J/AJ/151/154ivo://CDS.VizieR/J/AJ/151/154doi:10.26093/cds/vizier.51510154CDSGordon D.Jacobs C.Beasley A.Peck A.Gaume R.Charlot P.Fey A.,Ma C.Titov O.Boboltz D.2020-09-01T13:46:10Z2016-07-28T12:03:28ZCDS support team

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

cds-question@unistra.frsurveysvery-long-baseline-interferometryradio-sourcesquasarsSix very successful Very Long Baseline Array (VLBA) calibrator survey campaigns were run between 1994 and 2007 to build up a large list of compact radio sources with positions precise enough for use as very long baseline interferometry (VLBI) phase reference calibrators. We report on the results of a second epoch VLBA Calibrator Survey campaign (VCS-II) in which 2400 VCS sources were re-observed in the X and S bands in order to improve the upcoming third realization of the International Celestial Reference Frame (ICRF3) as well as to improve their usefulness as VLBI phase reference calibrators. In this survey, some 2062 previously detected sources and 324 previously undetected sources were detected and revised positions are presented. Average position uncertainties for the re-observed sources were reduced from 1.14 and 1.98mas to 0.24 and 0.41mas in R.A. and decl., respectively, or by nearly a factor of 5. Minimum detected flux values were approximately 15 and 28mJy in the X and S bands, respectively, and median total fluxes are approximately 230 and 280mJy. The vast majority of these sources are flat-spectrum sources, with ~82% having spectral indices greater than -0.5.2016AJ....151..154Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/154CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/323 : International Celestial Reference Frame 2, ICRF2 (Ma+, 2009)J/AJ/150/58 : VLBI ICRF2 (Fey+, 2015)J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)http://gemini.gsfc.nasa.gov/solutions/ : Full GSFC catalog of all S/X sourceshttp://lupus.gsfc.nasa.gov/ : GSFChttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/154https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/154/catalog (VCS-II catalog: re-observed sources (table 2) , and originally undetected VCS sources (table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/154/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/154/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/154/catalog?GETtext/xml+votable180.050000true0.084999874583-32.3503425722220.0055555555555555566/27 35 48 49 103 128 175 226 247 250 255 344 392 448 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assigned by the VizieR team. Should Not be used for identification.meta.recordintScemeta.codecharVCS-IIIdentifier based on J2000 positions (JHHMM+DDMM format) (1)meta.id;meta.maincharIVSIdentifier from the International Very long baseline interferometry (VLBI) Service for Geodesy and Astrometry (IVS) (HHMM+DDd, B1950)meta.idcharVCSmeta.numberintnullableICRF2meta.numberintnullableRAJ2000Hour of Right Ascension (J2000) (2)pos.eq.ra;meta.mainSXtot[0.02/5.5] Total X band (~8.6GHz) flux density (3)Jyphot.flux.density;em.radio.6-12GHzfloatSXun[0/1.57] Unresolved X band (~8.6 GHz) flux density (3)Jyphot.flux.density;em.radio.6-12GHzfloatalpha[-1.91/1.44] Spectral index {alpha} (where S_{nu}_{propto}{nu}^{alpha}^) (3)spect.indexfloatDateDate of the flux observationstime.epochnullableNobs[3/986] Total number of observations (4)meta.numberintONameOther name(s)meta.idchar