J/A+A/540/A113ivo://CDS.VizieR/J/A+A/540/A113doi:10.26093/cds/vizier.35400113CDSTackenberg J.Beuther H.Henning T.Schuller F.Wienen M.Motte F.,Wyrowski F.Bontemps S.Bronfman L.Menten K.Testi L.Lefloch B.2017-12-22T05:32:53Z2012-04-06T12:28:25ZCDS support team

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

cds-question@unistra.frmolecular-cloudsUnderstanding massive star formation requires comprehensive knowledge about the initial conditions of this process. The cradles of massive stars are believed to be located in dense and massive molecular clumps. In this study, we present an unbiased sample of the earliest stages of massive star formation across 20deg^2^ of the sky. Within the region 10{deg}<l<20{deg} and |b|<1{deg}, we search the ATLASGAL survey at 870um for dense gas condensations. These clumps are carefully examined for indications of ongoing star formation using YSOs from the GLIMPSE source catalog as well as sources in the 24um MIPSGAL images, to search for starless clumps. We calculate the column densities as well as the kinematic distances and masses for sources where the v_lsr_ is known from spectroscopic observations. Within the given region, we identify 210 starless clumps with peak column densities >10^23^cm^-2^. In particular, we identify potential starless clumps on the other side of the Galaxy. The sizes of the clumps range between 0.1pc and 3pc with masses between a few tens of M_{sun}_ up to several ten thousands of M_{sun}_.2012A&A...540A.113Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/540/A113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/540/A113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/540/A113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/540/A113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/540/A113https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/540/A113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/540/A113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/540/A113/table3 (Properties of starless clumps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/540/A113/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/540/A113/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/540/A113/table3?GETtext/xml+votable180.050000true272.5993-19.93820.0055555555555555565/7275 7278 7376-7377 6/29090-29091 29095 29097 29099 29116 29118-29119 29162 29461 294632.283270615984385e-22 2.283270615984385e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/540/A113?format=asciidefaultJ/A+A/540/A113/table3Properties of starless clumpsf_VNH3[0/1] 1 = direct NH3 observation (1)meta.codeintDnear? Kinematic near distance (4)kpcpos.distance;pos.heliocentricfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDGlobal identifiermeta.id;meta.mainintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainFpeakPeak flux at 870umJyphot.flux.density;em.mm.200-400GHzfloatRadCLUMPFIND effective radiusarcsecphys.angSizeintFintIntegrated flux over clump at 870um (Jy/beam)Jyphot.flux.density;em.mm.200-400GHzfloatVNH3? NH3 velocity (1)km/sspect.dopplerVelocfloatnullableVHCO+? HCO+ velocity (2)km/sspect.dopplerVelocfloatnullablef_VHCO+[0/1] 1 = HCO+ observation (2)meta.codeintDfar? Kinematic far distance (4)kpcpos.distance;pos.heliocentricfloatnullableNHpeakPeak column density (5)1e+23cm**-2phys.columnDensity;stat.maxfloatMnear? Mass calculated using the near distancesolMassphys.massintnullableMfar? Mass calculated using the far distancesolMassphys.massintnullablef_Mfar[0/1] 1 = use of near distancemeta.codeintSimbadSimbad column added by the CDSmeta.ref.urlchar