parallax.trigfloate_plxUncertainty (including systematic) in plxmasstat.error;pos.parallaxfloatRscaleScale radius of Gaia-detected cluster membersarcminphys.angSizefloatNstarNumber of Gaia-detected cluster member starsmeta.numberintSimbadNameSimbad column added by the CDSmeta.idchar