J/MNRAS/471/3428ivo://CDS.VizieR/J/MNRAS/471/3428doi:10.26093/cds/vizier.74713428CDSRao S.M.Turnshek D.A.Sardane G.M.Monier E.M.2024-08-17T20:20:27Z2020-07-22T13:00:23ZCDS support team

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

cds-question@unistra.frquasarsultraviolet-astronomyline-intensitiesWe derive the statistical properties of neutral gas at redshifts 0.11<z<1.65 from ultraviolet (UV) measurements of quasar Ly{alpha} absorption lines corresponding to 369 MgII systems with W{lambda}2796_0_>=0.3{AA}. In addition to the 41 damped Lyman alpha (DLA) systems presented in Rao et al. (2006ApJ...636..610R, Cat. J/ApJ/636/610), the current DLA sample includes 29 newly discovered DLAs. Formally, this DLA sample includes 70 systems with N_HI_>=2*10^20^atoms/cm^2^. We find that the incidence of DLAs, or the product of their gas cross-section and their comoving number density, can be described by n_DLA_(z)=(0.027+/-0.007)(1+z)^(1.682+/-0.200)^ over the redshift range of 0<z<5. The cosmic mass density of neutral gas can be described by {Omega}_DLA_(z)=(4.77+/-1.60)x10^-4^(1+z)^(0.64+/-0.27)^. The low-redshift column density distribution function is well fitted by a power law of the form f(N)~N^{beta}^ with {beta}=-1.46+/-0.20. It is consistent with the high redshift as well as z=0 estimates at the high-column density end but lies between them at the low-column density end. We discuss possible N_HI_ and metallicity bias in Mg II-selected DLA samples and show that such biases do not exist in the current data at z<1.65. Thus, at least at z<1.65, DLAs found through MgII selection statistically represent the true population of DLAs. However, we caution that studies of DLA metallicities should take into account the relative incidence of DLAs with respect to W_0_{lambda}2796^ (or gas velocity spread) in order to2017MNRAS.471.3428Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/471/3428CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/636/610 : Damped Ly{alpha} systems at z<1.65 (Rao+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/471/3428https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/471/3428http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/471/3428https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/471/3428https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/471/3428http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/471/3428GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/471/3428/table1 (The GALEX archival sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3428/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3428/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3428/table1?GETtext/xml+votable180.050000true30.3097289-9.16653420.005555555555555556Cone search capability for table J/MNRAS/471/3428/table2 (The zabs<=0.4 MMT-HST COS sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3428/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3428/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3428/table2?GETtext/xml+votable180.050000true141.477944240.07060330.0055555555555555566/4677 5202 5345 5371 5696 5773 5861 6120 6244 6266 7254 7426 7448 7460 7507 8347 9372 9390 9440 9450 9604 9761 9843 9948 10191 10302 10325 10388 10468 10517 10526 10549 10654 10685 10761 11058 11086 11230 11424 11777 12752 17215 17497 17500-17501 19099 21972 26048 26051 27041 27160 27258 27413 27415 27458 27514 27732 27749 27765 28076 28141 28506 28538 31663 36726https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/471/3428?format=asciiUVdefaultJ/MNRAS/471/3428/table1The GALEX archival sampleSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQuasarQuasar name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharzemEmission redshiftsrc.redshiftfloatzabsAbsorption redshiftsrc.redshiftfloatMgIIW27960MgII {lambda}27960 equivalent width0.1nmspect.line.eqWidthfloate_MgIIW27960rms uncertainty on MgIIW279600.1nmstat.errorfloatMgIIW28030MgII {lambda}28030 equivalent width0.1nmspect.line.eqWidthfloate_MgIIW28030rms uncertainty on MgIIW280300.1nmstat.errorfloatl_MgIW28520[<= ] Limit flag on MgIW28520 (3{sigma} level upper limit)meta.code.errorcharMgIW28520? MgI {lambda}28520 equivalent width0.1nmspect.line.eqWidthfloatnullablee_MgIW28520? rms uncertainty on MgIW285200.1nmstat.errorfloatnullablel_FeIIW26000[<= ] Limit flag on FeIIW26000 (3{sigma} level upper limit)meta.code.errorcharFeIIW26000? FeII {lambda}26000 equivalent width0.1nmspect.line.eqWidthfloatnullablee_FeIIW26000? rms uncertainty on FeIIW260000.1nmstat.errorfloatnullablelogNHI? HI column density (1)log(cm**-2)phys.columnDensityfloatnullablee_logNHI? rms uncertainty on logNHIlog(cm**-2)stat.errorfloatnullable_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.mainJ/MNRAS/471/3428/table2The zabs<=0.4 MMT-HST COS sampleSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQuasarQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzemEmission redshiftsrc.redshiftfloatzabsAbsorption redshiftsrc.redshiftfloatMgIIW27960MgII {lambda}27960 equivalent width0.1nmspect.line.eqWidthfloate_MgIIW27960rms uncertainty on MgIIW279600.1nmstat.errorfloatMgIIW28030MgII {lambda}28030 equivalent width0.1nmspect.line.eqWidthfloate_MgIIW28030rms uncertainty on MgIIW280300.1nmstat.errorfloatl_MgIW28520[<= ] Limit flag on MgIW28520 (3{sigma} level upper limit)meta.code.errorcharMgIW28520MgI {lambda}28520 equivalent width0.1nmspect.line.eqWidthfloate_MgIW28520? rms uncertainty on MgIW285200.1nmstat.errorfloatnullablen_MgIW28520[c] Note on MgIW28520meta.notecharlogNHI? HI column densitylog(cm**-2)phys.columnDensityfloatnullablee_logNHI? rms uncertainty on logNHIlog(cm**-2)stat.errorfloatnullablen_logNHI[ab] Note on logNHI (1)meta.notechar_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