J/MNRAS/488/4356ivo://CDS.VizieR/J/MNRAS/488/4356CDSBerg T.A.M.Ellison S.L.Sanchez-Ramirez R.Lopez S.D'odorico V.,Becker G.D.Christensen L.Cupani G.Denney K.D.Worseck G.2023-11-02T14:32:35Z2023-11-02T15:32:15ZCDS support team

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

cds-question@unistra.frquasarsh-i-line-emissionredshiftedradio-sourcesSub-damped Lyman {alpha} systems (subDLAs; HI column densities of 19.0<=logN(HI)<20.3) are rarely included in the cosmic HI census performed at redshifts z_abs_>=1.5, yet are expected to contribute significantly to the overall HI mass budget of the Universe. In this paper, we present a blindly selected sample of 155 subDLAs found along 100 quasar sightlines (with a redshift path-length {Delta}X=475) in the XQ-100 legacy survey to investigate the contribution of subDLAs to the H I mass density of the Universe. The impact of X-Shooter's spectral resolution on Ly {alpha} absorber identification is evaluated, and found to be sufficient for reliably finding absorbers down to a column density of logN(HI)>=18.9. We compared the implications of searching for subDLAs solely using HI absorption versus the use of metal lines to confirm the identification, and found that metal-selection techniques would have missed 75 subDLAs. Using a bootstrap Monte Carlo simulation, we computed the column density distribution function (f(N, X)) and the cosmological H I mass density (Omega_HI_) of subDLAs and compared with our previous work based on the XQ-100 damped Lyman {alpha} systems. We do not find any significant redshift evolution in f(N, X) or Omega_HI_ for subDLAs. However, subDLAs contribute 10-20 per cent of the total Omega_HI_ measured at redshifts 2<z<5, and thus have a small but significant contribution to the HI budget of the Universe.2019MNRAS.488.4356Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/4356CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/456/4488 : XQ-100 survey neutral gas (Sanchez-Ramirez+, 2016)J/MNRAS/462/3285 : XQ-100. X-shooter quasar spectra (Perrotta+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/4356https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/4356http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/4356https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/4356https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/4356http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/4356GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/4356/table1 (HI absorbers in XQ-100)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/4356/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/4356/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/4356/table1?GETtext/xml+votable180.050000true0.8456383-26.05508440.0055555555555555566/514 4169 4177 4233 4263 4267 4369 4648 4761 6219 8215 8218 8277 8627 8765 16417 16589 16666 16894 17679 17735 17751 17818 18007 18200 18209 18381 18466 18499 18642 19490 19759 21885 25597 25827 25863 26037 26167 26233 26369 26375 26492 26520 26596 26846 26882 26976 27232 27436 27445 27484 27498 27511 27524 27542 27646 27917 28171 28312 30836 31313 31659 31706 32466 33746 34262 34271 34375 34809 34850 35241 35759 35764 35770 36217 36271 36466 36834 37533 43983 45460https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/4356?format=asciiRadiodefaultJ/MNRAS/488/4356/table1HI absorbers in XQ-100recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQSO name (JHHMM+DDMM)meta.id;meta.maincharzemEmission redshift of the QSOsrc.redshiftfloatzabsAbsorption redshiftsrc.redshiftdoublelogNHILogarithm of HI column densitylog(cm**-2)phys.columnDensityfloate_logNHIError on logNHIlog(cm**-2)stat.errorfloatAbs[Y/N] Detected metal absorptionmeta.codecharSimbadNameSimbad column added by the CDSmeta.idcharnullable_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