J/ApJ/723/492ivo://CDS.VizieR/J/ApJ/723/492doi:10.26093/cds/vizier.17230492CDSRoman-Duval J.Jackson J.M.Heyer M.Rathborne J.Simon R.2019-12-03T11:03:33Z2012-08-10T10:28:07ZCDS support team

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

cds-question@unistra.frmolecular-cloudsmilky-way-galaxyradio-astronomysurveysWe derive the physical properties of 580 molecular clouds based on their ^12^CO and ^13^CO line emission detected in the University of Massachusetts-Stony Brook (UMSB) and Galactic Ring surveys (GRS). We provide a range of values of the physical properties of molecular clouds, and find a power-law correlation between their radii and masses, suggesting that the fractal dimension of the interstellar medium is around 2.36. This relation, M=(228+/-18)R^2.36+/-0.04^, allows us to derive masses for an additional 170 Galactic Ring Survey (GRS) molecular clouds not covered by the UMSB survey. We derive the Galactic surface mass density of molecular gas and examine its spatial variations throughout the Galaxy. We find that the azimuthally averaged Galactic surface density of molecular gas peaks between Galactocentric radii of 4 and 5kpc. Although the Perseus arm is not detected in molecular gas, the Galactic surface density of molecular gas is enhanced along the positions of the Scutum-Crux and Sagittarius arms.2010ApJ...723..492Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/723/492CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/196/18 : CO survey of galactic molecular clouds. II. (Bieging+, 2011)J/MNRAS/410/1237 : Red MSX survey (RMS) massive young stars (Urquhart+, 2011)J/PASJ/62/557 : CO clouds in the GC from NANTEN (Takeuchi+, 2010)J/ApJ/699/1153 : Kinematic distances to GRS molecular clouds (Roman-Duval+,J/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009)J/ApJ/672/930 : CO clouds in third Galactic quadrant (Vazquez+, 2008)J/PASJ/57/917 : CO molecular clouds in southern Galactic Warp (Nakagawa+,https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/723/492https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/723/492http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/723/492https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/723/492https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/723/492http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/723/492GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/723/492/table1 (Catalog of Molecular Cloud's Masses and Physical Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/723/492/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/723/492/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/723/492/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/723/492?format=asciiRadiodefaultJ/ApJ/723/492/table1Catalog of Molecular Cloud's Masses and Physical PropertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRSMCGRS [Galactic Ring Survey] molecular cloud name (G0LL.ll+0B.bb)meta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latVLSRLocal Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatDelVFull-Width at Half-Maximum velocity dispersionkm/sspect.line.widthfloatRadPhysical radiuspcphys.size.radiusfloatMassMolecular cloud masssolMassphys.massdoublee_MassUncertainty in MasssolMassstat.error;phys.massdoublenH2Mean number density of H_2_cm**-3meta.idfloatTexMean excitation temperatureKphys.atmol.excitation;stat.meanfloattauMean ^13^CO center-of-line optical depth {tau}phys.absorption.opticalDepth;stat.meanfloatSigmaMean surface mass density of the cloud {Sigma}solMass.pc**-2phot.flux.density.sb;stat.meanfloatalphaVirial {alpha} parameter (1)phys.mass;arith.ratiofloatNote[io] Cloud inside (i) or outside (o) the University of Massachusetts-Stony Brook (UMSB) Survey.meta.notecharRD09Link to GRS molecular clouds data from Roman-Duval et al., 2009, Cat. J/ApJ/699/1153meta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed