J/AJ/130/2529ivo://CDS.VizieR/J/AJ/130/2529doi:10.26093/cds/vizier.51302529CDSOjha R.Fey A.L.Charlot P.Jauncey D.L.Johnston K.J.Reynolds J.E.,Tzioumis A.K.Quick J.F.H.Nicolson G.D.Ellingsen S.P.McCulloch P.M.,Koyama Y.2017-12-12T14:44:33Z2016-08-05T10:13:23ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsWe present 8.4GHz very long baseline interferometry (VLBI) observations of 48 southern hemisphere extragalactic sources from the International Celestial Reference Frame. These are the second in a series of observations intended to image all such sources in the southern hemisphere at milliarcsecond resolution and bring the total number of observed sources to 111. We use these data, together with previously published data, to quantify the magnitude of the expected effect of intrinsic source structure on astrometric bandwidth synthesis VLBI observations by calculating a "structure index" for the sources; the structure index yields an estimate of their astrometric quality.2005AJ....130.2529Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/130/2529CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997)J/AJ/127/3587 : VLBI ICRF. II (Fey+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/130/2529https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/130/2529http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/130/2529https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/130/2529https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/130/2529http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/130/2529GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/130/2529/table4 (Physical characteristics of sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/130/2529/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/130/2529/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/130/2529/table4?GETtext/xml+votable180.050000true12.4979492-57.6408350.0055555555555555566/25428 25677 29016 32841 33043 33684 33829 34428 34517 34534 34699 34870 34871 35294 36941 37064 37217 37474 37480 38383 38579 38734 39181 39377 40344 40990 41059 41072 41511 42883 44147 44614 45011 45110 45162 45196 46562 46709 46851 46921 46931 47016 47375 47941 48142https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/130/2529?format=asciidefaultJ/AJ/130/2529/table4Physical characteristics of sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPKSSource namemeta.id;meta.maincharprimaryISimbad column added by the CDSmeta.numberintnullableGSimbad column added by the CDSmeta.ref.urlcharf_PKS[QG? ] QSO or Galaxymeta.codecharmag[8.98/24]? Visual magnitudemagphot.mag;em.opt.VfloatnullableBand[B]Bandpass to which the magnitude applies (1)instr.bandpasscharz[0.003/3.8]? Redshiftsrc.redshiftfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from SIMBAD database (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from SIMBAD database (declination part)degpos.eq.dec;meta.mainnullableJ/AJ/130/2529/table3Gaussian modelsPKSSource namemeta.id;meta.maincharComp[1/3] Component numbermeta.code.multipintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS[0.006/2.28] Total component flux densityJyphot.flux.densityfloatDist[0/75.9] Distance of component from coremaspos.angDistancefloattheta[-167/131]? Orientation of component (1)degpos.posAngintnullableMajAxis[0/5.66] Length of major axis of componentmasphys.angSize.smajAxisfloatb/a[0.36/1] Axial ratio (2)phys.angSize;arith.ratiofloatphi[-67/26]? Orientation of major axis of component (3)degphys.angSizeintnullableJ/AJ/130/2529/table5Source structure indexPKSSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinttau-mean[0.1/1385.5] Mean structure delay correctionpstime;arith.difffloattau-rms[0.2/1667] RMS structure delay correctionpstime;arith.difffloattau-max[0.4/6458.7] Maximum structure delay correctionpstime;arith.difffloattau-median[0.1/1313] Median structure delay correctionpstime;arith.difffloatS-Index[1/4] Structure index (1)meta.codeintEpoch[A-E] Observational epoch (2)time.epochchar