J/ApJ/783/130ivo://CDS.VizieR/J/ApJ/783/130doi:10.26093/cds/vizier.17830130CDSReid M.J.Menten K.M.Brunthaler A.Zheng X.W.Dame T.M.Xu Y.Wu Y.,Zhang B.Sanna A.Sato M.Hachisuka K.Choi Y.K.Immer K.,Moscadelli L.Rygl K.L.J.Bartkiewicz A.2017-01-23T22:00:00Z2016-04-21T15:00:30ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyastrophysical-masersradio-astronomyvisible-astronomytrigonometric-parallaxproper-motionsstellar-associationsOver 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured with the Bar and Spiral Structure Legacy Survey, a Very Long Baseline Array key science project, the European VLBI Network, and the Japanese VLBI Exploration of Radio Astrometry project. These measurements provide strong evidence for the existence of spiral arms in the Milky Way, accurately locating many arm segments and yielding spiral pitch angles ranging from about 7{deg} to 20{deg}. The widths of spiral arms increase with distance from the Galactic center. Fitting axially symmetric models of the Milky Way with the three-dimensional position and velocity information and conservative priors for the solar and average source peculiar motions, we estimate the distance to the Galactic center, R_0_, to be 8.34+/-0.16kpc, a circular rotation speed at the Sun, {Theta}_0_, to be 240+/-8km/s, and a rotation curve that is nearly flat (i.e., a slope of -0.2+/-0.4km/s/kpc) between Galactocentric radii of {approx}5 and 16kpc. Assuming a "universal" spiral galaxy form for the rotation curve, we estimate the thin disk scale length to be 2.44+/-0.16kpc. With this large data set, the parameters R_0_ and {Theta}_0_are no longer highly correlated and are relatively insensitive to different forms of the rotation curve. If one adopts a theoretically motivated prior that high-mass star forming regions are in nearly circular Galactic orbits, we estimate a global solar motion component in the direction of Galactic rotation, V_{sun}_=14.6+/-5.0km/s. While {Theta}_0_and V_{sun}_are significantly correlated, the sum of these parameters is well constrained, {Theta}_0_+V_{sun}_=255.2+/-5.1km/s, as is the angular speed of the Sun in its orbit about the Galactic center, ({Theta}_0_+V_{sun}_)/R_0_=30.57+/-0.43km/s/kpc. These parameters improve the accuracy of estimates of the accelerations of the Sun and the Hulse-Taylor binary pulsar in their Galactic orbits, significantly reducing the uncertainty in tests of gravitational radiation predicted by general relativity.2014ApJ...783..130Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/783/130CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/112 : Catalog of Star-Forming Regions in the Galaxy (Avedisova, 2002)J/ApJ/720/1055 : VBLA observations of W51 Main/South (Sato+, 2010)http://bessel.vlbi-astrometry.org/ : BeSSeL surveyhttp://veraserver.mtk.nao.ac.jp/ : Japanese VERAhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/783/130https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/783/130http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/783/130https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/783/130https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/783/130http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/783/130GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/783/130/table1 (Parallaxes and proper motions of high-mass star forming regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/783/130/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/783/130/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/783/130/table1?GETtext/xml+votable180.050000true260.0168333-38.975250.0055555555555555566/1340 1470 2973 3011 3061 3262 3311 3649 14063 14241 14280 14287 14309 14314 14317 14353 14594 14611 14621 14622 14643 14655 14671 14674 14689 14692 14704 15409 15429 15458 15473 15671 15676 15681 15759 21439 21510 21542 22212 23764 23795 23969 24189 24325 24362 24499 28830 28912 29091 29092 29094 29096 29097 29100 29101 29103 29113 29114 29116 29461 29532 29533 30219 30245 30258 30259 30269 30312 30313 30318 30319 30328 30405 30425 30617 30618 30622 30644 30691 30694 30715 39895 39905 40612 42436 42457https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/783/130?format=asciiRadioOpticaldefaultJ/ApJ/783/130/table1Parallaxes and proper motions of high-mass star forming regionsNameGalactic source name/coordinatespos.galacticcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAliasAlias namemeta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainplxTrigonometric Parallaxmaspos.parallax.trigfloate_plxUncertainty in plx (1)masstat.error;pos.parallaxfloatpmXEastward Proper Motion (Motion in RA multiplied by cos(Dec); {mu}_x_={mu}_{alpha}_cos{delta}) (2)mas/yrpos.pm;pos.eq.rafloate_pmXUncertainty in pmXmas/yrstat.errorfloatpmYNorthward Proper Motion ({mu}_y_={mu}_{delta}_ (2)mas/yrpos.pm;pos.eq.decfloate_pmYUncertainty in pmYmas/yrstat.errorfloatVLSRLocal Standard of Rest velocity v_LSR_ (2)km/sphys.veloc;pos.lsrinte_VLSRUncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrintArmSpiral arm designator; based mostly on association with structure seen in l-V plots of CO and HI emission (not using the measured parallaxes) (3)meta.id.parentcharRefReference (in refs.dat file)meta.ref;pos.framecharJ/ApJ/783/130/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference identifierpos.framecharAutAuthor's namemeta.bib.authorcharBibCodeBibliographic codemeta.bib.bibcodecharComCommentmeta.notechar