J/ApJ/815/91ivo://CDS.VizieR/J/ApJ/815/91doi:10.26093/cds/vizier.18150091CDSBurchett J.N.Tripp T.M.Prochaska J.X.Werk J.K.Tumlinson J.,O'Meara J.M.Bordoloi R.Katz N.Willmer C.N.A.2017-10-13T15:41:11Z2016-04-01T09:10:36ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyultraviolet-astronomyredshiftedTo investigate the evolution of metal-enriched gas over recent cosmic epochs as well as to characterize the diffuse, ionized, metal-enriched circumgalactic medium, we have conducted a blind survey for CIV absorption systems in 89 QSO sightlines observed with the Hubble Space Telescope Cosmic Origins Spectrograph. We have identified 42 absorbers at z<0.16, comprising the largest uniform blind sample size to date in this redshift range. Our measurements indicate an increasing CIV absorber number density per comoving path length (dN/dX=7.5+/-1.1) and modestly increasing mass density relative to the critical density of the universe ({Omega}_CIV_=10.0+/-1.5x10^-8^) from z~1.5 to the present epoch, consistent with predictions from cosmological hydrodynamical simulations. Furthermore, the data support a functional form for the column density distribution function that deviates from a single power law, also consistent with independent theoretical predictions. As the data also probe heavy element ions in addition to CIV at the same redshifts, we identify, measure, and search for correlations between column densities of these species where components appear to be aligned in velocity. Among these ion-ion correlations, we find evidence for tight correlations between CII and SiII, CII and SiIII, and CIV and SiIV, suggesting that these pairs of species arise in similar ionization conditions. However, the evidence for correlations decreases as the difference in ionization potential increases. Finally, when controlling for observational bias, we find only marginal evidence for a correlation (86.8% likelihood) between the Doppler line width b(CIV) and column density N(CIV).2015ApJ...815...91Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/815/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/A+A/583/A75 : Large Quasar Astrometric Catalogue 3 (LQAC-3) (Souchay+, 2015)J/ApJ/814/40 : Nearby galaxy filaments with UV obs. (Wakker+, 2015)J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem<=2.4 (Chen+, 2014)J/MNRAS/435/1198 : z~6 QSOs CIV doublet absorption systems (D'Odorico+, 2013)J/ApJ/777/168 : CIV & SiIV broad absorption line troughs in SDSS (Filiz+, 2013)J/ApJ/763/37 : Metals in SDSS QSOs I. 1.5<z<4.5 CIV absorbers (Cooksey+, 2013)J/ApJ/759/112 : The UV low-redshift intergalactic medium (Tilton+, 2012)J/ApJ/740/91 : Ly{alpha} and OVI in galaxies around quasars (Prochaska+, 2011)J/ApJ/729/87 : SiIV absorption systems (Cooksey+, 2011)J/MNRAS/401/2715 : CIV column densities in z<2.5 QSOs (D'odorico+, 2010)J/ApJ/708/868 : CIV candidates (Cooksey+, 2010)J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)J/ApJ/641/78 : CIV variability in 105 SDSS quasars (Wilhite+, 2006)J/ApJ/596/768 : Optical depths in 19 QSOs (Schaye+, 2003)J/A+A/283/759 : CIV QSO absorption systems (Petitjean+ 1994)http://www.nist.gov/pml/data/asd.cfm : NIST atomic spectra databasehttp://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/815/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/815/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/815/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/815/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/815/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/815/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/815/91/table1 (QSO sample for C IV survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/815/91/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/815/91/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/815/91/table1?GETtext/xml+votable180.050000true3.1001-10.3740.0055555555555555566/0 4204 4256 4824 4961 4966 5215 5413 5529 5687 5759 5773 5820 5821 5860 5861 5974 6087 6223 6488 6557 6606 7381 7460 8282 8838 8867 8939 8952 9018 9175 9186 9440 9457 9753 9756 9783 9817 10300 10433 10517 10602 10634 10659 10764 10889 10940 10969 11014 11021 11209 11396 16894 17251 17499 17673 17730 17772 18770 20008 23060 23203 25932 26017 26259 26396 26965 27006 27023 27079 27229 27338 27350 27376 27526 27562 28143 28201 28395 28401 28468 28471 28527 28546 28636 31422 31535 31658 36788https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/815/91?format=asciiUVOpticaldefaultJ/ApJ/815/91/table2Voigt profile fitting measurements by absorber componentIonIon identifierphys.atmol.ionStagecharf_Ion[ab] Flag on Ion (1)meta.codecharv[-177/214]? Velocity centroidkm/sspect.dopplerVelocintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO identifiermeta.idcharzabs[0.002/0.2] Absorption line derived redshiftsrc.redshiftdoubleLinesLines in profile fit in Angstroms0.1nmem.wlcharl_logNLimit flag on logN (2)meta.code.errorcharlogN[12.4/20.8]? Log column density of Ionlog(cm**-2)phys.columnDensityfloatnullablee_logN[0.01/2.4]? Uncertainty in logNlog(cm**-2)stat.errorfloatnullableb[6/126]? Doppler b-value parameterkm/sspect.dopplerParamintnullablee_b[0/27]? Uncertainty in bkm/sstat.errorintnullablee_v[1/68]? Uncertainty in vkm/sstat.errorintnullableJ/ApJ/815/91/table1QSO sample for C IV surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQSO identifiermeta.id;meta.maincharNlNumber of absorber component for this QSOmeta.numberintnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainzqso[0.06/1.5] QSO spectroscopic redshiftsrc.redshift;pos.heliocentricfloatQSOAbbreviated QSO identifier as in table 2; column added by CDSmeta.idcharprimaryLQACDisplay the Large Quasar Astrometric Catalogue 3 (Souchay+, 2015, J/A+A/583/A75) within 1"meta.ref.urlintnullableDR7QDisplay the SDSS-DR7 quasar catalog (Schneider+, 2015, VII/260) within 1"meta.ref.urlintnullableSDSSDisplay the SDSS-DR9 photometric catalog (V/139) within 1"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar