J/ApJ/661/88ivo://CDS.VizieR/J/ApJ/661/88doi:10.26093/cds/vizier.16610088CDSKulkarni V.P.Khare P.Peroux C.York D.G.Lauroesch J.T.Meiring J.D.2017-09-20T05:14:02Z2009-05-03T17:54:40ZCDS support team

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

cds-question@unistra.frquasarsredshiftedspectroscopyObservations of low mean metallicity of damped Ly{alpha} (DLA) quasar absorbers at all redshifts studied appear to contradict the predictions for the global mean interstellar metallicity in galaxies from cosmic chemical evolution models. On the other hand, a number of metal-rich sub-DLA systems have been identified recently, and the fraction of metal-rich sub-DLAs appears to be considerably larger than that of metal-rich DLAs, especially at z<1.5. In view of this, here we investigate the evolution of metallicity in sub-DLAs. We find that the mean Zn metallicity of the observed sub-DLAs may be higher than that of the observed DLAs, especially at low redshifts, reaching a near-solar level at z<~1. This trend does not appear to be an artifact of sample selection, the use of Zn, the use of N_HI_ weighting, or observational sensitivity.2007ApJ...661...88Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/661/88CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/354/L31 : SDSS DR2 QSO and DLA properties (Murphy+, 2004)J/A+A/478/701 : Color excess of SDSS QSOs with DLA systems (Vladilo+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/661/88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/661/88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/661/88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/661/88https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/661/88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/661/88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/661/88/table1 (Zn Measurements in Sub-DLAs and DLAs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/661/88/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/661/88/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/661/88/table1?GETtext/xml+votable180.050000true15.22566672.19347220.0055555555555555566/2 2172 4168 4273 4279 4448 4820 5270 5306 5452 5780 5825 6219 6252 6403 6647 7426 7964 8192 8395 8939 9046 9523 9696 10061 10098 10177 10353 10432 10571 10753 11319 11765 12563 14959 15278 16269 16589 16644 17190 17317 17404 17835 17917 18029 18039 18042 18084 18086 18200 18366 18769 18790 18791 18858 18943 19206 19490 19682 20249 20450 20516 20657 21012 22917 23016 25120 25245 25285 25294 25307 25413 25427 25677 25863 25950 26165 26196 26245 26267 26288 26453 26479 26614 26878 27030 27037 27213 27215 27226 27302 27650 27704 27728 27747 28039 28042 28148 28281 28539 32466 34044 34107 34210 34379 34503 34691 34809 35751 36086 36101 36151 36346 38639 38744 38853 38878 40479 45525 46529 46542 46651 46864 48149 48154 48474https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/661/88?format=asciiOpticaldefaultJ/ApJ/661/88/table1Zn Measurements in Sub-DLAs and DLAsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeThe damped Lyman-alpha quasar absorber typesrc.classcharNameQuasar identificationmeta.id;meta.maincharRefReference code, in refs.dat filemeta.notecharzRedshift from absorption linessrc.redshiftfloatl_[Zn/H]Limit flag on [Zn/H]meta.code.error;phys.abundchar[Zn/H]Log of the Zn/H number abundancelog(Sun)phys.abundfloatNHIThe HI column density1e-20cm**-2phys.columnDensityfloate_NHIUncertainty in NHI1e-20cm**-2stat.errorfloatl_NZnIILimit flag on NZnIImeta.code.errorcharNZnIIThe ZnII column density1e-12cm**-2phys.columnDensityfloate_NZnII? Uncertainty in NNZnII1e-12cm**-2stat.errorfloatnullable[X/H]? Abundance of S or Si (1)log(Sun)phys.abundfloatnullablen_[X/H]Indicates element "X" in [X/H] (1)phys.atmol.elementcharEW2796? Equivalent width of MgII (2796{AA})0.1nmspect.line.eqWidthfloatnullableEW2600? Equivalent width of line at 2600{AA}0.1nmspect.line.eqWidthfloatnullableSimbadNameSimbad column added by the CDSmeta.idchar_RAfrom Simbad (right ascension part)degpos.eq.ra;meta.main_DEfrom Simbad (declination part)degpos.eq.dec;meta.mainJ/ApJ/661/88/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar