J/ApJS/261/37ivo://CDS.VizieR/J/ApJS/261/37doi:10.26093/cds/vizier.22610037CDSYuan L.Yang J.Du F.Su Y.Liu X.Zhang S.Sun Y.Zhou X.,Yan Q.-Z.Ma Y.2022-11-16T05:58:50Z2022-11-09T10:11:39ZCDS support team

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

cds-question@unistra.frmolecular-cloudsco-line-emissioninterstellar-mediumsurveysAfter morphological classification of 18190 ^12^CO molecular clouds, we further investigate the properties of their internal molecular gas structures traced by the ^13^CO (J=1-0) line emissions. Using three different methods to extract the ^13^CO gas structures within each ^12^CO cloud, we find that ~15% of the ^12^CO clouds (2851) have ^13^CO gas structures and these ^12^CO clouds contribute about 93% of the total integrated flux of ^12^CO emission. In each of the 2851 ^12^CO clouds with ^13^CO gas structures, the ^13^CO emission area generally does not exceed 70% of the ^12^CO emission area, and the ^13^CO integrated flux does not exceed 20% of the ^12^CO integrated flux. We reveal a strong correlation between the velocity-integrated intensities of ^12^CO lines and those of ^13^CO lines in both ^12^CO and ^13^CO emission regions. This indicates the H2 column densities of molecular clouds are crucial for the ^13^CO line emission. After linking the ^13^CO structure detection rates of the 18190 ^12^CO molecular clouds to their morphologies, i.e., nonfilaments and filaments, we find that the ^13^CO gas structures are primarily detected in ^12^CO clouds with filamentary morphologies. Moreover, these filaments tend to harbor more than one ^13^CO structure. That demonstrates filaments not only have larger spatial scales, but also have more molecular gas structures traced by ^13^CO lines, i.e., local gas density enhancements. Our results favor the turbulent compression scenario for filament formation, in which dynamical compression of turbulent flows induces local density enhancements. The nonfilaments tend to be in the low-pressure and quiescent turbulent environments of the diffuse interstellar medium.2022ApJS..261...37Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/261/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/592/A54 : Combined ArTeMiS+SPIRE 350um image of NGC6334 (Andre+, 2016)J/A+A/600/A141 : Orion A integral shaped filament image (Kainulainen+, 2017)J/ApJ/858/90 : Radial profiles of 5 nearby galaxies (Gallagher+, 2018)J/A+A/631/A72 : SABOCA 350um view of ATLASGAL massive clumps (Lin+, 2019)J/A+A/638/A44 : Infrared dark cloud G28.3 HI and CI maps (Beuther+, 2020)J/A+A/646/A170 : Serpens filament ^13^CO, C18O and C17O datacubes (Gong+, 2021)J/A+A/645/A27 : Orion B in 18 molecular tracers maps (Gratier+, 2021)J/ApJS/257/51 : Morphologies of MWISP ^12^CO mol. clouds (Yuan+, 2021)J/A+A/660/A56 : NGC 6334 maps and CO velocity cubes (Arzoumanian+, 2022)J/A+A/663/A56 : SEDIGISM: Molecular Cloud morphology I. (Neralwar+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/261/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/261/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/261/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/261/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/261/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/261/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/261/37/table2 (A catalog of ^12^CO/^13^CO line emission parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/261/37/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/261/37/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/261/37/table2?GETtext/xml+votable180.050000true334.8137759.686830.0055555555555555564/190-191 197 199 206 228 232 893-895 980 5/446-447 490-491 751 758-759 793-795 807 814-815 817-822 828 834 840 899 901-904 908-910 922 932 936-938 3550-3551 3559 3565 3567 3569-3571 3909-3911 3916 3924-3925 6/1773-1775 1778-1779 1782-1783 1954-1955 2933 2938-2941 2943 2999 3002-3003 3015 3021 3023 3025-3029 3031 3133 3135 3137 3140-3142 3147-3150 3168-3169 3171 3223 3245 3247 3250-3251 3253-3254 3264-3265 3267 3292-3294 3316-3318 3320-3322 3324 3326 3328-3330 3332 3334 3340 3342 3366 3368 3370-3371 3456-3458 3464 3466 3588 3590 3593 3595 3601-3603 3620-3621 3623 3626-3627 3629-3631 3644-3646 3664-3665 3672 3674 3680 3682-3684 3686 3692 3732-3733 3735-3736 3738-3739 3756 3760 3762 3776-3777 14187-14188 14190-14191 14194 14198-14199 14230 14233 14235 14257 14259 14265 14267 14273-14274 15632-15633 15635 15668-15670 15704-15705 15712-15713 15716https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/261/37?format=asciiRadiodefaultJ/ApJS/261/37/table2A catalog of ^12^CO/^13^CO line emission parametersID[674/627890] Identifier numbermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (GLLL.lll+BB.bbb-VLSR)meta.id;meta.maincharGLON[104.79/150.2] Galactic longitude, ^12^CO intensity-weighted average center (1)degpos.galactic.lonGLAT[-5.11/5.3] Galactic latitude, ^12^CO intensity-weighted average center (1)degpos.galactic.latVLSR[-93.6/9] ^12^CO intensity-weighted average central (LSR) velocity (2)km/sem.wl.central;spect.line;stat.meanfloat_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.decnullableindexedVspan12CO[0.8/43.5] Velocity span of ^12^CO(1-0) (3)km/sphys.velocfloatArea12CO[2/60746] Angular area, ^12^CO (1-0)arcmin**2phys.angAreadoubleTpk12CO[2.4/51] Peak value of ^12^CO (1-0)Kphys.temperaturefloatFlux12CO[3/390097] Integrated flux of ^12^CO(1-0) line emission (4)K.km.s**-1.arcmin**-2phot.flux.density;em.line.COdoubleArea13CO[1.2/13881] Angular area, ^13^CO(1-0)arcmin**2phys.angAreadoubleVspan13CO[0.5/37.4] Velocity span of ^13^CO(1-0) (3)km/sphys.velocfloatTpk13CO[0.6/16] Peak value of ^13^CO (1-0)Kphys.temperaturefloatFlux13CO[0.3/39385] Integrated flux of ^13^CO(1-0) line emission (4)K.km.s**-1.arcmin**-2phot.flux.density;em.line.COdouble