J/ApJ/906/24ivo://CDS.VizieR/J/ApJ/906/24doi:10.26093/cds/vizier.19060024CDSDzib S.A.Forbrich J.Reid M.J.Menten K.M.2022-10-14T13:03:26Z2022-06-08T07:42:31ZCDS support team

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

cds-question@unistra.fropen-star-clustersradio-sourcesradio-astronomyastrometryFrom Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources in the Gaia DR2 catalog for 34 of them within 0.2 of the radio positions. Most of the radio sources are likely companions of Gaia detections. However, there are 11 stars whose VLBA positions differ from Gaia by <1.6mas, and some of these radio sources probably are the direct counterparts of the optical stars. We are able to obtain radio proper motions for 23 stars. Combining the stellar proper motions derived from the VLBA and Gaia DR2 data we find the global motion and velocity dispersion of the ONC to be ({mu}{alpha}*,{mu}{delta})=(1.20{+/-}0.09,0.18{+/-}0.09)mas/yr and ({sigma}_{mu}_{alpha}__,{sigma}_{mu}_{delta}__)=(0.84{+/-}0.09,1.30{+/ -}0.09)mas/yr. Finally, we looked for ordered motions by estimating the means of scalar and vectorial products, which results in \overline{nu}.r=-0.61{+/-}1.00km/s and {nu}xr=0.57{+/-}0.95km/s. These do not show indications that the young stellar cluster is in expansion, contraction, or rotation.2021ApJ...906...24Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/906/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/ApJS/160/353 : Membership of the Orion nebula population (Getman+, 2005)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/AJ/146/85 : Spectral types 1576 optical stars in ONC (Hillenbrand+, 2013)J/ApJ/790/49 : Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014)J/ApJ/822/93 : The population compact radio sources in ONC (Forbrich+, 2016)J/A+A/587/A153 : VISION I. VISTA Orion A Survey (Meingast+, 2016)J/ApJ/834/142 : Gould's Belt Distances Survey. II. OMC (Kounkel+, 2017)J/MNRAS/467/L71 : Significance of VLBI/Gaia position offsets (Petrov+, 2017)J/AJ/157/109 : Stellar proper motions in the Orion Nebula Cluster (Kim+, 2019)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)J/AJ/159/272 : Orion Nebula Cluster PMs HST Treasury Program (Platais+, 2020)J/ApJ/906/23 : A VLBA Survey of radio stars in the ONC. I. (Forbrich+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/906/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/906/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/906/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/906/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/906/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/906/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/906/24/table2 (Positions of detected sources in the VLBA images and their formal errors as derived from Imfit)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/906/24/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/906/24/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/906/24/table2?GETtext/xml+votable180.050000true83.733231075-5.386951150.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/906/24?format=asciiRadiodefaultJ/ApJ/906/24/table2Positions of detected sources in the VLBA images and their formal errors as derived from ImfitSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[FRM2016]Source identifiermeta.id;meta.maincharprimaryEpochEpoch of observationtime.epochcharf_[FRM2016]Source detected at a level between 6.0-6.5 times the images noise flagged with letter bmeta.codecharRAJ2000[5] Hour of right ascension (J2000)pos.eq.ra;meta.maine_RAJ2000Error on RAssstat.error;pos.eq.raintDEJ2000[5/5] Degree of declination (J2000)pos.eq.dec;meta.maine_DEJ2000[32/868] Error on DEs; in {mu}arcsecarcsecstat.error;pos.eq.decintGaia? Gaia identifiermeta.idnullablef_Gaia[a] Flag on Gaia (1)meta.codecharSep[0.5/200]? Total separation between the Gaia and VLBAmaspos.angDistancefloatnullablee_Sep[0.2/5]? Error on Sepmasstat.errorfloatnullableSepRA[-195/124]? Separation between the Gaia and VLBA in RA directionmaspos.angDistancefloatnullablee_SepRA[0.2/7]? Error on SepRAmasstat.errorfloatnullableSepDE[-150/181]? Separation between the Gaia and VLBA in DE directionmaspos.angDistancefloatnullablee_SepDE[0.2/7]? Error in SepDEmasstat.errorfloatnullablepmProper motion available (table3)meta.ref.urlcharJ/ApJ/906/24/table3Sources with determined proper motions from VLBA observations[FRM2016]Source identifiermeta.id;meta.maincharpmRA-Gaia[-1.45/3.77]? Proper motion in RA, Gaia DR2mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-Gaia[0.1/0.6]? Error on pmRA-Gaiamas/yrstat.error;pos.pmfloatnullablepmDE-Gaia[-1.72/2.61]? Proper motion in DE, Gaia DR2mas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-Gaia[0.08/0.5]? Error on pmDE-Gaiamas/yrstat.error;pos.pmfloatnullableMass[0.02/5.6]? Mass lower limit (3)solMassphys.mass;stat.minfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_[FRM2016][b] Source detected only in two epochs, the errors may be underestimatedmeta.codecharNameOther identifiermeta.idcharSpTSpectral type(s) (1)src.spTypecharpmRA-VLBA[-12.1/8.59] Proper motion in RA, VLBAmas/yrpos.pm;pos.eq.rafloate_pmRA-VLBA[0.05/0.7] Error on pmRA-VLBAmas/yrstat.error;pos.pmfloatpmDE-VLBA[-42.2/2.38] Proper motion in DE, VLBAmas/yrpos.pm;pos.eq.decfloate_pmDE-VLBA[0.07/2] Error on pmDE-VLBAmas/yrstat.error;pos.pmfloatSep[0.4/184]? Total angular separation, GAIA DR2maspos.angDistancefloatnullablee_Sep[0.1/2]? Error on Sepmasstat.errorfloatnullablef_Sep[c] Flag on Sep (2)meta.codechar