J/ApJ/926/141ivo://CDS.VizieR/J/ApJ/926/141doi:10.26093/cds/vizier.19260141CDSTheissen C.AKonopacky Q.M.Lu J.R.Kim D.Zhang S.Y.Hsu C.H.,Chu L.Wei L.2022-10-26T11:17:10Z2022-03-16T08:44:45ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocityproper-motionseffective-temperatureinfrared-astronomyspectroscopyvisible-astronomyThe kinematics and dynamics of stellar and substellar populations within young, still-forming clusters provide valuable information for constraining theories of formation mechanisms. Using Keck II NIRSPEC+AO data, we have measured radial velocities for 56 low-mass sources within 4' of the core of the Orion Nebula Cluster (ONC). We also remeasure radial velocities for 172 sources observed with SDSS/APOGEE. These data are combined with proper motions measured using HST ACS/WFPC2/WFC3IR and Keck II NIRC2, creating a sample of 135 sources with all three velocity components. The velocities measured are consistent with a normal distribution in all three components. We measure intrinsic velocity dispersions of ({sigma}_{nu}{alpha}_, {sigma}_{nu}{beta}_, {sigma}_{nu}{delta}_ ) = (1.64+/-0.12, 2.03+/-0.13, 2.56^0.17^_0.16_) km/s. Our computed intrinsic velocity dispersion profiles are consistent with the dynamical equilibrium models from Da Rio et al. (2017ApJ...845..105D) in the tangential direction but not in the line-of-sight direction, possibly indicating that the core of the ONC is not yet virialized, and may require a nonspherical potential to explain the observed velocity dispersion profiles. We also observe a slight elongation along the north-south direction following the filament, which has been well studied in previous literature, and an elongation in the line-of-sight to tangential velocity direction. These 3D kinematics will help in the development of realistic models of the formation and early evolution of massive clusters.2022ApJ...926..141Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/926/141CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000)J/AJ/157/109 : Stellar proper motions in the Orion Nebula Cluster (Kim+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/926/141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/926/141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/926/141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/926/141https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/926/141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/926/141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/926/141/table3 (NIRSPEC forward-modeling results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/926/141/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/926/141/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/926/141/table3?GETtext/xml+votable180.050000true83.8095-5.406861110.005555555555555556Cone search capability for table J/ApJ/926/141/table5 (APOGEE forward-modeling results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/926/141/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/926/141/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/926/141/table5?GETtext/xml+votable180.050000true83.75420833-5.402861110.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/926/141?format=asciiOpticalInfrareddefaultJ/ApJ/926/141/table3NIRSPEC forward-modeling resultsRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[HC2000]Identifier Hillenbrand & Carpenter, 2000ApJ...540..236H, Cat. J/ApJ/540/236meta.id;meta.mainintm_[HC2000][AB] Multiplicty index on [HC2000]meta.code.multipcharID? Kim et al. (2019AJ....157..109K, Cat. J/AJ/157/109) identifiermeta.idintnullableRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_RVRadial velocity uncertainty (1)km/sstat.errorfloatpmRA? Proper motion in Right Ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Proper motion in Right Ascension uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Proper motion in Declination uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatnullableTeffModel effective temperature (2)Kphys.temperature.effective;meta.modelledinte_TeffModel effective temperature uncertaintyKstat.error;phys.temperature.effectiveintvsiniRotational velocitykm/sphys.veloc.rotatfloate_vsiniRotational velocity uncertaintykm/sstat.error;phys.veloc.rotatfloatVeilingOrder 33 veiling parameterphys.absorptionfloatNoteNote (3)meta.notecharJ/ApJ/926/141/table5APOGEE forward-modeling resultsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPOGEEAPOGEE 2MASS Identifiermeta.id;meta.maincharID? Kim et al. (2019AJ....157..109K, Cat. J/AJ/157/109) Identifiermeta.idintnullableRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVRadial velocity uncertaintykm/sstat.errorfloatpmRA? Proper motion in Right Ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Proper motion in Right Ascension uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Proper motion in Declination uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatnullableTeffModel effective temperature (1)Kphys.temperature.effective;meta.modelledfloate_TeffModel effective temperature uncertaintyKstat.error;phys.temperature.effectivefloatvsiniRotational velocitykm/sphys.veloc.rotatfloate_vsiniRotational velocity uncertaintykm/sstat.error;phys.veloc.rotatfloatVeilingH-band veiling parameterphys.absorptionfloatNoteNote (2)meta.notechar