J/MNRAS/401/2715ivo://CDS.VizieR/J/MNRAS/401/2715doi:10.26093/cds/vizier.74012715CDSD'Odorico V.Calura F.Cristiani S.Viel M.2024-07-10T20:17:03Z2010-07-24T15:36:02ZCDS support team

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

cds-question@unistra.frquasarsredshiftedspectroscopyThe cosmic evolution of the metal content of the intergalactic medium puts stringent constraints on the properties of galactic outflows and on the nature of UV background. In this paper, we present a new measure of the redshift evolution of the mass density of CIV, {OMEGA}_CIV_, in the interval 1.5~<z~<4 based on a sample of more than 1500 CIV lines with column densities 10^12^~<N(CIV)~<10^15^cm^-2^. This sample more than doubles the absorption redshift path covered in the range z<2.5 by previous samples. The result shows a significant increase of {OMEGA}_CIV_ towards the lower redshifts at variance with the previously pictured constant behaviour.2010MNRAS.401.2715Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/401/2715CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/283/759 : CIV QSO absorption systems (Petitjean+ 1994)J/A+A/473/791 : CIV absorption in DLAs and sub-DLAs systems (Fox+, 2007)J/ApJ/641/78 : CIV variability in 105 SDSS quasars (Wilhite+, 2006)J/ApJ/666/757 : CIV(1549{AA} emission line in AGNs (Sulentic+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/401/2715https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/401/2715http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/401/2715https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/401/2715https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/401/2715http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/401/2715GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/401/2715/sources (List of studied QSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/401/2715/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/401/2715/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/401/2715/sources?GETtext/xml+votable180.050000true206.112917-10.5950.0055555555555555566/8912 16269 16625 16656 25285 25344 25697 29795 34202 34485 34570 35213 35496 35595 35627 36130 36417 40446 43903 44269 45526 46418 47007 47941 48610https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/401/2715?format=asciiOpticaldefaultJ/MNRAS/401/2715/sourcesList of studied QSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQSO namemeta.id;meta.maincharprimaryRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000)pos.eq.dec;meta.mainzemEmission redshift (from original table2)src.redshiftfloatSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharJ/MNRAS/401/2715/table2CIV absorption lineszRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQSO namemeta.id;meta.maincharbDoppler parameter, bkm/sspect.dopplerParamfloate_b? rms uncertainty on bkm/sstat.errorfloatnullablelogN(CIV)CIV column densitylog(cm**-2)phys.columnDensityfloate_logN(CIV)rms uncertainty on logN(CIV)log(cm**-2)stat.errorfloat