J/MNRAS/483/4291ivo://CDS.VizieR/J/MNRAS/483/4291doi:10.26093/cds/vizier.74834291CDSColombo D.Rosolowsky E.Duarte-Cabral A.Ginsburg A.Glenn J.,Zetterlund E.Hernandez A.K.Dempsey J.Currie M.J.2025-07-18T20:16:49Z2022-08-11T13:11:59ZCDS support team

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

cds-question@unistra.frinterstellar-mediummolecular-cloudsmilky-way-galaxyWe define the molecular cloud properties of the Milky Way first quadrant using data from the JCMT CO(3-2) High-Resolution Survey. We apply the Spectral Clustering for Interstellar Molecular Emission Segmentation (SCIMES) algorithm to extract objects from the full-resolution data set, creating the first catalogue of molecular clouds with a large dynamic range in spatial scale. We identify more than 85000 clouds with two clear sub-samples: ~35500 well-resolved objects and ~540 clouds with well-defined distance estimations. Only 35 per cent of the catalogued clouds (as well as the total flux encompassed by them) appear enclosed within the Milky Way spiral arms. The scaling relationships between clouds with known distances are comparable to the characteristics of the clouds identified in previous surveys. However, these relations between integrated properties, especially from the full catalogue, show a large intrinsic scatter (~0.5dex), comparable to other cloud catalogues of the Milky Way and nearby galaxies. The mass distribution of molecular clouds follows a truncated-power-law relationship over three orders of magnitude in mass with a form dN/dM{alpha}M^-1.7^ with a clearly defined truncation at an upper mass of M_0_~3x10^6^M_{sun}_, consistent with theoretical models of cloud formation controlled by stellar feedback and shear. Similarly, the cloud population shows a power-law distribution of size with dN/dR{alpha}R^-2.8^ with a truncation at R_0_=70pc.2019MNRAS.483.4291Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/4291CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/4291https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/4291http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/4291https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/4291https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/4291http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/4291GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/483/4291/table1 (Contents of the COHRS cloud catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/4291/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/4291/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/4291/table1?GETtext/xml+votable180.050000true293.74319.2630.0055555555555555565/7275 7278 7376 7383 7564 7578 7605 7672 7679 6/12968 12970 14336 29091 29094 29096-29097 29118-29119 29162 29457 29460-29461 29508 29510-29511 29517 29522-29523 29528-29529 30216 30218-30219 30222 30240-30241 30244-30245 30247 30262-30263 30268-30269 30316 30318-30319 30330 30405 30416-30417 30419 30594-30595 30598 30600-30601 30604-30605 30607 30616 30618-30619 30622-30623 30641 30644-30645 30692 30694-30695 30701 30706-30707 30712-30713 30715https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/483/4291?format=asciidefaultJ/MNRAS/483/4291/table1Contents of the COHRS cloud catalogueBType[0/3] Broadcast type, distance quality (10)meta.codefloatBinaccBroadcast inaccuracypixmeta.code.errorfloatRadEffective radius (2)pcphys.size.radiusfloate_adcpix? Error on adcpixpixstat.errorfloatnullablee_bdcpix? Error on bdcpixpixstat.errorfloatnullablee_aexpix? Error on aexpixpixstat.errorfloatnullablee_bexpix? Error on bexpixpixstat.errorfloatnullablee_aexdcpix? Error on aexdcpixpixstat.errorfloatnullablee_bexdcpix? Error on bexdcpixpixstat.errorfloatnullablee_aas? Error on aasarcsecstat.errorfloatnullablee_bas? Error on basarcsecstat.errorfloatnullablee_adcas? Error on adcasarcsecstat.errorfloatnullablee_bdcas? Error on bdcasarcsecstat.errorfloatnullablee_aexas? Error on aexasarcsecstat.errorfloatnullablee_bexas? Error on bexasarcsecstat.errorfloatnullablee_aexdcas? Error on aexdcasarcsecstat.errorfloatnullablee_bexdcas? Error on bexdcasarcsecstat.errorfloatnullablee_DistError on Distpcstat.errorfloate_Rad? Error on Radpcstat.errorfloatnullablee_sigv? Error on sigvkm/sstat.errorfloatnullablee_LCOError on LCOK.km.pc**2.s**-1stat.errordoublee_MlumError on MlumsolMassstat.errordoublee_Mvir? Error on MvirsolMassstat.errordoublenullablee_scalpar? Error on scalparkm**2.s**-2.pc**-1stat.errorfloatnullablee_lCO? Error on lCOK.km/sstat.errordoublenullablee_NH2? Error on NH2cm**-2stat.error;phys.columnDensitydoublenullablee_surfdens? Error on surfdenssolMass.pc**-2stat.errorfloatnullablee_Volume? Error on volumepc**2.km.s**-1stat.error;phys.volumedoublenullablee_alpha? Error on alphastat.error;pos.eq.rafloatnullablee_Raddc? Error on Raddcpcstat.errorfloatnullablee_sigvdc? Error on sigvdckm/sstat.errorfloatnullablee_Mvirdc? Error on MvirdcsolMassstat.errordoublenullablee_scalpardc? Error on scalpardckm**2.s**-2.pc**-1stat.errorfloatnullablee_lCOdc? Error on lCOdcK.km/sstat.errordoublenullablee_surfdensdc? Error on surfdensdcsolMass.pc**-2stat.errorfloatnullablee_volumedc? Error on volumedcpc**2.km.s**-1stat.errordoublenullablee_alphadc? Error on alphadcstat.errorfloatnullablee_Radex? Error on Radexpcstat.errorfloatnullablee_sigvex? Error on sigvexkm/sstat.errorfloatnullablee_LCOex? Error on LCOexK.km.pc**2.s**-1stat.errordoublenullablee_Mlumex? Error on MlumexsolMassstat.errordoublenullablee_Mvirex? Error on MvirexsolMassstat.errordoublenullablee_scalparex? Error on sclaparexkm**2.s**-2.pc**-1stat.errorfloatnullablee_lCOex? Error on lCOexK.km/sstat.errordoublenullablee_NH2ex? Error on NH2excm**-2stat.errordoublenullablee_surfdensex? Error on surfdensexsolMass.pc**-2stat.errordoublenullablee_volumeex? Error on volumeexpc**2.km.s**-1stat.errordoublenullablee_alphaex? Error on alphaexstat.errorfloatnullablee_Radexdc? Error on Radexdcpcstat.errorfloatnullablee_sigvexdc? Error on sigvexdckm/sstat.errorfloatnullablee_Mvirexdc? Error on MvirexdcsolMassstat.errordoublenullablee_scalparexdc? Error on scalparexdckm**2.s**-2.pc**-1stat.errorfloatnullablee_lCOexdc? Error on lCOexdcK.km/sstat.errordoublenullablee_NH2exdc? Error on NH2exdccm**-2stat.errordoublenullablee_surfdensexdc? Error on surfdensexdcsolMass.pc**-2stat.errordoublenullablee_volumeexdc? Error on volumeexdcpc**2.km.s**-1stat.errordoublenullablee_alphaexdc? Error on alphaexdcstat.errordoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCloud identification numbermeta.id;meta.mainintDSStructure number within the dendrogrammeta.idintFileSub-cube assignment file namemeta.id;meta.filecharxcenCentroid position along the sub-cube x-axispixpos.cartesian.x;instr.detfloatycenCentroid position along the sub-cube y-axispixpos.cartesian.y;instr.detfloatvcenCentroid position along the sub-cube velocitypixphys.velocfloatGLONMean Galactic longitudedegpos.galactic.lonindexedGLATMean Galactic latitudedegpos.galactic.latindexedvLSRMean velocity with respect to the local standard of restkm/sphys.veloc;pos.lsr;stat.meanfloatXsunHeliocentric coordinate Xpcpos.cartesian.x;pos.heliocentricdoubleYsunHeliocentric coordinate Ypcpos.cartesian.y;pos.heliocentricfloatZsunHeliocentric coordinate Zpcpos.cartesian.z;pos.heliocentricfloatXgalGalactocentric coordinate Xpcpos.cartesian.x;pos.galactocentricdoubleYgalGalactocentric coordinate Ypcpos.cartesian.y;pos.galactocentricdoubleZgalGalactocentric coordinate Zpcpos.cartesian.z;pos.galactocentricfloatapixUncorrected major semi-axis size (in pix)pixphys.angSize;srcfloatbpixUncorrected minor semi-axis size (in pix)pixphys.angSizefloatadcpixDeconvolved major semi-axis size (in pix)pixphys.angSize;srcfloatbdcpixDeconvolved minor semi-axis size (in pix)pixphys.angSize;srcfloataexpix? Extrapolated major semi-axis size (in pix)pixphys.angSize;srcfloatnullablebexpix? Extrapolated minor semi-axis size (in pix)pixphys.angSizefloatnullableaexdcpixExtrapolated and deconvolved major semi-axis size (in pix)pixphys.angSize;srcfloatbexdcpixExtrapolated and deconvolved minor semi-axis size (in pix)pixphys.angSize;srcfloataasUncorrected major semi-axis size (in arcsec)arcsecphys.angSize;srcfloatbdcas? Deconvolved minor semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullableaexas? Extrapolated major semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullablebexas? Extrapolated minor semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullableaexdcas? Extrapolated and deconvolved major semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullablebexdcas? Extrapolated and deconvolved minor semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullablePA[] Position angle with respect to the cube x-axisdegpos.posAngfloatFCOIntegrated fluxKphot.fluxdoubleFCOex? Extrapolated FCOKphot.fluxdoublenullableAexactpixArea defined as projected total number of pixels (in pix)pixphys.angSizedoubleAellipsepixArea of the ellipse from a,b (in pix) (1)pixphys.angSizedoubleAexactasArea defined as projected total number of pixels (in arcsec2)arcsec**2phys.angSizedoubleAellipseasArea of the ellipse from a,b (in arcsec^2^) (1)arcsec**2phys.angSizedoubleTpeakPeak brightess temperature within the cloudKphys.temperaturefloatTmeanMean brightess temperature within the cloudKphys.temperaturefloatSNRpeakPeak signal-to-noise within the cloudstat.snr;stat.maxfloatSNRmeanMean signal-to-noise within the cloudstat.snrfloatDistObject distancepcpos.distancedoublesigvVelocity dispersionkm/sphys.veloc.dispersionfloatLCOCO luminosity (3)K.km.pc**2.s**-1phys.luminosity;em.radiodoubleMlumMass from the CO luminositysolMassphys.massdoubleMvirMass from the virial theorem (4)solMassphys.massdoublescalparScaling parameter (5)km**2.s**-2.pc**-1arith.factorfloatlCOIntegrated CO luminosityK.km/sphys.luminosity;em.radiofloatNH2H2 column densitycm**-2phys.columnDensitydoublesurfdensSurface densitysolMass.pc**-2phys.densityfloatVolumeVolume (6)pc**2.km.s**-1meta.bib.volumedoublealphaVirial parameter (7)phys.mass;arith.ratiofloatRaddcDeconvolved effective radiuspcphys.size.radiusfloatsigvdcDeconvolved velocity dispersionkm/sphys.veloc.dispersionfloatMvirdcDeconvolved virial masssolMassphys.massdoublescalpardcDeconvolved scaling parameterkm**2.s**-2.pc**-1arith.factorfloatlCOdcDeconcolved integrated CO luminosityK.km/sphys.luminosity;em.radiofloatNH2dcDeconvolved NH2 column densitycm**-2phys.columnDensitydoublesurfdensdcDeconvolved surface densitysolMass.pc**-2phys.densityfloatvolumedcDeconvolved volumepc**2.km.s**-1phys.volumedoublealphadcDeconvolved virial parameterphys.mass;arith.ratiofloatRadex? Extrapolated effective radiuspcphys.size.radiusfloatnullablesigvex? Extrapolated velocity dispersionkm/sphys.veloc.dispersionfloatnullableLCOex? Extrapolated CO luminosityK.km.pc**2.s**-1phys.luminosity;em.radiodoublenullableMlumex? Extrapolated mass from the CO luminositysolMassphys.massdoublenullableMvirex? Extrapolated virial masssolMassphys.massdoublenullablescalparex? Extrapolated scaling parameterkm**2.s**-2.pc**-1arith.factorfloatnullablelCOex? Extrapolated integrated CO luminosityK.km/sphys.luminosity;em.radiofloatnullableNH2ex? Extrapolated NH2 column densitycm**-2phys.columnDensitydoublenullablesurfdensex? Extrapolated surface densitysolMass.pc**-2phys.densityfloatnullablevolumeex? Extrapolated volumepc**2.km.s**-1phys.volumedoublenullablealphaex? Extrapolated virial parameterphys.mass;arith.ratiofloatnullableRadexdcExtrapolated and deconvolved effective radiuspcphys.size.radiusfloatsigvexdc? Extrapolated and deconvolved velocity dispersionkm/sphys.veloc.dispersionfloatnullablelCOexdc? Extrapolated and deconvolved integrated CO luminosityK.km/sphys.luminosity;em.radiofloatnullableNH2exdc? Extrapolated and deconvolved NH2 column densitycm**-2phys.columnDensitydoublenullablesurfdensexdc? Extrapolated and deconvolved surface densitysolMass.pc**-2phys.densitydoublenullablevolumeexdc? Extrapolated and deconvolved volumepc**2.km.s**-1phys.volumedoublenullablealphaexdc? Extrapolated and deconvolved virial parameterphys.mass;arith.ratiofloatnullableNpixNumber of pixel within the cloudmeta.numberintNleavesNumber of leaves within the cloudmeta.numberintedgeThe cloud is on the cube lower or upper bordermeta.codefloatparentCloud parental structure IDmeta.id.parentintancestorCloud parental structure ID at the bottom of the hierarchymeta.id.parentintStrucTypeStructure type (8)src.morph.typecharDistArmDistance to the associated spiral armpcpos.distancefloatArmSpiral arm associated with the cloud (9)meta.idchare_XsunError on Xsunpcstat.errorfloate_YsunError on Ysunpcstat.errorfloate_Zsun[] Error on Zsunpcstat.errorfloate_XgalError on Xgalpcstat.errorfloate_YgalError on Ygalpcstat.errorfloate_Zgal[] Error on Zgalpcstat.error;pos.distance;pos.cartesian.zfloate_apix? Error on apixpixstat.errorfloatnullablee_bpix? Error on bpixpixstat.errorfloatnullable_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.decnullableindexedbasUncorrected minor semi-axis size (in arcsec)arcsecphys.angSize;srcfloatadcas? Deconvolved major semi-axis size (in arcsec)arcsecphys.angSize;srcfloatnullableMvirexdc? Extrapolated and deconvolved virial masssolMassphys.massdoublenullablescalparexdc? Extrapolated and deconvolved scaling parameterkm**2.s**-2.pc**-1arith.factorfloatnullablee_NH2dc? Error on NH2dccm**-2stat.errordoublenullable