J/ApJ/543/552ivo://CDS.VizieR/J/ApJ/543/552doi:10.26093/cds/vizier.15430552CDSStorrie-Lombardi L.J.Wolfe A.M.2017-11-10T11:16:41Z2004-06-06T07:23:01ZCDS support team

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

cds-question@unistra.frquasarsredshiftedWe have completed spectroscopic observations using LRIS on the Keck 1 telescope of 30 very high redshift quasars, 11 selected for the presence of damped Ly{alpha} absorption systems and 19 with redshifts z>3.5 not previously surveyed for absorption systems. We have surveyed an additional 10 QSOs with the Lick 120" and the Anglo-Australian Telescope. We have combined these with previous data, resulting in a statistical sample of 646 QSOs and 85 damped Ly{alpha} absorbers with column densities N_HI_>=2 10^20^atoms/cm^2^ covering the redshift range 0.008<=z<=4.694. Four main features of how the neutral gas in the universe evolves with redshift are evident from these data.2000ApJ...543..552Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/543/552CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/182 : Catalog of high-redshift QSOs, z>=2.2, in SGP & F401 (Warren+, 1991)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/543/552https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/543/552http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/543/552https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/543/552https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/543/552http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/543/552GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/543/552/table5 (Statistical Sample: QSOs with damped Lyman{alpha} absorbers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/543/552/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/543/552/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/543/552/table5?GETtext/xml+votable180.050000true0.845458-26.0546670.005555555555555556Cone search capability for table J/ApJ/543/552/table6 (Statistical sample: QSOs without damped Lyman{alpha} absorbers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/543/552/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/543/552/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/543/552/table6?GETtext/xml+votable180.050000true0.92758.9944440.0055555555555555565/4507 6805 6/6 8 419 532 592 674 2098 2172 2245 2348 2414 4027 4168 4273 4280 4315 4332 4333 4350 4361 4594 4695 4770 4947 5033 5091 5163 5262 5264 5306 5312 5563 5676 5722 5731 5780 5793 5848 5974 5999 6033 6038 6264 6412 6535 6853 7193 7424 7426 7508 7683 7741 7857 7964 8017 8071 8218 8253 8282 8376 8388 8393 8395 8525 8631 8641 8714 8845 8858 8927 8952 9031 9095 9121 9138 9181 9194 9262 9272 9457 9489 9490 9633 9705 9711 9933 9955 9997 10084 10217 10228 10265 10298 10385 10422 10463 10472 10473 10491 10495 10501 10578 10629 10659 10691 10694 10707 10765 10807 10940 11217 11430 11461 11668 11723 11765 11782 11829 12025 12317 12380 12580 12604 12632 13213 13314 13496 14858 15241 15351 16043 16059 16093 16109 16301 16589 16640 16641 16642 16644 16652 16654 16656 16657 16660 16664 16665 16666 16752 16831 17075 17211 17404 17406 17509 17564 17730 17735 17749 17813 17818 17819 17825 17857 17866 17890 17898 17917 17969 17973 17979 17981 17990 17993 17994 17995 17998 18001 18008 18016 18019 18022 18023 18024 18025 18032 18033 18035 18038 18039 18040 18041 18042 18055 18056 18060 18066 18074 18078 18080 18081 18084 18086 18092 18098 18100 18101 18102 18106 18107 18116 18125 18180 18366 18381 18414 18466 18499 18642 18661 18679 18738 18769 18809 18827 18852 18853 18854 18858 18867 18868 18871 18872 18912 19190 19204 19206 19239 19287 19315 19416 19433 19456 19459 19461 19464 19465 19467 19468 19510 19560 19567 19609 19618 19700 19703 19730 19740 19746 19767 19807 19845 19932 20202 20624 21012 21126 21790 21935 21990 22363 22576 22594 22659 22690 22754 22917 22965 22987 23016 23099 23126 23203 23210 23214 23215 23222 23233 24571 25120 25472 25540 25658 25742 25817 25818 25848 25849 25850 25934 25935 25938 25944 25947 25950 25965 25976 25977 25986 25995 26000 26024 26026 26040 26083 26131 26166 26169 26173 26175 26182 26189 26199 26203 26206 26218 26245 26257 26260 26263 26269 26292 26297 26307 26313 26371 26372 26373 26374 26408 26451 26453 26462 26470 26476 26479 26481 26482 26509 26614 26615 26650 26846 26879 26881 26882 26947 26951 26957 26958 26963 26966 26968 26972 26974 26975 27023 27025 27074 27114 27127 27161 27204 27205 27207 27219 27225 27227 27232 27549 27578 27580 27583 27608 27648 27704 27717 27720 27728 27731 27739 27740 27742 27743 27745 27747 27748 27749 27751 27753 27756 27757 27761 27763 27765 27767 27769 27771 27787 27793 27801 27803 27806 27815 27830 27845 27848 27862 27863 27865 27868 27869 27893 27907 27913 27936 27939 27941 27943 27947 27948 27951 27952 27955 27963 27964 28036 28038 28039 28041 28042 28043 28050 28060 28086 28148 28356 28383 28471 28479 28517 28532 28539 29795 30029 30047 31176 31355 31529 31656 31663 32746 32961 34065 34123 34264 34501 34503 34570 35241 35583 35737 35741 35748 35749 35751 35752 35754 35759 35762 35764 35770 35771 35772 36086 36090 36101 36130 36217 36241 36260 36268 36320 36417 36445 36522 36648 36834 36863 37385 37474 37650 38836 40527 40838 43417 44028 44043 44785 46373 46637 46651 46722 46724 46728 46731 46737 46739 46740 46746 46753 46864 47014 47206 47375 47941 48166 48460 48462 48463 48474 48475 48482 48498 48610 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/543/552?format=asciiOpticaldefaultJ/ApJ/543/552/table1LRIS Journal of ObservationsQSOQSO namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzemEmission redshiftsrc.redshiftfloatDateObservation datetime.epochnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableRmag? R magnitudemagphot.mag;em.opt.RfloatnullablelambdaCentral wavelength of the grating settingnmem.wl.centralfloatExpTimeExposure timestime.duration;obs.exposureintGratingNumber of grooves per millimeter of the gratinginstr.paramintr_QSO? Reference to observations reporting discovery of the candidate (in ref.dat)meta.refintnullableJ/ApJ/543/552/table2LRIS follow-up of Candidate damped Lyman{alpha} absorbersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO namemeta.id;meta.maincharzemEmission redshiftsrc.redshiftfloatVmag? V magnitude of the QSOmagphot.mag;em.opt.VfloatnullableRmag? R magnitude of the QSOmagphot.mag;em.opt.RfloatnullableRefReference of the low-resolution survey (1)meta.refcharzabsSurvey absorption redshiftsrc.redshiftfloatEWLy{alpha}Survey Ly{alpha} equivalent width0.1nmspect.line.eqWidthfloatlogNHI? Survey HI column densitylog(cm**-2)phys.columnDensityfloatnullablezabs2? Follow-up absorption redshift (2)src.redshiftfloatnullablen_zabs2[abc] Note on components (3)meta.notecharlogNHI2? Follow-up HI column density (2)log(cm**-2)phys.columnDensityfloatnullablee_logNHI2? rms uncertainty on logNHI2log(cm**-2)stat.errorfloatnullableNotDampedNot damped (no zabs2 and logNHI2 values)meta.codecharJ/ApJ/543/552/table3New LRIS Survey Datazmax? Maximum redshift valuesrc.redshiftfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO name (1)meta.id;meta.maincharzemEmission redshiftsrc.redshiftfloatn_zem[d] Note on zem (2)meta.notecharzmin? Minimum redshift valuesrc.redshiftfloatnullablezabs? Absorption redshiftsrc.redshiftfloatnullablen_zabs[abc] Note on Components (3)meta.notecharEWLyA? Ly{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullablel_logNHI[<= ] Limit flag on logNHImeta.code.errorcharlogNHI? H I column densitycm**-2phys.columnDensityfloatnullablee_logNHI? rms uncertainty on logNHIcm**-2stat.errorfloatnullablen_logNHI[abc] Note on Components (3)meta.notecharNotDampedNot damped (no logNHI value)meta.codecharJ/ApJ/543/552/table4New Lick/AAT Survey DatarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO namemeta.id;meta.maincharn_QSO[b] Note on QSO (1)meta.notecharRefReference (2)meta.refintRmagR magnitudemagphot.mag;em.opt.RfloatObsObservation campaign (3)meta.id;instr.telcharDateObservation datetime.epochnullableDate2Second date of observationtime.epochnullableExpTimeExposure timestime.duration;obs.exposureintzem? Emission redshiftsrc.redshiftfloatnullablezmin? Minimum redshift valuesrc.redshiftfloatnullablezmax? Maximum redshift valuesrc.redshiftfloatnullablezabs? Absoprtion redshiftsrc.redshiftfloatnullableEWLyA? Ly{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullablelogNHI? HI column densitylog(cm**-2)phys.columnDensityfloatnullablen_logNHI[a] Note on logNHI (4)meta.notecharJ/ApJ/543/552/table5Statistical Sample: QSOs with damped Lyman{alpha} absorbersr_QSOReference code(s) detailed in refs.dat filemeta.refcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO namemeta.id;meta.maincharprimaryzQSO redshiftsrc.redshiftfloatzMinLower redshift limit for detectionsrc.redshiftfloatzMaxUpper redshift limit for detectionsrc.redshiftfloatzAbs? Absorption redshiftsrc.redshiftfloatnullablelog(NHI)? Log of hydrogen column densitylog(cm**-2)phys.columnDensityfloatnullableNote[a] a: Candidatemeta.notecharSimbadSimbad column added by the CDSmeta.refchar_RAPosition (from Simbad) (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition (from Simbad) (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/543/552/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.refintBibCodeBibcodemeta.bib.bibcodecharComAuthors and commentsmeta.notecharJ/ApJ/543/552/table6Statistical sample: QSOs without damped Lyman{alpha} absorbersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO namemeta.id;meta.maincharprimaryzQSO redshiftsrc.redshiftfloatzMinLower redshift limit for detectionsrc.redshiftfloatzMaxUpper redshift limit for detectionsrc.redshiftfloatzAbs? Absorption redshiftsrc.redshiftfloatnullablelog(NHI)? Log of hydrogen column densitylog(cm**-2)phys.columnDensityfloatnullableNote[a] a: Candidatemeta.notecharr_QSOReference code(s) detailed in refs.dat filemeta.refcharSimbadSimbad column added by the CDSmeta.refchar_RAPosition (from Simbad) (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition (from Simbad) (declination part)degpos.eq.dec;meta.mainnullable