J/ApJ/939/68ivo://CDS.VizieR/J/ApJ/939/68doi:10.26093/cds/vizier.19390068CDSHosek M.W.JrDo T.Lu J.R.Morris M.R.Ghez A.M.Martinez G.D.,Anderson J.2023-08-25T12:59:15Z2023-05-15T12:36:47ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsinfrared-photometryWe present new absolute proper-motion measurements for the Arches and Quintuplet clusters, two young massive star clusters near the Galactic center. Using multiepoch HST observations, we construct proper-motion catalogs for the Arches (~35000 stars) and Quintuplet (~40000 stars) fields in ICRF coordinates established using stars in common with the Gaia EDR3 catalog. The bulk proper motions of the clusters are measured to be ({mu}_RA*cosDE_, {mu}_DE_)=(-0.80+/-0.032, -1.89+/-0.021) mas yr^-1^ for the Arches and ({mu}_{alpha}*_, {mu}_{delta}_) = (-0.96+/-0.032, -2.29+/-0.023) mas yr^-1^ for the Quintuplet, achieving >=5x higher precision than past measurements. We place the first constraints on the properties of the cluster orbits that incorporate the uncertainty in their current line-of-sight distances. The clusters will not approach closer than ~25pc to Sgr A*, making it unlikely that they will inspiral into the nuclear star cluster within their lifetime. Further, the cluster orbits are not consistent with being circular; the average value of r_apo_/r_peri_ is ~1.9 (equivalent to an eccentricity of ~0.31) for both clusters. Lastly, we find that the clusters do not share a common orbit, challenging one proposed formation scenario in which the clusters formed from molecular clouds on the open stream orbit derived by Kruijssen et al. (2015MNRAS.447.1059K). Meanwhile, our constraints on the birth location and velocity of the clusters offer mild support for a scenario in which the clusters formed via collisions between gas clouds on the x_1_ and x_2_ bar orbit families.2022ApJ...939...68Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/939/68CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/581/258 : Infrared photometry in the Arches Cluster (Figer+, 2002)J/A+A/501/563 : HKs photometry in the Arches cluster (Espinoza+, 2009)J/A+A/494/1137 : Quintuplet cluster K-band spectral catalog (Liermann+, 2009)J/ApJ/718/810 : Arches cluster astrometry and photometry (Stolte+, 2010)J/ApJ/751/132 : Keck observations of the Arches cluster (Clarkson+, 2012)J/A+A/556/A26 : Arches cluster: IR phot., extinction & masses (Habibi+, 2013)J/A+A/578/A4 : Photometry and motions in Arches & Quintuplet (Stolte+, 2015)J/A+A/617/A65 : Stellar population of the Arches cluster (Clark+, 2018)J/A+A/618/A2 : Quintuplet cluster updated stellar census (Clark+, 2018)J/ApJ/789/115 : Quintuplet cluster astrometry and photometry (Stolte+, 2019)J/ApJ/789/115 : Quintuplet cluster astrometry and photometry (Stolte+, 2019)J/A+A/647/A110 : Arches cluster JVLA 6 & 10GHz images (Gallego-Calvente+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/939/68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/939/68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/939/68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/939/68https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/939/68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/939/68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/939/68/table3 (Absolute proper motion catalog of the Arches Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/939/68/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/939/68/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/939/68/table3?GETtext/xml+votable180.050000true266.4574342-28.82289220.005555555555555556Cone search capability for table J/ApJ/939/68/table4 (Absolute proper motion catalog of the Quintuplet Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/939/68/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/939/68/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/939/68/table4?GETtext/xml+votable180.050000true266.5544778-28.85297810.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/939/68?format=asciiInfrareddefaultJ/ApJ/939/68/table3Absolute proper motion catalog of the Arches ClusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Namemeta.id;meta.maincharF127M? F127M magnitudemagphot.mag;em.IR.Jfloatnullablee_F127M? Error on F127M magnitudemagstat.errorfloatnullableF139M? F139M magnitudemagphot.mag;em.IR.Jfloatnullablee_F139M? Error on F139M magnitudemagstat.errorfloatnullableF153M? F153M magnitudemagphot.mag;em.IR.Hfloatnullablee_F153M? Error on F153M magnitudemagstat.errorfloatnullabledRARA*cosDE position offset (1)arcsecpos.eq.ra;arith.diffdoublet0Timeyrtime.epochdoublee_dRAError in RA*cosDE position offsetarcsecstat.errordoubledDEDE position offset (1)arcsecpos.eq.dec;arith.diffdoublee_dDEError in DE position offsetarcsecstat.errordoublepmRAProper motion in RA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAError in Proper motion in RA*cosDEmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDEError in proper motion in DEmas/yrstat.error;pos.pm;pos.eq.decfloatNobsNumber of Epochs Observedmeta.numberintchi2RAChi2 of proper motion fit in RA*cosDEstat.fit.chi2;pos.pm;stat.fit.paramfloatchi2DEChi2 of proper motion fit in DEstat.fit.chi2;pos.pm;stat.fit.paramfloatPclustCluster membership probabilitystat.probabilityfloat_RAPositions from offsets (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from offsets (declination part)degpos.eq.dec;meta.mainindexedJ/ApJ/939/68/table4Absolute proper motion catalog of the Quintuplet Clustert0Timeyrtime.epochdoubleNobsNumber of Epochs Observedmeta.numberintchi2RAChi2 of proper motion fit in RA*cosDEstat.fit.chi2;pos.pm;stat.fit.paramfloatchi2DEChi2 of proper motion fit in DEstat.fit.chi2;pos.pm;stat.fit.paramfloatPclustCluster membership probabilitystat.probabilityfloat_RAPositions from offsets (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from offsets (declination part)degpos.eq.dec;meta.mainindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Namemeta.id;meta.maincharF127M? F127M magnitudemagphot.mag;em.IR.Jfloatnullablee_F127M? Error on F127M magnitudemagstat.errorfloatnullableF139M? F139M magnitudemagphot.mag;em.IR.Jfloatnullablee_F139M? Error on F139M magnitudemagstat.errorfloatnullableF153M? F153M magnitudemagphot.mag;em.IR.Hfloatnullablee_F153M? Error on F153M magnitudemagstat.errorfloatnullabledRARA*cosDE position offset (1)arcsecpos.eq.ra;arith.diffdoublee_dRAError in RA*cosDE position offsetarcsecstat.errordoubledDEDE position offset (1)arcsecpos.eq.dec;arith.diffdoublee_dDEError in DE position offsetarcsecstat.errordoublepmRAProper motion in RA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAError in Proper motion in RA*cosDEmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDEError in proper motion in DEmas/yrstat.error;pos.pm;pos.eq.decfloat