J/ApJ/756/60ivo://CDS.VizieR/J/ApJ/756/60doi:10.26093/cds/vizier.17560060CDSSanhueza P.Jackson J.M.Foster J.B.Garay G.Silva A.Finn S.C.2017-06-01T08:52:28Z2014-05-07T07:26:39ZCDS support team

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

cds-question@unistra.frchemical-abundancesmillimeter-astronomysubmillimeter-astronomymolecular-cloudsinterstellar-mediumWe have observed 37 Infrared Dark Clouds (IRDCs), containing a total of 159 clumps, in high-density molecular tracers at 3mm using the 22m ATNF Mopra Telescope located in Australia. After determining kinematic distances, we eliminated clumps that are not located in IRDCs and clumps with a separation between them of less than one Mopra beam. Our final sample consists of 92 IRDC clumps. The most commonly detected molecular lines are (detection rates higher than 8%) N_2_H^+^, HNC, HN^13^C, HCO^+^, H^13^CO^+^, HCN, C_2_H, HC_3_N, HNCO, and SiO. We investigate the behavior of the different molecular tracers and look for chemical variations as a function of an evolutionary sequence based on Spitzer IRAC and MIPS emission. Optical depth calculations show that in IRDC clumps the N_2_H^+^ line is optically thin, the C_2_ H line is moderately optically thick, and HNC and HCO^+^ are optically thick.2012ApJ...756...60Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/60CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/530/A118 : G29.96-0.02 and G35.20-1.74 1mm and 3mm maps (Pillai+, 2011)J/A+A/527/A88 : Chemistry in infrared dark clouds (Vasyunina+, 2011)J/ApJS/197/25 : MALT90 pilot survey (Foster+, 2011)J/ApJ/715/310 : Early stages of star formation in IRDCs (Rathborne+, 2010)J/ApJ/710/150 : Molecular lines in EGOs (Chen+, 2010)J/A+A/515/A42 : Catalog of high extinction clouds (Rygl+, 2010)J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)J/MNRAS/399/1506 : IRDC cores in SCUBA Legacy Catalogue (Parsons+, 2009)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJ/680/349 : Galactic distribution of IRDCs (Jackson+, 2008)J/PAZh/33/143 : Laboratory studies of HNCO (Lapinov+, 2007)J/ApJ/653/1325 : Galactic distribution of infrared dark clouds (Simon+, 2006)J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)J/ApJ/651/L125 : Water masers associated with IR dark cloud cores (Wang+, 2006)J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)J/A+A/432/369 : Leiden Atomic and Molecular Database (LAMDA) (Schoeier+, 2005)J/A+A/426/97 : SIMBA survey. 1.2-mm/IRAS sources (Faundez+, 2004)J/A+A/361/1079 : HNCO in massive galactic dense cores (Zinchenko, 2000)J/A+A/321/293 : SiO production in interstellar shocks (Schilke+ 1997)J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/60https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/756/60/table2 (Clump properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/60/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/60/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/60/table2?GETtext/xml+votable180.050000true274.46-15.8938890.0055555555555555566/29118 29508 29510 29529 29533 29535 30218 30245 30256 30258 30262 30263 30312 30315 30318 30319 30330 30417 30421 30692 307161.6553710550405622e-22 1.6553710550405622e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/756/60?format=asciiRadiodefaultJ/ApJ/756/60/table2Clump propertiesASimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXDCIRDC Name (GLLL.ll+BB.bb)meta.id.parentcharClumpClump identifier (<[RJS2006] MSXDC GLLL.ll+DD.dd MMNN> in Simbad)meta.id.part;meta.maincharMolDisplay the molecular line Gaussian parameters observed for this clump (table 3)meta.ref.urlcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainVlsr[2.6/119.2] LSR velocity from the N_2_H^+^ JF_1_F=123->012 transitionkm/sphys.veloc;pos.lsrfloatf_Vlsr[cd] Note on the Vlsr origin (1)meta.codecharDist[0.5/7.8] Distancekpcpos.distance;pos.heliocentricfloatf_Dist[cd] Note on the Dist origin (1)meta.codecharTdust[16/52]? Dust temperatureKphys.temperaturefloatnullableClSpitzer classification (2)meta.code.classcharCommComment (3)meta.notecharR10Display the data from Rathborne+, 2010, Cat. J/ApJ/715/310, for this clumpmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/756/60/table3Molecular line Gaussian parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXDCIRDC name (GLLL.ll+BB.bb)meta.id.parentcharClumpClump identifier (MMNN)meta.id.part;meta.maincharMolMolecule identifiermeta.idrmsThe rms noiseKstat.stdev;instr.det.noisefloatTA? Antenna temperatureKphot.antennaTempfloatnullablee_TA? Uncertainty in TAKstat.errorfloatnullableVlsr? Local standard of rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_Vlsr? Uncertainty in Vlsrkm/sstat.error;phys.veloc;pos.lsrfloatnullableDelV? Line widthkm/sspect.line.widthfloatnullablee_DelV? Uncertainty in DelVkm/sstat.errorfloatnullableJ/ApJ/756/60/abundIRDC clumps optical depths, column densities, continuum emission parameters and molecular abundancesMSXDCFull name of the dark cloudmeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIRDCtIRDC truncated name (GLLL.ll)meta.id.parentcharClumpClump identifier (MMNN)meta.id.part;meta.maincharMolDisplay the molecular line Gaussian parameters observed for this clump (table 3)meta.ref.urlchartauN[0.04/5]? N_2_H^+^ optical depthphys.absorption.opticalDepthfloatnullabletauHC[7/75]? HCO^+^ optical depthphys.absorption.opticalDepthfloatnullabletauHN[4.5/74]? HNC optical depthphys.absorption.opticalDepthfloatnullabletauC[0.2/6]? C_2_H optical depthphys.absorption.opticalDepthfloatnullableNN2H[0.3/14]? N_2_H^+^ column density1e+13cm**-2phys.columnDensityfloatnullablee_NN2H[0.08/6.2]? NN2H uncertainty1e+13cm**-2stat.errorfloatnullableNHCO[0.5/10.1]? HCO^+^ column density1e+14cm**-2phys.columnDensityfloatnullablee_NHCO[0.1/7]? NHCO uncertainty1e+14cm**-2stat.errorfloatnullableNHNC[0.5/14]? HNC column density1e+14cm**-2phys.columnDensityfloatnullablee_NHNC[0.2/4]? NHNC uncertainty1e+14cm**-2stat.errorfloatnullableNC2H[0.6/8]? C_2_H column density1e+14cm**-2phys.columnDensityfloatnullablee_NC2H[0.2/7]? NC2H uncertainty1e+14cm**-2stat.errorfloatnullableNHC3N[0.1/3.4]? HC_3_N column density1e+13cm**-2phys.columnDensityfloatnullablee_NHC3N[0.1/0.3]? NHC3N uncertainty1e+13cm**-2stat.errorfloatnullableNHNCO[0.9/10]? HNCO column density1e+13cm**-2phys.columnDensityfloatnullablee_NHNCO[0.5/1.5]? NHNCO uncertainty1e+13cm**-2stat.errorfloatnullableNSiO[1/35]? SiO column density1e+12cm**-2phys.columnDensityfloatnullablee_NSiO[0.7/2.1]? NSiO uncertainty1e+12cm**-2stat.errorfloatnullableF1.2mm[14/548] 1.2mm flux in mJy/beammJyphot.flux.density;em.mm.200-400GHzintN(H2)[0.1/6] H_2_ column density1e+22cm**-2phys.columnDensityfloatN2H[0.1/17]? N_2_H^+^ abundancephys.abundfloatnullablee_N2H[0.02/17]? N2H uncertaintystat.errorfloatnullableHCO[0.3/28]? HCO^+^ abundancephys.abundfloatnullablee_HCO[0.09/15]? HCO uncertaintystat.errorfloatnullableHNC[0.5/19]? HNC abundancephys.abundfloatnullablee_HNC[0.1/11]? HNC uncertaintystat.errorfloatnullableC2H[0.7/16.2]? C_2_H abundancephys.abundfloatnullablee_C2H[0.2/26.1]? C2H uncertaintystat.errorfloatnullableHC3N[1.4/13.8]? HC_3_N abundancephys.abundfloatnullablee_HC3N[0.3/3.6]? HC3N uncertaintystat.errorfloatnullableHNCO[0.2/8.1]? HNCO abundancephys.abundfloatnullablee_HNCO[0.1/2]? HNCO uncertaintystat.errorfloatnullableSiO[2.7/9.2]? SiO abundancephys.abundfloatnullablee_SiO[0.3/4.5]? SiO uncertaintystat.errorfloatnullable