J/A+A/486/191ivo://CDS.VizieR/J/A+A/486/191doi:10.26093/cds/vizier.34860191CDSPandian J.D.Momjian E.Goldsmith P.F.2008-12-16T18:14:38Z2008-12-16T19:10:11ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomyradial-velocitystellar-distanceDistances to most star forming regions are determined using kinematics, through the assumption that the observed radial velocity arises from the motion of the source with respect to the Sun resulting from the differential rotation of Galaxy. The primary challenge associated with the application of this technique in the inner Galaxy is the kinematic distance ambiguity. In this work, we aim to resolve the kinematic distance ambiguity towards a sample of 6.7GHz methanol masers, which are signposts of the early stages of massive star formation. We measured 21cm HI absorption spectra using the Very Large Array in C and CnB configurations. A comparison of the maximum velocity of HI absorption with the source velocity and tangent point velocity was used to resolve the kinematic distance ambiguity.2008A&A...486..191Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/486/191CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+AS/134/115 : Medicina 6.7GHz methanol masers survey (Slysh+ 1999)J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)J/A+A/403/1095 : 6.7GHz methanol masers survey of low-mass YSO (Minier+, 2003)J/other/ChJAA/3.49 : Velocity and distance of methanol maser sources (Xu+ 2003)J/A+A/432/737 : General Cat. of 6.7GHz Methanol Masers (Pestalozzi+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/486/191https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/486/191http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/486/191https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/486/191https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/486/191http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/486/191GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/486/191/table1 (6.7 GHz methanol maser properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/486/191/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/486/191/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/486/191/table1?GETtext/xml+votable180.050000true272.25-20.082220.0055555555555555566/14704 19456 29091 29094 29097 29100-29101 29114-29115 29505 29510 29533 30218-30219 30256 30262 30313 30315 30601 30617 30622 30694 30701https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/486/191?format=asciiOpticalRadiodefaultJ/A+A/486/191/table16.7 GHz methanol maser propertiesKDA[NFT? ] KDA resolution (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceMethanol maser source name (LL.ll+D.dd)meta.id;meta.maincharm_Source[AB] Multiplicity index for sources which have two recombination line velocities in the same line of sightmeta.code.multipcharn_Source[abcde] Note on Source (1)meta.notecharNVSSNVSS source (HHMMSS+DDMMSS) associated with the methanol masermeta.id.assoccharu_NVSS[?] Uncertainty flag on NVSSmeta.code.errorcharVmin? LSR Velocity extent of the maser emission, lower limitkm/sphys.veloc;phys.emissMeasure;pos.lsrintnullableVmax? LSR Velocity extent of the maser emission, upper limitkm/sphys.veloc;phys.emissMeasure;pos.lsrintnullableVsysSystemic velocity, derived from the radio recombination linekm/sphys.velocfloatq_KDA[AB ] Quality grade of the KDA resolutionmeta.code.qualchard? Distance (3)kpcpos.distance;pos.heliocentricfloatnullableE_d? Error on d, upper limit (5)kpcstat.error;stat.maxfloatnullablee_d? Error on d, lower limit (5)kpcstat.errorfloatnullabled'? Modified kinematic distance (4)kpcpos.distance;pos.heliocentricfloatnullableE_d'? Error on d', upper limit (5)kpcstat.error;stat.maxfloatnullablee_d'? Error on d', lower limit (5)kpcstat.errorfloatnullablesigmarms noise in the 21cm continuum image (in mJy/beam)mJyinstr.det.noisefloat_RARight ascension (derived from NVSS) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from NVSS) for Eq=J2000degpos.eq.dec;meta.main