J/ApJS/212/2ivo://CDS.VizieR/J/ApJS/212/2doi:10.26093/cds/vizier.22120002CDSGarcia P.Bronfman L.Nyman L.-A.Dame T.M.Luna A.2017-10-16T11:01:10Z2014-06-26T12:56:38ZCDS support team

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

cds-question@unistra.frmolecular-cloudsmilky-way-galaxyinfrared-sourcesh-ii-regionsThe Columbia University-Universidad de Chile CO Survey of the southern Milky Way is used to separate the CO(1-0) emission of the fourth Galactic quadrant within the solar circle into its dominant components, giant molecular clouds (GMCs). After the subtraction of an axisymmetric model of the CO background emission in the inner southern Galaxy, 92 GMCs are identified, and for 87 of them the twofold distance ambiguity is solved. Their total molecular mass is M(H_2_)=1.14+/-0.05x10^8^M_{sun}_, accounting for around 40% of the molecular mass estimated from an axisymmetric analysis of the H_2_ volume density in the Galactic disk, M(H_2_)_disk_=3.03x10^8^M_{sun}_. The large-scale spiral structure in the southern Galaxy, within the solar circle, is traced by the GMCs in our catalog; three spiral arm segments, the Centaurus, Norma, and 3 kpc expanding arm, are analyzed. After fitting a logarithmic spiral arm model to the arms, tangent directions at 310{deg}, 330{deg}, and 338{deg}, respectively, are found, consistent with previous values from the literature. A complete CS(2-1) survey toward IRAS point-like sources with far-IR colors characteristic of ultracompact H II regions is used to estimate the massive star formation rate per unit H_2_ mass (MSFR) and the massive star formation efficiency ({epsilon}) for GMCs. The average MSFR for GMCs is 0.41+/-0.06L_{sun}_/M_{sun}_, and for the most massive clouds in the Norma arm it is 0.58+/-0.09L_{sun}_/M_{sun}_. Massive star formation efficiencies of GMCs are, on average, 3% of their available molecular mass.2014ApJS..212....2Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/212/2CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/216 : H-alpha emission regions in Southern Milky Way (Rodgers+ 1960)J/MNRAS/437/1791 : RMS survey: molecular observations (Urquhart+, 2014)J/MNRAS/420/1656 : RMS compact HII regions distances (Urquhart+, 2012)J/ApJ/699/1153 : Kinematic dist. to GRS molecular clouds (Roman-Duval+, 2009)J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/MNRAS/366/1096 : Kinematic distance ambiguity (Busfield+, 2006)J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997)J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)J/A+A/171/261 : RRLs of Southern HII Regions (Caswell+ 1987)J/ApJS/63/821 : Inner Galaxy Molecular clouds & cloud cores (Scoville+, 1987)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/212/2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/212/2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/212/2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/212/2https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/212/2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/212/2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/212/2/gmc (Giant molecular clouds in the fourth Galactic quadrant, within solar circle with their peak antenna temperature and molecular mass (tables 2 and 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/212/2/gmc?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/212/2/gmc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/212/2/gmc?GETtext/xml+votable180.050000true191.13436-62.110940.0055555555555555565/10599 10624 6/41599 41653 41655 41675 41676 41678 41682 41683 41684 41696 41704 41759 41767 41770 41772 41777 41778 41780 41802 41804 41806 41812 41813 41814 41820 41824 42159 42170 42172 42173 42174 42203 42207 42212 42213 42215 42224 42225 42226 42228 42229 42230 42376 42378 42379 42381 42382 42383 42387 42390 42391 42392 42393 42440 42502 43026https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/212/2?format=asciiInfrareddefaultJ/ApJS/212/2/gmcGiant molecular clouds in the fourth Galactic quadrant, within solar circle with their peak antenna temperature and molecular mass (tables 2 and 5)Seq[1/92] Cloud running sequence numbermeta.id;meta.mainintprimaryGLON[302.1/347.3] Galactic longitude (1)degpos.galactic.lonGLAT[-1.3/1.3] Galactic latitude (1)degpos.galactic.latVlsr[-129.3/-7.8] LSR velocitykm/sphys.veloc;pos.lsrfloatf_Vlsr[*] Flag on Vlsr (2)meta.codecharDV[4/18.4] Line width ({Delta}V(FWHM)) of the GMC composite spectrumkm/sspect.line.widthfloatD[1.8/12.5]? Heliocentric kinematic distance (3)kpcpos.distance;pos.heliocentricfloatnullablen_DAdopted distance (N=near, F=far, and T=tangent)meta.notecharf_DMethod(s) used for the distance estimation (4)meta.codecharR[16/131]? Linear radius (5)pcphys.size.radiusintnullableMvir[4.9/6.9]? Log virial mass (3)log(solMass)phys.massfloatnullableM(H2)[4.9/7]? Log molecular mass M(H_2_) (3)log(solMass)phys.massfloatnullableTp(MSD)[0.1/8.5] Model subtracted data (MSD) peak temperature (K{Delta}l{Delta}b) (6)Kphot.antennaTempfloatMH2(MSD)[4.5/6.7]? MSD molecular mass M(H_2_) (6)log(solMass)phys.massfloatnullableTp(GMC)[0.2/17.6] GMC peak temperature (K{Delta}l{Delta}b)Kphot.antennaTempfloatMH2(GMC)[4.9/7]? GMC molecular mass M(H_2_)log(solMass)phys.massfloatnullableN[1/14] Number of UC HII associated with the cloudmeta.numberintnullableFiras[254/218249] Total FIR flux F_IRAS_ of the massive-star-forming regions associated with the GMC (7)solLum.kpc**-2phys.luminosity;em.IRintnullableLiras[3.24/6.81]? log FIR luminosity (L_FIR_=F_IRAS_D^2^; log(L/L_{sun}_))log(solLum)phys.luminosity;em.IRfloatnullableSFE[0/10.7]? Massive star formation efficiency (8)%stat.paramfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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