J/ApJS/152/81ivo://CDS.VizieR/J/ApJS/152/81doi:10.26093/cds/vizier.21520081CDSPark Y.-S.Lee C.W.Myers P.C.2017-12-22T05:33:28Z2010-10-07T13:45:12ZCDS support team

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

cds-question@unistra.frinterstellar-mediumsurveysradio-astronomyA CO survey is undertaken toward about 80% of the starless cores in the Lee & Myers catalog that can be observed in the northern hemisphere to investigate their general observational properties such as line width and intensity, from which one can deduce their environmental physical conditions. The peak ^12^CO intensity implies a kinetic temperature close to 10K, as is already known, but for some of the cores the kinetic temperature is much higher than 10K, suggesting either that they are not really starless or that they are externally heated. We derive the ratios of peak intensities and line widths for the pairs of ^12^CO and ^13^CO lines and find a value of ~1.7 for both. The linear correlations between them are most likely to be due to clumpy structure. These data are also compared with data sets of CS 2-1 and N_2_H^+^ 1-0 lines tracing high-density regions. It is found that the peak intensity and line width of ^13^CO are roughly correlated with those of CS, suggesting that the outer envelope is kinematically related to the inner dense core. Confirming that the ^12^CO lines seldom exhibit deep self-reversal features, whereas this is not unusual for the CS lines, we propose a heuristic model where the outer part is clumpy, but the inner part has a rather smooth density profile, with a uniform temperature and mean density decreasing outward. We apply three-dimensional radiative transfer calculations to this simple model, demonstrating that the essential observational features of the starless cores are successfully reproduced.2004ApJS..152...81Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/152/81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/123/233 : Catalog of Optically selected cores (Lee+, 1999)J/ApJ/526/788 : Survey of infall motions toward starless cores (Lee+, 1999)J/ApJS/153/523 : Infall motions toward starless cores. III. (Lee+, 2004)J/ApJ/664/928 : Starless cores in HCN(J=1-0) (Sohn+ 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/152/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/152/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/152/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/152/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/152/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/152/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/152/81/table1 (Line parameters of 178 starless cores)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/152/81/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/152/81/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/152/81/table1?GETtext/xml+votable180.050000true0.847567.3130560.0055555555555555566/1031 1039 1048 1050 1052 1054 1067 1068 1074 1075 1080 1114 1115 1117 1126 1129 1136 1170 1290 1542 1937 1959 1968 3038 3755 3849 3898 13997 14002 14199 14270 14317 14319 14333 14350 14351 14369 14371 14663 14686 14708 14710 15408 15411 15476 15478 15541 15543 15556 15582 15590 15643 15649 15851 15964 15965 16129 16197 16198 22205 22829 23549 23560 23561 23739 23970 24300 24305 24515 29112 29347 29350 29354 29362 29366 29367 29374 29375 29560 29562 29597 29646 29657 29661 29668 29682 30234 30344 30346 30349 30355 30621 30623 30666 30743 30748 30792 30793 30798 30820 31257 31263 32011 32068 32092 42970 42981 42992https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/152/81?format=asciiRadiodefaultJ/ApJS/152/81/table1Line parameters of 178 starless coresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[LM99]Source namemeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.main12CO-T? The ^12^CO temperature (115.271GHz)Kphot.antennaTempfloatnullablef_12CO-T[*] Flag on 12CO-T (1)meta.codechar12CO-DelV? The ^12^CO line widthkm/sspect.line.width;em.line.COfloatnullable13CO-TThe ^13^CO temperature (110.201GHz)Kphot.antennaTempfloat13CO-DelVThe ^13^CO line widthkm/sspect.line.width;em.line.COfloat13CO-FIntegrated ^13^CO line fluxK.km/sphot.flux;em.line.CO;spect.linefloat1999CatData from optically selected cores catalog, Lee and Myers, 1999, Cat. J/ApJS/123/233meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar