J/ApJ/767/14ivo://CDS.VizieR/J/ApJ/767/14doi:10.26093/cds/vizier.17670014CDSPursimo T.Ojha R.Jauncey D.L.Rickett B.J.Dutka M.S.Koay J.Y.,Lovell J.E.J.Bignall H.E.Kedziora-Chudczer L.Macquart J.-P.2018-01-02T13:42:32Z2014-12-12T13:48:23ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-sourcesredshiftedinfrared-photometryvisible-astronomyphotometryIntraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat spectrum sources revealed that the IDV is related to the radio flux density and redshift. A study of the physical properties of these sources has been severely handicapped by the absence of reliable redshift measurements for many of these objects. This paper presents 79 new redshifts and a critical evaluation of 233 redshifts obtained from the literature. We classify spectroscopic identifications based on emission line properties, finding that 78% of the sources have broad emission lines and are mainly FSRQs. About 16% are weak lined objects, chiefly BL Lacs, and the remaining 6% are narrow line objects. The gross properties (redshift, spectroscopic class) of the MASIV sample are similar to those of other blazar surveys. However, the extreme compactness implied by ISS favors FSRQs and BL Lacs in the MASIV sample as these are the most compact object classes. We confirm that the level of IDV depends on the 5GHz flux density for all optical spectral types. We find that BL Lac objects tend to be more variable than broad line quasars. The level of ISS decreases substantially above a redshift of about two. The decrease is found to be generally consistent with ISS expected for beamed emission from a jet that is limited to a fixed maximum brightness temperature in the source rest frame.2013ApJ...767...14Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/767/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)VIII/72 : CLASS survey of radio sources (Myers+, 2003)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)III/175 : Optical spectroscopy of radio sources (Stickel+, 1989-94)J/ApJ/756/29 : Scintillation of AGNs observed with the VLA (Koay+, 2012)J/AJ/142/108 : Radio variability of compact flat-spectrum AGNs (Koay+, 2011)J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)J/ApJ/689/108 : MASIV survey. II. First four epochs (Lovell+, 2008)J/ApJS/175/97 : CGRaBS: {gamma}-ray blazar candidates survey (Healey+, 2008)J/A+A/463/97 : Optical observations of GPS radio sources (Labiano+, 2007)J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007)J/ApJS/165/439 : Interstellar scintillation at 2 and 8GHz (Rickett+, 2006)J/ApJ/626/95 : Gamma-ray blazar candidates (Sowards-Emmerd+, 2005)J/ApJ/609/564 : Blazar counterparts for 3EG sources (Sowards-Emmerd+, 2004)J/MNRAS/351/83 : Blazars equivalent widths and radio luminosity (Landt+, 2004)J/MNRAS/348/937 : The CLASS blazar survey. III. (Caccianiga+, 2004)J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)J/ApJS/126/133 : The FIRST bright quasar survey. II. (White+, 2000)J/A+A/342/378 : 6 and 20cm flux densities of radio galaxies (Gurvits+ 1999)J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)J/ApJS/117/319 : Northern RASS X-ray sources catalog (Appenzeller+ 1998)J/ApJS/98/477 : Optical spectral atlas of Seyfert nuclei (Ho+ 1995)J/A+AS/103/349 : Optical identification of S4 sources (Stickel+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/767/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/767/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/767/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/767/14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/767/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/767/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/767/14/table2 (MASIV data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/767/14/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/767/14/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/767/14/table2?GETtext/xml+votable180.050000true1.48823138938.3375466670.0055555555555555566/35 47 110 124 180 304 483 556 579 597 625 700 911 1154 1584 1701 1740 1875 2053 2087 2098 2121 2124 2214 2354 2397 2456 2531 2631 2710 2836 2861 2978 3016 3024 3074 3096 3675 3820 3886 4027 4122 4405 4436 4446 4572 4644 4695 4696 4720 4754 4770 4820 5035 5139 5156 5163 5353 5413 5423 5448 5693 5817 5848 5984 6025 6099 6164 6173 6252 6335 6497 6507 6631 6641 6686 6716 6741 6751 6790 6824 6853 6996 7030 7099 7129 7148 7227 7235 7346 7389 7570 7623 7653 7709 7911 7937 7951 8031 8057 8131 8199 8324 8380 8526 8580 8588 8615 8716 8717 8772 8773 8793 8805 8830 9011 9016 9062 9159 9165 9204 9248 9442 9460 9483 9536 9545 9560 9588 9632 9633 9641 9676 9681 9685 9688 9723 9786 9813 9853 9860 9961 9976 10163 10198 10249 10321 10330 10352 10395 10422 10435 10524 10548 10550 10624 10803 10983 11037 11049 11185 11216 11279 11398 11430 11574 11640 11706 11759 11805 11821 11845 11878 12001 12133 12139 12301 12308 12311 12352 12397 12474 12475 12619 12621 13273 13277 13352 13410 13414 13427 13447 13537 13576 13578 13609 13664 13731 13739 13792 14495 14737 14820 14842 14854 14985 14996 15123 15271 15277 15525 15536 15594 15819 15936 15945 15947 16049 16113 16170 16281 16298 16351 17791 18035 18209 18214 18378 18806 18875 18923 18931 19101 19166 19170 19174 19189 19190 19217 19287 19298 19308 19357 19363 19593 19622 19629 19743 19872 19890 19918 20009 20099 20117 20141 20146 20184 20218 20468 21885 21935 21960 21968 21972 21991 22359 22363 22375 22396 22433 22501 22943 22965 23014 23015 23226 23274 23306 23416 23478 23786 23820 24084 24099 24123 25949 25975 26301 26303 26529 26550 27060 27310 27322 27323 27423 27523 27581 27583 27595 27605 27909 28003 28383 28453 28454 28479 28492 28584 28607 30484 30542 30557 31079 31143 31154 31190 31202 31211 31229 31391 31430 31451 31520 31527 31529 31534 31649 31664 31745 31792 31817 31857 31894 32035 32101 32247 32311 32325 32328 32358 32362 32391 32440 327643.313034785154005e-24 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/767/14?format=asciiOpticalInfraredRadiodefaultJ/ApJ/767/14/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibcodemeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommcommentmeta.notecharJ/ApJ/767/14/table2MASIV dataMASIVSource name (JHHMM+DDMM)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MASIV[C] C = secondary calibratorsmeta.notecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainS5[0.06/18.1] MASIV first epoch 5GHz flux densityJyphot.flux.density;em.radio.3-6GHzfloatNep[0/4] Number of epochs of variability based on visual classification from L08 (1)meta.numberintD2[0/0.3] Structure function D(2days) from L08 (1)src.var.indexdoubleE(B-V)[0/1] Galactic extinctionmagphot.color.excessfloatRmag[0/23.1] Galactic extinction corrected R band magnitudemagphot.mag;em.opt.Rfloatr_RmagReference for Rmag (see refs.dat file)meta.ref;pos.framecharz[0/4.1] Redshiftsrc.redshiftfloatEmLTEmission line type (T0, T1 or T2) (2)meta.code.classcharClassSpectroscopic identification (3)src.classcharRefReference(s) for z and Class (see refs.dat file)meta.ref;pos.framecharCommAdditional commentsmeta.notecharOCatCross-match within 1" with the optical catalogs: GSC2.3 (I/305), SDSS-DR7 (II/294) and USNO-B1 (I/284)meta.ref.urlintnullableSEDPlot the spectrum with SPECFIND (Vollmer et al. 2009, Cat. VIII/85)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar