J/ApJ/949/46ivo://CDS.VizieR/J/ApJ/949/46doi:10.26093/cds/vizier/ba-xn-1eCDSHuang BoWang KeGirart J.M.Jiao W.He Q.Liang E.2026-07-02T11:59:15Z2025-07-22T13:44:20ZCDS support team

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

cds-question@unistra.frinterstellar-mediumco-line-emissionsurveysmagnetic-fieldsmolecular-cloudsgalaxy-kinematicsgalaxy-planesmilky-way-galaxyIn order to study the initial conditions of massive star formation, we have previously built a sample of 463 high-mass starless clumps (HMSCs) across the inner Galactic plane covered by multiple continuum surveys. Here, we use ^13^CO(2-1) line data from the SEDIGISM survey, which covers 78{deg} in longitude (-60{deg}<l<18{deg}, |b|<0.5{deg}) with 30" resolution, to investigate the global dynamical state of these parsec-scale HMSCs (207 sources with good-quality data, mass 10^2^-10^5^M_{sun}_, size 0.1-3.6pc). We find that most HMSCs are highly turbulent with a median Mach number M_S_~8.2, and 44%-55% of them are gravitationally bound (with virial parameter {alpha}_vir_<~2) if no magnetic fields are present. A median magnetic field strength of 0.33-0.37mG would be needed to support these bound clumps against collapse, in agreement with previous observations of magnetic fields in regions of massive star formation. Luminosity-to-mass ratio, an important tracer of evolutionary stage, is strongly correlated with dust temperature. Magnetic field strength is also correlated with density. The Larson line width-size scaling does not hold in HMSCs. This study advances our understanding of the global properties of HMSCs, and our high-resolution observations with the Atacama Large Millimeter/submillimeter Array are in progress to study the resolved properties.2023ApJ...949...46Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/949/46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)J/A+A/481/345 : SED evolution in massive YSOs (Molinari+, 2008)J/A+A/540/A113 : Starless clumps in ATLASGAL (Tackenberg+, 2012)J/A+A/544/A146 : ATLASGAL cold high-mass clumps with NH_3_ (Wienen+, 2012)J/ApJS/209/2 : The BGPS. X. Dense molecular gas (Shirley+, 2013)J/A+A/565/A75 : ATLASGAL: dust condensations in Gal. plane (Csengeri+, 2014)J/MNRAS/451/3089 : Young clumps embedded in IRDC (Traficante+, 2015)J/ApJ/822/59 : BGPS. XIV. Molecular cloud clumps GBT obs. (Svoboda+, 2016)J/MNRAS/471/100 : Hi-GAL compact source catalog. -71.0<l<67.0 (Elia+, 2017)J/ApJ/846/144 : Virial analysis of the dense cores in Orion A (Kirk+, 2017)J/A+A/601/A124 : Clouds in SEDIGISM field (Schuller+, 2017)J/ApJS/231/11 : High-mass starless clump cand. from ATLASGAL (Yuan+, 2017)J/MNRAS/477/2220 : Larson relations in massive clumps (Traficante+, 2018)J/MNRAS/473/1059 : Complete sample of Gal. clump properties (Urquhart+, 2018)J/MNRAS/500/3027 : The SEDIGISM survey: molecular clouds (Duarte-Cabral+, 2021)J/MNRAS/500/3064 : The SEDIGISM survey: First Data Release (Schuller+, 2021)J/A+A/658/A160 : SEDIGISM survey, search for molecular outflows (Yang+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/949/46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/949/46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/949/46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/949/46https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/949/46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/949/46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/949/46/table1 (Physical parameters of the 207 high-mass starless clump (HMSC) candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/46/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/46/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/46/table1?GETtext/xml+votable180.050000true266.2252917-28.80061110.0055555555555555565/10556 6/28808-28809 28824-28825 28827-28828 28830-28831 28874-28875 28897 28900 28912 28915 28919 29090-29091 29097 29101 29103 29115 30262 30268 41655 41767 41780 41812-41814 42159 42169 42171-42173 42175 42207 42214-42215 42217 42228 42378-42379 42396 42441 42444 42456-42457 42460-42461 42496https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/949/46?format=asciiRadiodefaultJ/ApJ/949/46/table1Physical parameters of the 207 high-mass starless clump (HMSC) candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource Name (GLLL.llll+B.bbbb)meta.id;meta.maincharY17Display data from Yuan+ 2017, J/ApJS/231/11meta.ref.urlintnullableVLSR[-118/152] Centroid velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.01/1] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatDV[0.9/34.6] Line widthkm/sspect.line.widthfloate_DV[0.03/4.8] Uncertainty in DVkm/sstat.error;spect.line.widthfloatsigma-v[0.37/14.7] Total velocity dispersionkm/sphys.veloc.dispersionfloatsigma-th[0.05/0.1] Thermal term velocity dispersionkm/sphys.veloc.dispersionfloatsigma-nth[0.36/14.7] Non-thermal term velocity dispersionkm/sphys.veloc.dispersionfloatM[1.74/62.1] Mach numberphys.veloc;arith.difffloatMvir[87/410000] Virial masssolMassphys.massfloataVir[0.04/161.1] Virial parameter, {alpha}_vir_phys.mass;arith.ratiofloatB[0.08/2.9]? Required B-field to support against the collapsemGphys.magFieldfloatnullableZ20Display data from Zhang+ 2020, J/A+A/637/A40meta.ref.urlintnullableAGALDisplay data from Csengeri+ 2014, J/A+A/565/A75meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Yuan+ 2017, J/ApJS/231/11 or from Names (for 2 sources not in Y17) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Yuan+ 2017, J/ApJS/231/11 or from Names (for 2 sources not in Y17) (declination part)degpos.eq.dec;meta.main