J/ApJ/831/124ivo://CDS.VizieR/J/ApJ/831/124doi:10.26093/cds/vizier.18310124CDSMcClure-Griffiths N.M.Dickey J.M.2017-06-12T08:25:02Z2017-03-03T09:42:53ZCDS support team

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

cds-question@unistra.frgalaxy-planesmilky-way-galaxyh-i-line-emissionsurveysUsing atomic hydrogen (HI) data from the VLA Galactic Plane Survey, we measure the HI terminal velocity as a function of longitude for the first quadrant of the Milky Way. We use these data, together with our previous work on the fourth Galactic quadrant, to produce a densely sampled, uniformly measured, rotation curve of the northern and southern Milky Way between 3kpc<R<8kpc. We determine a new joint rotation curve fit for the first and fourth quadrants, which is consistent with the fit we published in McClure-Griffiths & Dickey (Paper I, 2007ApJ...671..427M) and can be used for estimating kinematic distances interior to the solar circle. Structure in the rotation curves is now exquisitely well defined, showing significant velocity structure on lengths of ~200pc, which is much greater than the spatial resolution of the rotation curve. Furthermore, the shape of the rotation curves for the first and fourth quadrants, even after subtraction of a circular rotation fit shows a surprising degree of correlation with a roughly sinusoidal pattern between 4.2<R<7kpc.2016ApJ...831..124Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/831/124CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/ApJ/816/42 : Mass models for the Milky Way (McGaugh, 2016)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/ApJS/140/331 : High-velocity HI observations at 21cm (Lockman+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/831/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/831/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/831/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/831/124https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/831/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/831/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/831/124/table1Inner Galaxy HI terminal velocity curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLON[18.4/67] Galactic longitude in decimal degreesdegpos.galactic.lonvLSR[18.7/134.2] Measured HI terminal velocitieskm/sphys.velocfloatvMOD[27.7/138] Predicted HI terminal velocities (1)km/sphys.velocfloat