J/ApJ/699/1153ivo://CDS.VizieR/J/ApJ/699/1153doi:10.26093/cds/vizier.16991153CDSRoman-Duval J.Jackson J.M.Heyer M.Johnson A.Rathborne J.Shah R.,Simon R.2012-11-13T06:15:28Z2011-07-21T11:53:26ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumradio-continuum-emissionKinematic distances to 750 molecular clouds identified in the ^13^COJ=1-0 Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey (GRS) are derived assuming the Clemens rotation curve of the Galaxy. The kinematic distance ambiguity is resolved by examining the presence of HI self-absorption toward the ^13^CO emission peak of each cloud using the Very Large Array Galactic Plane Survey. We also identify 21cm continuum sources embedded in the GRS clouds in order to use absorption features in the HI 21cm continuum to distinguish between near and far kinematic distances. The Galactic distribution of GRS clouds is consistent with a four-arm model of the Milky Way. The locations of the Scutum-Crux and Perseus arms traced by GRS clouds match star-count data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire star-count data. We conclude that molecular clouds must form in spiral arms and be short-lived (lifetimes <10^7^yr) in order to explain the absence of massive, ^13^CO bright molecular clouds in the interarm space.2009ApJ...699.1153Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/699/1153CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009)J/ApJ/699/1092 : Galactic molecular clouds (SRBY) (Heyer+, 2009)J/ApJ/626/887 : HI clouds in Southern Galactic Plane Survey (Kavars+, 2005)J/A+A/327/325 : Distances of molecular cloud (May+, 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/699/1153https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/699/1153http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/699/1153https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/699/1153https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/699/1153http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/699/1153GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/699/1153/table1 (Kinematic distances to molecular clouds in the GRS using HI self-absorption and 21cm continuum absorption)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/699/1153/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/699/1153/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/699/1153/table1?GETtext/xml+votable180.050000true292.577518.31840.0055555555555555565/7377 7383 7564 7578 7579 7604 7605 7650 7651 7654 7673 7678 7679 6/12968 12970 12971 14336 29505 29506 29507 29517 29522 29523 29526 29528 29529 29556 30216 30218 30219 30222 30223 30240 30241 30244 30245 30247 30260 30262 30263 30268 30269 30271 30306 30330 30334 30404 30405 30407 30428 30429 30592 30594 30595 30598 30599 30622 30623 30629 30644 30645 30666 30688 30689 30691 30701 30706 30707 30710https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/699/1153?format=asciiRadiodefaultJ/ApJ/699/1153/table1Kinematic distances to molecular clouds in the GRS using HI self-absorption and 21cm continuum absorptionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRSMCGalactic Ring Survey (GRS) Molecular Cloud identification (G0LL.ll+0B.bb) \linkRole{data from Rathborne et al. 2009, Cat. J/ApJS/182/131} (1)meta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latVlsrLocal Standard of Rest radial velocitykm/sspect.dopplerVeloc;pos.lsrfloatdLonSpatial FWHM of the cloud along Galactic longitudedegphys.angSize;srcfloatdLatSpatial FWHM of the cloud along Galactic latitudedegphys.angSize;srcfloatDelVFWHM velocity dispersionkm/sphys.veloc.dispersionfloatDistKinematic distance to the cloudkpcpos.distance;pos.heliocentricfloatLCOThe CO luminosity10000K.km.s**-1.pc**-2phys.luminosityfloat21cm?[y ] A 21cm continuum source?meta.codechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed