J/ApJ/680/349ivo://CDS.VizieR/J/ApJ/680/349doi:10.26093/cds/vizier.16800349CDSJackson J.M.Finn S.C.Rathborne J.M.Chambers E.T.Simon R.2018-01-30T07:17:50Z2010-10-25T09:23:40ZCDS support team

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

cds-question@unistra.frinfrared-sourcesCS(2-1) measurements toward a large sample of fourth Galactic quadrant infrared dark clouds (IRDCs) were made with the Australia Telescope National Facility Mopra telescope in order to establish their kinematic distances and Galactic distribution. Due to its large critical density, CS unambiguously separates the dense IRDCs from more diffuse giant molecular clouds. The fourth-quadrant IRDCs show a pronounced peak in their radial galactocentric distribution at R=6kpc. The first-quadrant IRDC distribution (traced by ^13^CO emission) also shows a peak, but at a galactocentric radius of R=5kpc rather than 6kpc. The reliability of the MSX IRDC catalog by Simon and coworkers is estimated by using the CS detection rate of IRDC candidates. The overall reliability is at least 58%, and increases to near 100% for high contrasts, Galactic longitudes within ~30{deg} of the Galactic center, and large mid-IR backgrounds. A significant fraction of our IRDC sample (14%) showed two CS velocity components, which probably represent two distinct IRDCs along the same line of sight.2008ApJ...680..349Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/680/349CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/313/641 : FAUST observations in 4th Galactic Quadrant (Brosch+, 2000)J/ApJ/653/1325 : Galactic distribution of infrared dark clouds (Simon+, 2006)J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)J/ApJ/706/727 : Distance and mass of Infrared Dark Clouds (Marshall+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/680/349https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/680/349http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/680/349https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/680/349https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/680/349http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/680/349GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/680/349/table1 (Fourth-quadrant IRDC cores detected in CS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/680/349/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/680/349/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/680/349/table1?GETtext/xml+votable180.050000true152.5275-57.00020.005555555555555556Cone search capability for table J/ApJ/680/349/table2 (Fourth-quadrant IRDC candidates not detected in CS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/680/349/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/680/349/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/680/349/table2?GETtext/xml+votable180.050000true156.2808-58.14580.0055555555555555565/7206 9482 9504 10453 10543 10556 10614 10615 10624 6/28803 28807 28808 28809 28812 28828 28830 37333 37335 37343 37366 37901 37902 37921 37923 37924 38024 38025 38026 41598 41599 41651 41653 41655 41657 41661 41671 41673 41675 41676 41678 41688 41696 41697 41766 41767 41768 41770 41772 41773 41776 41778 41780 41802 41803 41804 41806 41811 41817 41820 42155 42158 42159 42167 42169 42170 42171 42206 42207 42210 42211 42213 42214 42215 42216 42228 42229 42376 42378 42382 42383 42390 42391 42392 42393 42395 42396 42434 42435 42439 42440 42441 42450 42451 42455 42500 42501 43015 43018 43019 43024 43026https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/680/349?format=asciiInfrareddefaultJ/ApJ/680/349/table1Fourth-quadrant IRDC cores detected in CSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXDCIRDC candidate name (GLLL.ll+BB.bb)meta.id;meta.maincharm_MSXDC[abc] a to c core designation (G1)meta.code.multipcharGLONGalactic longitude coordinatedegpos.galactic.lonGLATGalactic latitude coordinatedegpos.galactic.latPeakPeak contrast (G2)phot.flux;arith.ratiofloatTA*pAntenna temperature peakKphot.antennaTemp;stat.maxfloatVelSystemic velocitykm/sphys.velocfloatW(CS)CS(2-1) line width (97.981GHz)km/sspect.line.widthfloatIntIntegrated CS line intensityK.km/sphot.flux.density;em.radiofloatRgal? Galactocentric radiuskpcpos.distance;pos.galactocentricfloatnullableDnear? Near kinematic distancekpcpos.distance;pos.galactocentricfloatnullableComp[Y] two velocity components?meta.codechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/680/349/table2Fourth-quadrant IRDC candidates not detected in CSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXDCCloud name (GLLL.ll+BB.bb)meta.id;meta.maincharm_MSXDC[ab] a to b core designation (G1)meta.code.multipcharGLONGalactic longitude coordinatedegpos.galactic.lonGLATGalactic latitude coordinatedegpos.galactic.latPeakPeak contrast (G2)phot.flux;arith.ratiofloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed