J/ApJ/651/L125ivo://CDS.VizieR/J/ApJ/651/L125doi:10.26093/cds/vizier.16519125CDSWang Y.Zhang Q.Rathborne J.M.Jackson J.Wu Y.2017-11-10T11:16:24Z2008-10-30T13:22:04ZCDS support team

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

cds-question@unistra.frmolecular-cloudsastrophysical-masersradio-astronomyWe present a survey of the 6_16_-5_23_ H_2_O maser transition toward a sample of 140 compact cores in infrared dark clouds using the Very Large Array. Strong (>1Jy) H_2_O maser emission was found associated with 17 cores, indicative of star formation in these cores. We infer that the cores with H2O masers have embedded protostars. Cores associated with maser emission have masses of 12 to 2x10^3^M_{sun}_, similar to the mass range in the entire sample. The H_2_O maser detection rate (12%) toward the compact, cold cores is much lower than that toward high-mass protostellar objects and ultracompact H ii regions. The detection rate of H_2_O masers is significantly higher for higher mass cores than for lower mass cores. We suggest that some of the most massive infrared dark cloud cores without H_2_O maser emission are at an evolutionary stage earlier than the protostellar phases. They are prime candidates for high-mass starless cores.2006ApJ...651L.125Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/651/L125CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)J/ApJ/641/389 : Properties of IRDC cores (Rathborne+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/651/L125https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/651/L125http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/651/L125https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/651/L125https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/651/L125http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/651/L125GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/651/L125/table1 (Properties of the MSXDC cores and water maser emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/651/L125/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/651/L125/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/651/L125/table1?GETtext/xml+votable180.050000true274.46-15.8938890.0055555555555555566/29118 29508 29510 29529 29532 29533 29535 30218 30245 30256 30258 30262 30263 30312 30315 30318 30319 30330 30417 30421 30692 30716https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/651/L125?format=asciiRadiodefaultJ/ApJ/651/L125/table1Properties of the MSXDC cores and water maser emissionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXDCInfrared Dark Cloud identification, GLLL.ll-BB.bbbmeta.id.parentcharCoreCompact core identification, MMNN (1)meta.id;meta.maincharRAJ2000Compact core Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Compact core Degree of Declination (J2000)pos.eq.dec;meta.mainP1.2CCompact core 1.2mm peak fluxmJyphot.flux.density;em.mm.200-400GHzintI1.2CCompact core 1.2mm Integrated fluxJyphot.flux.density;em.mm.200-400GHzfloatVLSRCCloud local standard of rest velocitykm/sphys.veloc;pos.lsrfloatRAM? Water Maser Hour of Right Ascension (J2000)pos.eq.ranullableDEM? Water Maser Degree of Declination (J2000)pos.eq.decnullableP1.2W? Water Maser Peak flux (2)Jyphot.flux.density;em.mm.200-400GHzfloatnullableVelW? Water Maser velocitykm/sphys.velocfloatnullableTVelMTotal Water Maser velocity rangekm/sinstr.bandwidthcharIRDCDisplay the data from Rathborne et al. 2006, Cat. J/ApJ/641/389meta.ref.urlcharSimbadSimbad column added by the CDSchar