J/MNRAS/521/289ivo://CDS.VizieR/J/MNRAS/521/289CDSDavies R.L.Ryan-Weber E.D'odorico V.Bosman S.E.I.Meyer R.A.,Becker G.D.Cupani G.Bischetti M.Sebastian A.M.Eilers A.-C.,Farina E.P.Wang F.Yang J.Zhu Y.2026-07-27T08:40:45Z2026-07-27T09:33:58ZCDS support team

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

cds-question@unistra.frquasarsintergalactic-mediumspectroscopymolecular-physicsvisible-astronomyultraviolet-astronomyinfrared-astronomyredshiftedline-intensitiesgalaxy-kinematicsastronomical-reference-materialsIntervening metal absorption lines in the spectra of z ~> 6 quasars are fundamental probes of the ionization state and chemical composition of circumgalactic and intergalactic gas near the end of the reionization epoch. Large absorber samples are required to robustly measure typical absorber properties and to refine models of the synthesis, transport, and ionization of metals in the early Universe. The Ultimate XSHOOTER legacy survey of quasars at z ~ 5.8-6.6 (XQR-30) has obtained high signal-to-noise spectra of 30 luminous quasars, nearly quadrupling the existing sample of 12 high quality z ~ 6 quasar spectra. We use this unprecedented sample to construct a catalogue of 778 systems showing absorption in one or more of Mg II (360 systems), Fe II (184), C II (46), C IV (479), Si IV (127), and N V (13) which span 2 <~ z <~ 6.5. This catalogue significantly expands on existing samples of z ~> 5 absorbers, especially for C IV and Si IV which are important probes of the ionizing photon background at high redshift. The sample is 50 per cent (90 per cent) complete for rest-frame equivalent widths W ~> 0.03 {AA} (0.09 {AA}). We publicly release the absorber catalogue along with completeness statistics and a python script to compute the absorption search path for different ions and redshift ranges. This data set is a key legacy resource for studies of enriched gas from the era of galaxy assembly to cosmic noon, and paves the way for even higher redshift studies with JWST and 30 m-class telescopes.2023MNRAS.521..289Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/289CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/502/4009 : Sub-damped Lyman {alpha} systems in XQ-100 IIJ/MNRAS/499/5022 : MUSE Analysis of Gas around Galaxies II (Dutta+, 2020)J/MNRAS/485/1961 : List of 22 MEGAFLOW fields (Zabl+, 2019)J/MNRAS/462/3285 : XQ-100. X-shooter quasar spectra (Perrotta+, 2016)J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016)J/MNRAS/435/1198 : z~6 QSOs CIV doublet absorption systems (D'Odorico+,2013)J/ApJ/932/76 : Ly{beta} dark gaps in z<~6 QSOs spectra (Zhu+, 2022)J/ApJ/923/223 : VLT/X-SHOOTER & Keck/ESI spectra of z~5 QSOs (Zhu+, 2021)J/ApJ/883/163 : OI abs. search in Keck and VLT spectra of 199 QSOsJ/ApJ/794/156 : MgII/FeII absorption profile for 0.3<z<1.4 galaxiesJ/ApJ/788/119 : Properties of the highly ionized gas of quasarsJ/ApJ/761/112 : High-redshift MgII absorption QSOs with FIREJ/ApJS/227/11 : PS1 z>5.6 quasars follow-up (Banados+, 2016)J/ApJS/221/2 : Keck+Magellan survey for LLSs. III. (Prochaska+, 2015)J/other/Nat/605.244 : XQR-30 quasars sample (Bischetti+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/521/289https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/521/289http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/521/289https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/521/289https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/521/289http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/521/289GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/521/289/tableb1 (Adopted quasars emission redshifts and spectral resolutions for the XQR-30 and archival E-XQR-30)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/521/289/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/521/289/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/521/289/tableb1?GETtext/xml+votable180.050000true141.840918920.023230.0055555555555555566/471 2187 4279 4507 4662 8598 12576 17236 17358 17504 17654 17872 18155 18242 20116 21263 21872 22424 23304 23519 25375 26239 26524 26650 27327 27440 27676 30849 30906 33271 34762 35100 35304 35615 35675 44429 44753 44984 46284 46983 48313https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/521/289?format=asciiUVOpticalInfrareddefaultJ/MNRAS/521/289/tableb1Adopted quasars emission redshifts and spectral resolutions for the XQR-30 and archival E-XQR-30recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar name identifiermeta.id;meta.maincharprimaryTb4Link MWDs of tableb4.datmeta.ref.urlcharTb2Indicates data in tableb2meta.ref.urlcharzEmission redshift (z)src.redshiftfloatRvisSpectral resolution for VIS 559.5-1024 nm wavelengths (RVIS)spect.resolutionintRnirSpectral resolution for NIR 1024-2480 nm wavelengths (RNIR)spect.resolutionintSampleArchival quasars sample name of XSHOOTER either XQR-30 or enlarged E-XQR-30meta.id;src.samplecharr_zLiterature reference of the redshift z (Ref) (1)meta.ref;pos.framecharSpContDisplay the spectrum emission lines and continuum fitsmeta.ref.urlcharSpVoigtDisplay the Voigt profile fits of each individual absorption systemsmeta.ref.urlcharSimbadNameSimbad 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.mainJ/MNRAS/521/289/xqr30absThe full metal absorber catalog containing systems propertie for the 42 quasars sampleQSOQuasar name identifier (QsoID)meta.id.part;meta.maincharSampFlag of the sample constructed as string flag of Y or N answer to 4 questions (SampleFlags) (6)meta.codecharPrimFlag indicating whether the system is part of the primary sample as discussed in section 6.2 (PrimarySample)meta.codecharPorIFlag indicating whether the absorption system is proximate P or intervening I (ProximateOrIntervening) (7)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSystID? System identifier number as described in sect. 3.7 components are grouped into systems following a method similar to that described in D'Odorico et al. (2022MNRAS.512.2389D) (SystemID) (1)meta.id.part;meta.mainintnullableCompIDAbsorption component whcih are grouped into system, CompID consisting of a system number and a component label (ComponentID) (2)meta.id.part;meta.maincharzOptical-depth-weighted mean redshift systems or Voigt profile redshift components (z) (3)src.redshiftdoubleElIon or species with the associated transition wavelength in nm (Species)phys.atmol.elementcharEW? Rest frame equivalent width measurement (W)0.1nmspect.line.eqWidthfloatnullablee_EW? Error of EW (dW)0.1nmstat.error;spect.line.eqWidthfloatnullablef_EWFlag reported for each transition in each system (W_flag) (4)meta.codecharlogN? Column density measurement (logN)log(cm**-2)phys.columnDensityfloatnullablee_logN? Error of logN (dlogN)log(cm**-2)stat.errorfloatnullablef_logNFlag reported for both systems and individual components (logN_flag) (5)meta.codechardv90? The velocity interval enclosing 90 per cent of the absorption optical depth as in sect. 3.8 defined in Prochaska & Wolfe (1997ApJ...487...73P) (v90)km/sspect.line.widthintnullableb? The b Doppler parameter measurement of the absorption (b)km/sphys.absorptionfloatnullablee_b? Error of b parameter (db) ?km/sstat.errorfloatnullableJ/MNRAS/521/289/tableb2*Wavelength regions masked when performing the initial automatic search for absorption systemsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar name identifiermeta.id;meta.maincharLyaMin? Ly{alpha} minimum wavelength of the masked regionnmem.wlfloatnullableLyaMax? Ly{alpha} maximum wavelength of the masked regionnmem.wlfloatnullableTellYmin? Telluric(Y) minimum wavelength of the masked regionnmem.wlintnullableTelYmax? Telluric(Y) maximum wavelength of the masked regionnmem.wlintnullableTelJ-Hmin? Telluric(J-H) minimum wavelength of the masked regionnmem.wlintnullableTelJ-Hmax? Telluric(J-H) maximum wavelength of the masked regionnmem.wlintnullableTelH-Kmin? Telluric(H-K) minimum wavelength of the masked regionnmem.wlintnullableTelH-Kmax? Telluric(H-K) maximum wavelength of the masked regionnmem.wlintnullableTelK1min? First Telluric(K) minimum wavelength of the masked regionnmem.wlintnullableTelK1max? First Telluric(K) maximum wavelength of the masked regionnmem.wlintnullableTelK2min? Second Telluric(K) minimum wavelength of the masked regionnmem.wlintnullableTelK2max? Second Telluric(K) maximum wavelength of the masked regionnmem.wlintnullableJ/MNRAS/521/289/tableb4Wavelength regions in which BAL Broad Absorption Line signatures were detectedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar name identifiermeta.id;meta.maincharCIVCIV name ion speciesphys.atmol.elementcharCIVwminMinimum transition wavelength of the CIV0.1nmem.wldoubleCIVwmaxMaximum transition wavelength of the CIV0.1nmem.wldoubleSiIVSiIV name ion speciesphys.atmol.elementcharSiIVwmin? Minimum transition wavelength of the SiIV0.1nmem.wldoublenullableSiIVwmax? Maximum transition wavelength of the SiIV0.1nmem.wldoublenullableNVNV name ion speciesphys.atmol.elementcharNVwmin? Minimum transition wavelength of the NV0.1nmem.wldoublenullableNVwmax? Maximum transition wavelength of the NV0.1nmem.wldoublenullable