J/ApJ/708/868ivo://CDS.VizieR/J/ApJ/708/868doi:10.26093/cds/vizier.17080868CDSCooksey K.L.Thom C.Prochaska J.X.Chen H.-W.2017-09-27T05:55:28Z2012-03-26T13:40:13ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsspectroscopyultraviolet-astronomyredshiftedline-intensitiesWe surveyed the Hubble Space Telescope UV spectra of 49 low-redshift quasars for z<1 CIV candidates, relying solely on the characteristic wavelength separation of the doublet. After consideration of the defining traits of CIV doublets (e.g., consistent line profiles, other associated transitions, etc.), we defined a sample of 38 definite (group G=1) and five likely (G=2) doublets with rest equivalent widths W_r_ for both lines detected at >=3{sigma}_W_r__. We conducted Monte Carlo completeness tests to measure the unblocked redshift ({Delta}z) and co-moving path length ({Delta}X) over which we were sensitive to CIV doublets of a range of equivalent widths and column densities. Using the power-law model of f(N(C^+3^)), we measured the C^+3^ mass density relative to the critical density: {Omega}_C^+3^_=(6.20^+1.82^_-1.52_)x10^-8^ for 13<=logN(C^+3^)<=15.2010ApJ...708..868Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/708/868CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/157 : An Ultraviolet Atlas of Quasar and Blazar Spectra (Kinney+, 1991)J/A+A/530/A50 : Principal Component Analysis of QSO UV spectra (Paris+,J/MNRAS/401/2715 : CIV column densities in z<2.5 QSOs (D'odorico+, 2010)J/ApJ/702/767 : CIV and FeK{alpha} Baldwin effects in AGNs (Wu+, 2009)J/ApJ/666/757 : CIV(1549{AA} emission line in AGNs (Sulentic+, 2007)J/ApJS/164/1 : IGM absorbers toward HE 0226-4110 (Lehner+, 2006)J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004)J/ApJS/155/351 : Absorption toward PG 1116+215 (Sembach+, 2004)J/ApJS/122/355 : Properties of low z QSO absorption systems (Vanden Berk+,J/A+A/294/377 : HS1700+6416 UV absorption (Vogel+, 1995)J/ApJ/475/469 : Composite HST Spectrum of Quasars (Zheng+ 1997)http://www.ucolick.org/~xavier/HSTCIV/ : Supplementary data to this paperhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/708/868https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/708/868http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/708/868https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/708/868https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/708/868http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/708/868GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/708/868/targets (List of targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/708/868/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/708/868/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/708/868/targets?GETtext/xml+votable180.050000true1.581333320.20288610.005555555555555556Cone search capability for table J/ApJ/708/868/table1 (Observation summary (69 targets))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/708/868/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/708/868/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/708/868/table1?GETtext/xml+votable180.050000true1.5791720.202780.0055555555555555566/4850 5262 5264 5731 6576 7424 7642 7859 8017 8922 9457 9705 10217 10298 10578 10807 10912 10927 10940 11217 11388 11596 11668 11723 11898 12025 13414 15351 16671 17730 18601 18912 19283 19746 19807 19883 21126 22659 25245 25285 25302 25742 25965 26148 26270 26292 26509 26614 26650 27580 27720 27731 27862 27964 28356 28535 31663 32961 34065 34107 35180 35741 38268 39100 45526 47014 47375 48561 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/708/868?format=asciiUVOpticaldefaultJ/ApJ/708/868/targetsList of targetsSimbadNameSimbad column added by the CDSmeta.idcharzRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget namemeta.id;meta.maincharprimaryCSimbad column added by the CDSmeta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainNEDSimbad column added by the CDScharJ/ApJ/708/868/table1Observation summary (69 targets)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget name (G1)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatInstInstrument used in the observationinstr.setup;obscharGratingGrating used in the observationinstr.setup;obscharRGrating resolutionspect.resolutionintFWHMGrating FWHMkm/sinstr.bandwidthintl_S/N[<=] Limit flag on S/Nmeta.code.errorcharS/NSignal-to-noise from normalized spectrumpixel**-1stat.snrintWminMinimum wavelength of the observation (1)0.1nminstr.bandwidthintWmaxMaximum wavelength of the observation (1)0.1nminstr.bandwidthintTexpExposure timekstime.duration;obs.exposureintPIDObservation(s) identification numbermeta.id;obscharNotesAdditional notes(s)meta.notecharJ/ApJ/708/868/table2CIV candidates summary (49 targets)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget name (G1)meta.id;meta.maincharzTarget redshiftsrc.redshiftfloatz1548? CIV 1548 candidate redshiftsrc.redshiftdoublenullabledvabs? CIV 1550 candidate velocity differencekm/sphys.veloc;arith.difffloatnullablewvrTransition rest wavelength (1)0.1nmem.wlfloatwvloLower absorption line boundary (1)0.1nmem.wlfloatwvhiUpper absorption line boundary (1)0.1nmem.wlfloatl_EWrThe 2{sigma} limit flag on EWrmeta.code.errorcharEWrRest equivalent width (2)1e-13mspect.line.eqWidthinte_EWr? The 1{sigma} uncertainty in EWr (2)1e-13mstat.errorintnullablel_logNThe 2{sigma} limit flag on logNmeta.code.errorcharlogNLog column densitylog(cm**-2)phys.columnDensityfloatf_logN[a] Flag on logN (3)meta.codechare_logN? The 1{sigma} uncertainty in logNlog(cm**-2)stat.errorfloatnullableFlag[64,511]? Binary flag (4)meta.code.errorintnullable