J/other/RAA/24.Kivo://CDS.VizieR/J/other/RAA/24.K5018CDSFeng H.Chen Z.Jiang Z.Ma Y.Yang Y.Yu S.Ge D.Zhou W.Du F.,Wang C.ZhanG S.Su Y.Yang J.2025-09-01T07:18:35Z2025-08-28T13:19:03ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyinterstellar-mediumradio-astronomyco-line-emissionStructures in molecular ISM are observed to follow a power-law relation between the velocity dispersion and spatial size, known as Larson's first relation, which is often attributed to the turbulent nature of molecular ISM and imprints the dynamics of molecular cloud structures. Using the ^13^CO (J=1-0) data from the Milky Way Imaging Scroll Painting survey, we built a sample with 360 structures having relatively accurate distances obtained from either the reddened background stars with Gaia parallaxes or associated maser parallaxes, spanning from 0.4 to ~15kpc. Using this sample and about 0.3 million pixels, we analyzed the correlations between velocity dispersion, surface/column density, and spatial scales. Our structure-wise results show power-law indices smaller than 0.5 in both the {sigma}_v_-Reff and {sigma}_v_-Reff.{SIGMA} relations. In the pixel-wise results, the {sigma}^pix^_v_ is statistically scaling with the beam physical size (Rs={THETA}D/2) in form of {sigma}^pix^_v_{prop.to}Rs^0.43+/-0.03^. Meanwhile, svpix in the inner Galaxy is statistically larger than the outer side. We also analyzed correlations between {sigma}^pix^_v_ and the H_2_ column density N(H_2_), finding that {sigma}^pix^_v_ stops increasing with N(H_2_) after >~10^22^cm^-2^. The structures with and without high-column-density (>10^22^cm^-2^) pixels show different {sigma}^pix^_v_{prop.to}N(H_2_)^xi^ relations, where the mean (std) xi values are 0.38 (0.14) and 0.62 (0.27), respectively.2024RAA....24k5018Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/24.K5018CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/24.K5018https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/24.K5018http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/24.K5018https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/24.K5018https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/24.K5018http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/24.K5018GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/RAA/24.K5018/table1 (Properties of the identified ^13^CO structures)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/24.K5018/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/24.K5018/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/24.K5018/table1?GETtext/xml+votable180.050000true272.61992-19.9288980.0055555555555555565/3498 3651 3661 3667 3672 3676 7654 6/1340 1470 1775 1785 1788 3005 3033-3034 3037-3039 3059 3071 3153 3160 3171-3172 3177-3179 3197 3230 3247 3273 3278-3279 3294 3297 3302-3303 3306 3310 3314-3315 3322 3595 3611 3614-3615 3621 3637 3639 3649 3654 3712 3723 3726 12970 13244-13245 13311 13990 13996-13997 14063 14203 14241 14270-14271 14280 14287 14305 14311 14313-14314 14321 14335 14354-14355 14455 14609 14611-14612 14614 14616 14618-14619 14621-14623 14625 14628-14630 14639-14640 14653-14655 14662-14663 14665-14667 14672-14674 14676 14678-14680 14682-14684 14686-14687 14692-14693 14696-14697 14700 14708-14709 14713 15360-15362 15364 15368 15370 15372 15374 15390 15392 15395 15401 15429 15452 15458 15473 15636 15645 15649 15669 15681 15683 15688 15692 21542 22028 22034 22040 22042 22045 22047 22070-22071 22088 22091 22106 22115 22122 22162 22165 22212 22214-22215 22262 22267 22271 23637 23639 23641 23644-23645 23669 23671 23764 23795 23810 23816 23842 23969 24189 24325 24499 24507 24554 29091 29097 29100 29103 29116 29118 29160 29461 29504 29510-29511 29522 29529 30213 30232 30245 30256 30262 30269 30312-30313 30315 30319 30328 30416 30419-30420 30422 30425 30527 30595 30597 30601 30623 30625 30637 30644 30648 30653 30691 30694-30695 30715 30719https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/24.K5018?format=asciiRadiodefaultJ/other/RAA/24.K5018/table1Properties of the identified ^13^CO structuresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/360] Serial No. of the cloud structuremeta.id;meta.mainintGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latVLSRCentroid velocitykm/sphys.veloc;pos.lsrdoubleVelDispVelocity dispersionkm/sphys.veloc.dispersiondoubleReffEffective radiuspcphys.size.radiusdoublee_ReffEffective radius uncertaintypcstat.errordoubleSIGMAmass surface densitysolMass.pc**-2phys.densitydoubleMLTEMass of the cloud structuresolMassphys.massdoubleVLSRA2Centroid velocity, derived in the N(H_2_) half-max isophotekm/sphys.veloc;pos.lsrdoubleVelDispA2Velocity dispersion, derived in the N(H_2_) half-max isophotekm/sphys.veloc.dispersiondoubleReffA2? Effective radius, derived in the N(H_2_) half-max isophotepcphys.size.radiusdoublenullablee_ReffA2? Effective radius uncertainty, derived in the N(H_2_) half-max isophotepcstat.errordoublenullableSIGMAA2Mass surface density, derived in the N(H_2_) half-max isophotesolMass.pc**-2phys.densitydoubleMLTEA2? Mass of the cloud structure, derived in the N(H_2_) half-max isophotesolMassphys.massdoublenullableDHeliocentric distancekpcpos.distance;pos.heliocentricdoublee_DHeliocentric distance uncertainty, lower valuekpcstat.errordoubleE_DHeliocentric distance uncertainty, upper valuekpcstat.error;stat.maxdoubleDNameName of the source for distance measurementmeta.idcharr_DReference of the source (1)meta.ref;pos.frameint_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.raindexed_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.decindexed