J/ApJS/166/526ivo://CDS.VizieR/J/ApJS/166/526doi:10.26093/cds/vizier.21660526CDSXu Y.Reid M.J.Menten K.M.Zheng X.W.2007-08-20T08:49:53Z2007-08-20T08:46:54ZCDS support team

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

cds-question@unistra.frradio-galaxiesWe have used the Very Large Array to search for compact milliarcsecond-size radio sources near methanol masers in high-mass star-forming regions. Such sources are required for very long baseline Interferometry phase-referencing observations. We conducted pointed observations of 234 compact sources found in the NVSS survey and find 92 sources with unresolved components and synchrotron spectral indexes. These sources are likely the cores of AGNs and, thus, are good candidates for astrometric calibrators.2006ApJS..166..526Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/166/526CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/40 : GB6 catalog of radio sources (Gregory+ 1996)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/MNRAS/332/422 : Galaxies morphology and IR photometry. VIII (Pierini+, 2002)J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)J/A+A/413/233 : 12.2 GHz methanol survey (Blaszkiewicz+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/166/526https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/166/526http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/166/526https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/166/526https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/166/526http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/166/526GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/166/526/table1 (12.2GHz Methanol maser sources considered)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/166/526/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/166/526/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/166/526/table1?GETtext/xml+votable180.050000true271.595417-21.61750.005555555555555556Cone search capability for table J/ApJS/166/526/table3 (Sources resolved in C- or U-band observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/166/526/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/166/526/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/166/526/table3?GETtext/xml+votable180.050000true36.7041762.205560.005555555555555556Cone search capability for table J/ApJS/166/526/table4 (Parameters of possible calibrators)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/166/526/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/166/526/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/166/526/table4?GETtext/xml+votable180.050000true36.31334166761.3210722220.0055555555555555565/7275 7578 7579 6/3648 3649 3652 12987 14311 14315 14316 14317 14352 14353 14355 14356 14358 15681 15683 21507 21510 21513 21516 23982 23983 24324 24325 24336 28808 28809 28810 28825 28828 28917 28919 28925 29088 29090 29091 29094 29095 29096 29097 29112 29115 29116 29445 29456 29523 29526 29527 29532 29533 29535 29557 30218 30222 30223 30244 30245 30247 30256 30258 30259 30262 30263 30265 30268 30269 30308 30311 30322 30328 30330 30405 30418 30419 30422 30425 30427 30428 30430 30692 30694 30695 42417 42419 42436 42437 42454 42455 42456 42458 42459 42460 42461https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/166/526?format=asciiRadiodefaultJ/ApJS/166/526/table112.2GHz Methanol maser sources consideredrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSource12.2GHz Methanol maser source namemeta.id;meta.maincharprimaryn_Source[a] Indicates no detected compact extragalactic radio sources within 1{deg}meta.notecharRAJ2000? Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000.0)pos.eq.dec;meta.mainnullableRegionName of the region containing the maser sourcemeta.id.parentcharCalDisplay the proposed calibrators associated to the maser sourcemeta.ref.urlcharJ/ApJS/166/526/table3Sources resolved in C- or U-band observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharf_Source[ab] Known Source (1)meta.codecharRAJ2000Hour of Right Ascension (J2000.0) (2)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000.0) (2)pos.eq.dec;meta.mainJ/ApJS/166/526/table4Parameters of possible calibratorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceMaser source namemeta.id.assoccharNameCalibrator namemeta.id;meta.maincharn_NameFlag on Name (1)meta.notecharRAJ2000Calibrator Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Calibrator Degree of Declination (J2000)pos.eq.dec;meta.mainS1.4GHz? NVSS L band 1.4GHz integrated flux density (2)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableS5GHz? C band 5GHz peak flux density (2)mJyphot.flux.density;em.radio.3-6GHzfloatnullableS15GHz? U band 15GHz peak flux density (2)mJyphot.flux.density;em.radio.12-30GHzfloatnullablealpha? Spectral index (3)spect.indexfloatnullablethetaUpper limit on maser size (4)arcsecphys.angSize;stat.maxfloatn_theta[abc] U-band data VLA configuration (5)meta.notecharSepSeparation between maser and calibratordegpos.angDistancefloatNVSSDisplay the NVSS data (Cat. VIII/65)meta.ref.urlchar