J/MNRAS/498/385ivo://CDS.VizieR/J/MNRAS/498/385doi:10.26093/cds/vizier/bg-fj-c1CDSJeffreson S.M.R.Kruijssen J.M.D.Keller B.W.Chevance M.Glover S.C.O.2026-08-03T07:30:11Z2023-11-03T08:00:11ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumgalaxy-kinematicsastronomical-modelsvisible-astronomyWe examine the role of the large-scale galactic-dynamical environment in setting the properties of giant molecular clouds in Milky Way-like galaxies. We perform three high-resolution simulations of Milky Way-like discs with the moving-mesh hydrodynamics code AREPO, yielding a statistical sample of ~80000 giant molecular clouds and ~55000 HI clouds. We account for the self-gravity of the gas, momentum, and thermal energy injection from supernovae and HII regions, mass injection from stellar winds, and the non-equilibrium chemistry of hydrogen, carbon, and oxygen. By varying the external gravitational potential, we probe galactic-dynamical environments spanning an order of magnitude in the orbital angular velocity, gravitational stability, mid-plane pressure, and the gradient of the galactic rotation curve. The simulated molecular clouds are highly overdense (~100x) and overpressured (~25x) relative to the ambient interstellar medium. Their gravoturbulent and star-forming properties are decoupled from the dynamics of the galactic mid-plane, so that the kpc-scale star formation rate surface density is related only to the number of molecular clouds per unit area of the galactic mid-plane. Despite this, the clouds display clear, statistically significant correlations of their rotational properties with the rates of galactic shearing and gravitational free-fall. We find that galactic rotation and gravitational instability can influence their elongation, angular momenta, and tangential velocity dispersions. The lower pressures and densities of the HI clouds allow for a greater range of significant dynamical correlations, mirroring the rotational properties of the molecular clouds, while also displaying a coupling of their gravitational and turbulent properties to the galactic-dynamical environment.2020MNRAS.498..385Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/498/385CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/498/385https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/498/385http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/498/385https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/498/385https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/498/385http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/498/385GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/498/385/gmcsCatalog of the physical properties and galactic-dynamical parameters of all GMCs presented in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxy model (FLAT, SLOPED or CORED)meta.id;meta.maincharRGalactocentic radiuskpcphys.size.radiusdoublebetaShear parameter (G1)stat.paramdoubleQToomre Q parameter (G2)stat.paramdoubleOmegaGalactic orbital angular velocityrad/Myrphys.veloc.angdoublephiPGas/stellar contribution to the mid-plane hydrostatic pressure (G3)stat.paramdoublePmpMid-plane pressurek.K.cm**-3phys.pressuredoubleMassCloud masssolMassphys.massdoubleleffCloud size (diameter)pcphys.angSizedoubleSigmaCloud surface density (G4)solMass.pc**-2phot.flux.density.sbdoublesigmaCloud velocity dispersion (G5)km/sphys.veloc.dispersiondoublealphavirCloud virial parameter (G6)stat.paramdoublePturbCloud turbulent pressure (G7)phys.pressuredoublevdivCloud velocity divergence (G8)km/sphys.veloc;arith.diffdoubleepsilonCloud aspect ratio (G9)phys.size.axisRatiodoubleLCloud specific angular momentum (G10)pc.km/sphys.angMomentumdoubleBsigmaCloud velocity anisotropy (G11)stat.paramdoubleSigmaSFRPer-cloud star formation rate surface density, averaged over the last 5MyrsolMass.kpc**-2.yr**-1phys.SFRdoubleJ/MNRAS/498/385/h1cloudsCatalog of the physical properties and galactic-dynamical parameters of all HI clouds presented in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxy model (FLAT, SLOPED or CORED)meta.id;meta.maincharRGalactocentic radiuskpcphys.size.radiusdoublebetaShear parameter (G1)stat.paramdoubleQToomre Q parameter (G2)stat.paramdoubleOmegaGalactic orbital angular velocityrad/Myrphys.veloc.angdoublephiPGas/stellar contribution to the mid-plane hydrostatic pressure (G3)stat.paramdoublePmpMid-plane pressurek.K.cm**-3phys.pressuredoubleMassCloud masssolMassphys.massdoubleleffCloud size (diameter)pcphys.angSizedoubleSigmaCloud surface density (G4)solMass.pc**-2phot.flux.density.sbdoublesigmaCloud velocity dispersion (G5)km/sphys.veloc.dispersiondoublealphavirCloud virial parameter (G6)stat.paramdoublePturbCloud turbulent pressure (G7)phys.pressuredoublevdivCloud velocity divergence (G8)km/sphys.veloc;arith.diffdoubleepsilonCloud aspect ratio (G9)phys.size.axisRatiodoubleLCloud specific angular momentum (G10)pc.km/sphys.angMomentumdoubleBsigmaCloud velocity anisotropy (G11)stat.paramdouble