J/MNRAS/477/2220ivo://CDS.VizieR/J/MNRAS/477/2220doi:10.26093/cds/vizier.74772220CDSTraficante A.Duarte-Cabral A.Elia D.Fuller G.A.Merello M.,Molinari S.Peretto N.Schisano E.Di Giorgio A.2024-08-18T20:19:03Z2021-06-28T14:04:51ZCDS support team

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

cds-question@unistra.frstellar-associationsWe tested the validity of the three Larson relations in a sample of 213 massive clumps selected from the Herschel infrared Galactic Plane (Hi-GAL) survey, also using data from the Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey of 3-mm emission lines. The clumps are divided into five evolutionary stages so that we can also discuss the Larson relations as a function of evolution. We show that this ensemble does not follow the three Larson relations, regardless of the clump's evolutionary phase. A consequence of this breakdown is that the dependence of the virial parameter {alpha}_vir_ on mass (and radius) is only a function of the gravitational energy, independent of the kinetic energy of the system; thus, {alpha}_vir_ is not a good descriptor of clump dynamics. Our results suggest that clumps with clear signatures of infall motions are statistically indistinguishable from clumps with no such signatures. The observed non-thermal motions are not necessarily ascribed to turbulence acting to sustain the gravity, but they might be a result of the gravitational collapse at the clump scales. This seems to be particularly true for the most massive (M>=1000M_{sun}_) clumps in the sample, where exceptionally high magnetic fields might not be enough to stabilize the collapse.2018MNRAS.477.2220Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/2220CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/471/100 : Hi-GAL compact source catalog. -71.0<l<67.0 (Elia+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/477/2220https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/477/2220http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/477/2220https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/477/2220https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/477/2220http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/477/2220GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/477/2220/tableb1 (Properties of the 213 clumps analysed in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/2220/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/2220/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/2220/tableb1?GETtext/xml+votable180.050000true196.64042-62.564610.0055555555555555565/10453 10542 10556 6/41653 41655 41660 41671 41675-41678 41681-41684 41688 41759 41763 41766-41767 41770 41772 41778 41780 41782 41799 41802 41804-41806 41809 41811 41817 41820 41825 42159 42172-42174 42206-42207 42211 42215-42217 42228-42230 42378-42379 42381-42383 42387 42390 42392-42393 42397-42398 42435 42441 42444 42496-42497 42499-42500 42512https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/477/2220?format=asciidefaultJ/MNRAS/477/2220/tableb1Properties of the 213 clumps analysed in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameClump name (GLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latRadClump radius defined by the Cutex fit at 250umpcstat.weightfloatTClump temperature (1)Kphys.temperaturefloatMassClump mass (1)solMassphys.massintLClump luminosity (1)solLumphys.luminosityintSigmaClump surface densityg.cm**-2phot.flux.density.sbfloatsigmaClump velocity dispersion (2)km/sphys.veloc.dispersionfloatalphavirVirial parameterphys.mass;arith.ratiofloatEvolEvolution phase (3)meta.notechar_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