J/A+A/601/A124ivo://CDS.VizieR/J/A+A/601/A124doi:10.26093/cds/vizier.36010124CDSSchuller F.Csengeri T.Urquhart J.S.Duarte-Cabral A.Barnes P.J.,Giannetti A.Hernandez A.K.Leurini S.Mattern M.Medina S.-N.X.,Agurto C.Azagra F.Anderson L.D.Beltran M.T.Beuther H.Bontemps S.,Bronfman L.Dobbs C.L.Dumke M.Finger R.Ginsburg A.Gonzalez E.,Henning T.Kauffmann J.Mac-Auliffe F.Menten K.M.,Montenegro-Montes F.M.Moore T.J.T.Muller E.Parra R.,Perez-Beaupuits J.-P.Pettitt A.Russeil D.Sanchez-Monge A.,Schilke P.Schisano E.Suri S.Testi L.Torstensson K.Venegas P.,Wang K.Wienen M.Wyrowski F.Zavagno A.2019-05-02T09:44:47Z2017-05-17T07:44:50ZCDS support team

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

cds-question@unistra.frsurveysmilky-way-galaxymolecular-cloudsinterstellar-mediumradio-astronomyThe origin and life-cycle of molecular clouds are still poorly constrained, despite their importance for understanding the evolution of the interstellar medium. Many large-scale surveys of the Galactic plane have been conducted recently, allowing for rapid progress in this field. Nevertheless, a sub-arcminute resolution global view of the large-scale distribution of molecular gas, from the diffuse medium to dense clouds and clumps, and of their relationship to the spiral structure, is still missing. We have carried out a systematic, homogeneous, spectroscopic survey of the inner Galactic plane, in order to complement the many continuum Galactic surveys available with crucial distance and gas-kinematic information. Our aim is to combine this data set with recent infrared to sub-millimetre surveys at similar angular resolutions. The SEDIGISM survey covers 78deg^2^ of the inner Galaxy (-60{deg}<l<+18{deg}, |b|<0.5{deg}) in the J=2-1 rotational transition of ^13^CO. This isotopologue of CO is less abundant than ^12^CO by factors up to 100. Therefore, its emission has low to moderate optical depths, and higher critical density, making it an ideal tracer of the cold, dense interstellar medium. The data have been observed with the SHFI single-pixel instrument at APEX. The observational setup covers the ^13^CO(2-1) and C^18^O(2-1) lines, plus several transitions from other molecules. The observations have been completed. Data reduction is in progress and the final data products will be made available in the near future. Here we give a detailed description of the survey and the dedicated data reduction pipeline. To illustrate the scientific potential of this survey, preliminary results based on a science demonstration field covering -20{deg}<l<-18.5{deg} are presented. Analysis of the ^13^CO(2-1) data in this field reveals compact clumps, diffuse clouds, and filamentary structures at a range of heliocentric distances. By combining our data with data in the (1-0) transition of CO isotopologues from the ThrUMMS survey, we are able to compute a 3D realization of the excitation temperature and optical depth in the interstellar medium. Ultimately, this survey will provide a detailed, global view of the inner Galactic interstellar medium at an unprecedented angular resolution of ~30".2017A&A...601A.124Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/601/A124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/212/2 : Giant molecular clouds in the 4th Galactic quadrantJ/MNRAS/443/1555 : ATLASGAL massive star forming clumps sample (Urquhart+ 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/601/A124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/601/A124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/601/A124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/601/A124https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/601/A124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/601/A124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/601/A124/table5 (Properties of the ATLASGAL compact clumps located in the SEDIGISM science demonstration field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/601/A124/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/601/A124/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/601/A124/table5?GETtext/xml+votable180.050000true252.0579511-45.36268830.005555555555555556Cone search capability for table J/A+A/601/A124/tablea1 (Properties of molecular clouds and complexes extracted with SCIMES from the SEDIGISM science demonstration field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/601/A124/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/601/A124/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/601/A124/tablea1?GETtext/xml+votable180.050000true252.1547458-44.64500910.0055555555555555566/42207 42229 42378-42379 42400https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/601/A124?format=asciiRadiodefaultJ/A+A/601/A124/table5Properties of the ATLASGAL compact clumps located in the SEDIGISM science demonstration fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCSCATLASGAL Compact Source Catalog name, LLL.lll+BB.bbbmeta.id;meta.maincharVlsr? Centroid velocitykm/sphys.veloc;pos.lsrfloatnullablesigma? Velocity dispersion (^13^CO(201) FWHM line-width)km/sspect.line.width;em.line.COfloatnullableDist? Adopted distancekpcpos.distance;pos.heliocentricfloatnullableMdust? Clump mass, derived from the integrated 870um flux density100solMassphys.massfloatnullableMvir? Virial mass100solMassphys.massfloatnullableIDcloud? ID number of associated SCIMES cloud in tablea1.datmeta.idintnullableGMCGMC name of associated ^12^CO cloud from Garcia et al. (2014, Cat. J/ApJS/212/2)meta.idcharMSFflagMassive star formation associations (Urquhart et al., 2014, Cat. J/MNRAS/443/1555) (1)meta.idcharComplexName of associated ATLASGAL complex, GLLL.lll+BB.bbbmeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from AGAL name (right ascension part)degpos.eq.ra;meta.main_DEPosition from AGAL name (declination part)degpos.eq.dec;meta.mainJ/A+A/601/A124/tablea1Properties of molecular clouds and complexes extracted with SCIMES from the SEDIGISM science demonstration fieldIDCloud number in cataloguemeta.idintSdensMass surface densitysolMass.pc**-2phys.densityintf_Dist[0/4] Distance flag (1)meta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCloud name (SDGLLL.lll+B.bbb)meta.id;meta.maincharaaxisIntensity weighted semi-major axisarcsecphys.angSize;srcintbaxisIntensity weighted semi-minor axisarcsecphys.angSize.sminAxisintPA[] Position angle of semi_major axisdegpos.posAngintARAspect ratiosrc.morph.paramfloatVlsrCentroid velocitykm/sphys.veloc;pos.lsrfloatsigmaVelocity dispersionkm/sphys.veloc.dispersionfloat<WCO>Average integrated intensityK.km/sphot.flux.density;em.radio;stat.meanfloatNlNumber of dendrogram leavesmeta.numberintDistAdopted distancekpcpos.distance;pos.heliocentricfloate_DistUncertainty on distancekpcstat.errorfloatAreaExact area of cloud on skypc**2phys.area;obs.fieldintRadEquivalent radiuspcphys.size.radiusfloatlmaxProjected lengthpcpos.distancefloatMassTotal mass1000solMassphys.massfloatalphaVirVirial parameterphys.mass;arith.ratiofloattedge[0/1] Edge Flag: 1 if a cloud is touching the image edge, 0 otherwisemeta.codeint_GlonPosition from SDG name (longitude part)degpos.galactic.lon_GlatPosition from SDG name (latitude part)degpos.galactic.lat_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