J/ApJS/252/1ivo://CDS.VizieR/J/ApJS/252/1doi:10.26093/cds/vizier.22520001CDSTang N.Li DiYue N.Zuo P.Liu T.Luo G.Chen L.Qin S.-L.Wu Y.,Heiles C.2021-07-05T12:19:26Z2021-05-27T07:36:00ZCDS support team

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

cds-question@unistra.frmolecular-cloudsh-i-line-emissionmolecular-physicsWe have conducted a OH 18cm survey toward 141 molecular clouds in various environments, including 33 optical dark clouds, 98 Planck Galactic cold clumps (PGCCs), and 10 Spitzer dark clouds with the Arecibo telescope. The deviations from local thermal equilibrium are common for intensity ratios of both OH main lines and satellite lines. Line intensity of OH 1667MHz is found to correlate linearly with visual extinction A_V_ when A_V_ is less than 3mag. It was converted into OH column density by adopting the excitation temperature derived from Monte Carlo simulations with 1{sigma} uncertainty. The relationship between OH abundance X(OH) relative to H_2_ and A_V_ is found to follow an empirical formula, X(OH)/10^-7^=1.3_-0.4_^+0.4^+6.3_-0.5_^+0.5^*exp(-A_V_/2.9_-0.6_^+0.6^). Linear correlation is found between OH and ^13^CO intensity. Besides, nonthermal velocity dispersions of OH and ^13^CO are closely correlated. These results imply tight chemical evolution and spatial occupation between OH and ^13^CO. No obvious correlation is found between column density and nonthermal velocity dispersion of OH and HI narrow self-absorption (HINSA), indicating different chemical evolution and spatial volume occupation between OH and HINSA. Using the age information of HINSA analysis, OH abundance X(OH) is found to increase linearly with cloud age, which is consistent with previous simulations. Fourteen OH components without corresponding CO emission were detected, implying the effectiveness of OH in tracing the "CO-dark" molecular gas.2021ApJS..252....1Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/252/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/383/631 : Catalogue of dust clouds in the Galaxy (Dutra+, 2002)J/A+A/414/235 : OH maser emission from star forming regions (Szymczak+, 2004)J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)J/ApJ/756/76 : Planck cold dust clumps CO survey (Wu+, 2012)J/ApJS/209/37 : Planck cold clumps in ^12^CO, ^13^CO and C^18^O (Meng+, 2013)J/A+A/580/A112 : THOR. The HI, OH, Recombination Line Survey (Bihr+, 2015)J/A+A/590/A72 : Herschel counterparts of SDC (Peretto+, 2016)J/A+A/594/A28 : Planck Catalogue of Galactic cold clumps (PGCC) (Planck+, 2016)J/ApJS/224/43 : Planck cold clumps and cores in the 2nd quadrant (Zhang+, 2016)J/ApJS/234/2 : The GALFA-HI survey data release 2 (Peek+, 2018)J/ApJ/883/158 : Dark molecular gas in the Galaxy II. Perseus arm (Busch+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/252/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/252/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/252/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/252/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/252/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/252/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/252/1/table2 (Gaussian fitting parameters of OH data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/252/1/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/252/1/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/252/1/table2?GETtext/xml+votable180.050000true273.675567.077240.005555555555555556Cone search capability for table J/ApJS/252/1/table3 (Gaussian fitting parameters of HI narrow self-absorption (HINSA) data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/252/1/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/252/1/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/252/1/table3?GETtext/xml+votable180.050000true281.877253.218030.0055555555555555566/343 349 351 835 858 859 1031 1036 1037 1039 1048 1050 1052 1054 1060 1061 1066 1074 1077 1080 1091 1111 1117 1123 1126 1129 1138 1145 1154 1159 1167 1168 1170 1188 1241 1288 1290 12902 12960 12985 12991 13033 13048 14347 14350 14369 14371 14372 14594 14595 14601 23005 23646 23739 23810 23970 24300 24302 24305 24307 24308 24353 24378 24424 24425 24427 24450 24474 24478 24487 24493 24501 24515 24522 24555 30301 30313 30315 30316 30317 30318 30413 30421 30427 30455 30500 30508 30519 30537 30538 30561 30574 30575 30584 30608 30611 30616 30621 30663 30692 31818 32011 32039 32083https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/252/1?format=asciiRadiodefaultJ/ApJS/252/1/table2Gaussian fitting parameters of OH datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/141] Source index identifiermeta.idintm_Seq[0/4] Component numbermeta.code.multipintNameCommon identifiermeta.id;meta.maincharprimaryHIDisplay the HI data for this cloud (link to Table 3)meta.ref.urlintnullableGLON[33.10/201.85] Galactic longitudedegpos.galactic.lonGLAT[-24.9/11.4] Galactic latitudedegpos.galactic.latTp1665[-1.5/2.6]? OH 1665MHz line peak temperatureKspect.line.intensity;em.radio.1500-3000MHz;stat.maxfloatnullablee_Tp1665[0.01/1.1]? Uncertainty in Tp1665Kstat.errorfloatnullableVc1665[-20.5/110.2]? OH 1665MHz line center velocitykm/sspect.dopplerVelocfloatnullablee_Vc1665[0.01/1.1]? Uncertainty in Vc1665km/sstat.errorfloatnullableDV1665[0.2/9.1]? OH 1665MHz line widthkm/sspect.line.widthfloatnullablee_DV1665[0.01/2.5]? Uncertainty in DV1665km/sstat.errorfloatnullableTp1667[-1.6/4.4]? OH 1667MHz line peak temperatureKspect.line.intensity;em.radio.1500-3000MHz;stat.maxfloatnullablee_Tp1667[0.01/0.3]? Uncertainty in Tp1667Kstat.errorfloatnullableVc1667[-22.7/106.3]? OH 1667MHz line center velocitykm/sspect.dopplerVelocfloatnullablee_Vc1667[0/0.9]? Uncertainty in Vc1667km/sstat.errorfloatnullableDV1667[0.3/12.7]? OH 1667MHz line widthkm/sspect.line.widthfloatnullablee_DV1667[0.01/2.1]? Uncertainty in DV1667km/sstat.errorfloatnullableN(OH)[0.2/76.2]? OH column density1e+14cm**-2phys.columnDensityfloatnullablee_N(OH)[0.1/5.4]? Uncertainty in N(OH)1e+14cm**-2stat.errorfloatnullableTk[3.7/20.3]? Kinetic temperatureKphys.temperaturefloatnullablee_Tk[0.06/1.2]? Uncertainty in TkKstat.errorfloatnullableN(13CO)[0/102.3]? ^13^CO column density1e+15cm**-2phys.columnDensityfloatnullablee_N(13CO)[0/14]? Uncertainty in N(13CO)1e+15cm**-2stat.errorfloatnullableN(H2)[0.18/54]? H_2_ column density1e+21cm**-1phys.columnDensityfloatnullablee_N(H2)[0.02/17.2]? Uncertainty in N(H2)1e+21cm**-1stat.errorfloatnullableSimbadNameSimbad column added by the CDSmeta.idchar_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.decnullableindexedJ/ApJS/252/1/table3Gaussian fitting parameters of HI narrow self-absorption (HINSA) datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[2/141] Source index identifiermeta.idintNameCommon identifiermeta.id;meta.maincharNcNumber of components for this cloud (link to OH data in Table 2)meta.numberintnullableGLON[33.10/201.85] Galactic longitudedegpos.galactic.lonGLAT[-21.9/9.2] Galactic latitudedegpos.galactic.latN(OH)[1.1/42.2] OH column density1e+14cm**-2phys.columnDensityfloate_N(OH)[0.14/5.4] Uncertainty in N(OH)1e+14cm**-2stat.errorfloatN(HINSA)[0.2/14.8] H I Narrow Self-Absorption column density1e+18cm**-2phys.columnDensityfloate_N(HINSA)[0.07/9.2] Uncertainty in N(HINSA)1e+18cm**-2stat.errorfloatp[0.38/0.98] Fraction of backgroundinstr.backgroundfloatDen[0.2/18.5]? Density1000cm**-3phys.densityfloatnullablee_Den[0.1/17.1]? Uncertainty in Den1000cm**-3stat.errorfloatnullableN(H2)[0.3/18.7] H_2_ column density1e+21cm**-2phys.columnDensityfloate_N(H2)[0.04/17.2] Uncertainty in N(H2)1e+21cm**-2stat.errorfloatSCatDisplay data from Dutra+, 2002, J/A+A/383/631, Planck+, 2016, J/A+A/594/A28, Peretto+, 2009, J/A+A/505/405, Wu+, 2012, J/ApJ/756/76 and Peek+, 2018, J/ApJS/234/2 within 3'meta.ref.urlintnullable_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