J/MNRAS/464/L56ivo://CDS.VizieR/J/MNRAS/464/L56doi:10.26093/cds/vizier.74649056CDSBerg T.A.M.Ellison S.L.Prochaska J.X.Sanchez-Ramirez R.Lopez S.,D'Odorico V.Becker G.Christensen L.Cupani G.Denney K.Worseck G.2024-08-16T20:19:41Z2018-08-29T12:07:02ZCDS support team

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

cds-question@unistra.frquasarsredshiftedline-intensitiesThe XQ-100 survey provides optical and near-infrared coverage of 36 blindly selected, intervening damped Lyman {alpha} systems (DLAs) at 2<z_abs_<4, simultaneously covering the MgII doublet at {lambda}{lambda}2796,2803{AA}, and the Ly{alpha} transition. Using the XQ-100 DLA sample, we investigate the completeness of selecting DLA absorbers based on their MgII rest-frame equivalent width (W_0_^2796^) at these redshifts. Of the 29 DLAs with clean Mg II profiles, we find that six (20 per cent of DLAs) have W_0_^2796^<0.6{AA}. The DLA incidence rate of W_0_^2796^<0.6{AA} absorbers is a factor of ~5 higher than what is seen in z~1 samples, indicating a potential evolution in the MgII properties of DLAs with redshift. All of the W_0_^2796^<0.6{AA} DLAs have low metallicities (-2.5<[M/H]<-1.7), small velocity widths (v_90_<50km/s), and tend to have relatively low N(HI). We demonstrate that the exclusion of these low W_0_^2796^ DLAs results in a higher mean N(HI) which in turn leads to an ~7 per cent increase in the cosmological gas density of HI of DLAs at 2<z_abs_<4; and that this exclusion has a minimal effect on the HI-weighted mean metallicity.2017MNRAS.464L..56Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/464/L56CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/456/4488 : XQ-100 survey neutral gas (Sanchez-Ramirez+, 2016)J/MNRAS/462/3285 : XQ-100 targets equivalent widths (Perrotta+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/464/L56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/464/L56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/464/L56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/464/L56https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/464/L56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/464/L56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/464/L56/table1 (DLA properties and equivalent widths)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/464/L56/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/464/L56/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/464/L56/table1?GETtext/xml+votable180.050000true0.8456383-26.05508440.0055555555555555566/4169 4267 6219 8215 16589 17751 18007 18200 18381 18642 19490 19759 25863 26520 27232 27511 27542 27646 28171 28312 31659 31706 32466 33746 34262 34375 34809 34850 35764 36466https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/464/L56?format=asciidefaultJ/MNRAS/464/L56/table1DLA properties and equivalent widthsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO name (JHHMM+DDMM)meta.id;meta.maincharzemEmission redshiftsrc.redshiftfloatzabsAbsoprtion redshiftsrc.redshiftfloatlogN(HI)HI column densitylog(cm**-2)phys.columnDensityfloate_logN(HI)rms uncertainty on logN(HI)log(cm**-2)stat.errorfloatl_W2796-0Limit flag on W2796-0meta.code.errorcharW2796-0? MgII 2796{AA} rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_W2796-0? rms uncertainty on W2796-00.1nmstat.errorfloatnullablel_W2803-0Limit flag on W2803-0meta.code.errorcharW2803-0? MgII 2803{AA} rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_W2803-0? rms uncertainty on W2803-00.1nmstat.errorfloatnullableW2600-0? MgII 2600{AA} rest-frame equivalent width0.1nmspect.line.eqWidthfloatnullablee_W2600-0? rms uncertainty on W2600-00.1nmstat.errorfloatnullable[M/H]Metallicityphys.abund.Zfloate_[M/H]rms uncertainty on [M/H]stat.error;phys.abundfloatElElementphys.atmol.elementcharv90Velocity widthkm/sspect.line.widthintD-index? D-index (1)spect.indexfloatnullableD-indexcutCut for D-index (2)spect.indexfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main