J/PASJ/51/791ivo://CDS.VizieR/J/PASJ/51/791doi:10.26093/cds/vizier/bj-1k-rqCDSYamaguchi R.Saito H.Mizuno N.Mine Y.Mizuno A.Ogawa H.Fukui Y.2026-03-17T20:04:00Z2006-01-12T09:02:16ZCDS support team

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

cds-question@unistra.frh-ii-regionsmolecular-cloudsinfrared-sourcesWe have carried out extensive ^13^CO(J=1-0) observations toward 23 southern H II regions associated with bright-rimmed clouds. In total, 95 molecular clouds have been identified to be associated with the H II regions. Among the 95, 57 clouds are found to be associated with 204 IRAS point sources which are candidates for young stellar objects. There is a significant increase of star-formation efficiency on the side facing to the H II regions; the luminosity-to-mass ratio, defined as the ratio of the stellar luminosity to the molecular cloud mass, is higher by an order of magnitude on the near side of the H II regions than that on the. far side. This indicates that molecular gas facing to the H II regions is more actively forming massive stars whose luminosity is ~>10^3^L_{sun}_. In addition, the number density of the IRAS point sources increases by a factor of 2 on the near side of the H II regions compared with on the far side. These results strongly suggest that the active formation of massive stars on the near side of the H II regions is due to the effects of the H II regions, such as the compression of molecular material by the ionization/shock fronts. For the whole Galaxy, we estimate that the present star-formation rate under such effects is at least 0.2-0.4M_{sun}_/yr, corresponding to a few 10% by mass.1999PASJ...51..791Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/51/791CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/20 : Catalogue of HII Regions (Sharpless 1959)J/A+A/284/233 : Association of HII regions & IRAS PSC sources (Codella+ 1994)J/A+AS/133/29 : Molecular line survey towards UC HII (Hatchell+ 1998)J/A+AS/131/319 : HII regions catalogue (Petit+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/51/791https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/51/791http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/51/791https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/51/791https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/51/791http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/51/791GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/51/791/clouds (Properties of ^13^CO clouds)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/51/791/clouds?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/51/791/clouds?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/51/791/clouds?GETtext/xml+votable180.050000true112.738845-18.9302610.0055555555555555565/9820 10628 6/20805 21504 28817 28819 28888 28890-28892 28894 37817 37819 37850-37851 37872 37891 37894 37896-37897 37932 37938 39133 39163 39257-39259 39329 39331 39398 40618-40619 41598-41599 41661 41696 41698 41813 42187 42190 42212-42213 42407 42516 42518 42520https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/51/791?format=asciiInfrareddefaultJ/PASJ/51/791/table1Observed H II regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIIHII regionobs.fieldcharprimarySizeSize (NN or NNNxNNN) in arcmin (1)arcminphys.angSizecharStarExciting starmeta.id.assocn_Star[+] +: the earliest star probably contributing to ionizationmeta.notecharSpTypeMK spectral typesrc.spTypecharDist? Distancekpcpos.distance;pos.heliocentricfloatnullabler_DistReferences for distance and exciting star (2), in refs.dat filemeta.ref;pos.framecharRelObjRelated objectsmeta.id.parentcharJ/PASJ/51/791/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCOdeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/PASJ/51/791/cloudsProperties of ^13^CO cloudstau? Optical depthphys.absorption.opticalDepthfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[YSM99][1-95] Sequential numbermeta.recordintprimaryCloudCloud namemeta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainTR*Peak antenna temperature (1)Kphot.antennaTempfloatDVFWHM line width (1)km/sspect.line.widthfloatVlsrLSR velocity (1)km/sphys.veloc;pos.lsrfloatIntVelocity-integrated intensity (1)K.km/sphot.flux.density;em.mm.100-200GHzfloatN(H2)H_2_ column density1e+21cm**-2phys.columnDensityfloatDVc? FWHM line width computed from gaussian fitkm/sspect.line.widthfloatnullableDist? Distance to the molecular cloudkpcpos.distance;pos.heliocentricfloatnullableRad? Size of the molecular cloudpcphys.size.radiusfloatnullableMass? Molecular cloud masssolMassphys.massintnullableHIIAssociated HII regionsmeta.id.parentcharprimaryIPS? Number of cold IRAS points sources listed in table4meta.numberintnullable_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/PASJ/51/791/table4Associated IRAS point sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[YSM99][1-95] Sequential numbermeta.recordintIRASAssociated IRAS point sourcemeta.id.assoccharm_IRAS[A] Multiplicity index on IRAS namemeta.code.multipchar