J/AJ/142/108ivo://CDS.VizieR/J/AJ/142/108doi:10.26093/cds/vizier.51420108CDSKoay J.Y.Macquart J.-P.Rickett B.J.Bignall H.E.Lovell J.E.J.,Reynolds C.Jauncey D.L.Pursimo T.Kedziora-Chudczer L.Ojha R.2017-12-06T07:38:54Z2013-02-01T15:28:07ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-sourcesThe 4.9GHz Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey detected a drop in interstellar scintillation (ISS) for sources at redshifts z>~2, indicating an apparent increase in angular diameter or a decrease in flux density of the most compact components of these sources relative to their extended emission. This can result from intrinsic source size effects or scatter broadening in the intergalactic medium (IGM) in excess of the expected (1+z)^1/2^ angular diameter scaling of brightness temperature limited sources resulting from cosmological expansion. We report here 4.9GHz and 8.4GHz observations and data analysis for a sample of 140 compact, flat-spectrum sources which may allow us to determine the origin of this angular diameter-redshift relation by exploiting their different wavelength dependences. In addition to using ISS as a cosmological probe, the observations provide additional insight into source morphologies and the characteristics of ISS.2011AJ....142..108Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/142/108CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/689/108 : MASIV survey. II. First four epochs (Lovell+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/142/108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/142/108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/142/108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/142/108https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/142/108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/142/108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/142/108/table2 (List of sources and their properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/142/108/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/142/108/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/142/108/table2?GETtext/xml+votable180.050000true2.43112515.22719440.0055555555555555566/124 180 197 579 597 625 1152 1154 1584 1593 1610 2053 2087 2098 2531 2978 3886 4027 4405 4446 5035 5817 5848 6173 6507 6631 6790 6853 7148 7227 7235 7570 7623 7709 7724 7951 8073 8131 8324 9248 9545 9560 9641 9723 9813 9961 9976 10198 10550 11037 11398 11640 11805 11821 11845 11878 11977 12001 12133 12311 12352 12397 12619 12621 12851 13352 13414 13427 13739 13792 14495 14820 14985 14996 15123 15277 15945 15947 16170 16351 18035 18209 18806 18923 19174 19308 19357 19676 19743 20218 21935 21960 21968 22359 22363 22375 22396 22433 22965 23226 23274 23306 23416 23478 23730 23786 24084 24123 27322 27323 27583 27605 28383 28479 31190 31202 31229 31529 31649 31792 31894 32035 32101 32247 32311 32328 32391 327643.2467741526420485e-24 5.5658981862942334e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/142/108?format=asciiRadiodefaultJ/AJ/142/108/table2List of sources and their propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIAU name (JHHMM+DDMM), MASIV JHHMM+DDMM in Simbadmeta.id;meta.maincharHalphaH{alpha} Intensities from WHAM (Wisconsin H{alpha} Mapper database; see Haffner et al. 2003, Cat. II/249). Expressed in Rayleigh, i.e. 10^10^ph/m^2^/s.phot.flux;em.line.HalphafloatS8.4Mean flux density at 8.4GHzJyphot.flux.density;em.radio.6-12GHzfloatS4.9Mean flux density at 4.9GHzJyphot.flux.density;em.radio.3-6GHzfloatalphaSource spectral index {alpha}spect.indexfloatl_tau8.4Limit flag on tau8.4meta.code.errorchartau8.4? Estimated characteristic timescale of source variability at 8.4GHzssrc.varfloatnullablee_tau8.4? rms uncertainty on tau8.4sstat.errorfloatnullablel_tau4.9Limit flag on tau4.9meta.code.errorchartau4.9? Estimated characteristic timescale of source variability at 4.9GHzssrc.varfloatnullablee_tau4.9? rms uncertainty on tau4.9sstat.errorfloatnullablem8.4Raw modulation index at 8.4GHz with no error subtraction%src.var.indexfloatm4.9Raw modulation index at 4.9GHz with no error subtraction%src.var.indexfloatD(4d)8.44 day structure function at 8.4GHz with D_noise_ subtractedsrc.var.indexdoublee_D(4d)8.4rms uncertainty on D(4d)8.4stat.errordoubleD(4d)4.94 day structure function at 4.9GHz with D_noise_ subtractedsrc.var.indexdoublee_D(4d)4.9rms uncertainty on D(4d)4.9stat.errordoubleSimbadSimbad column added by the CDSmeta.refchar_RAPositions from Lovell et al. (2008, Cat. J/ApJ/689/108) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Lovell et al. (2008, Cat. J/ApJ/689/108) (declination part)degpos.eq.dec;meta.main