J/ApJ/721/1ivo://CDS.VizieR/J/ApJ/721/1doi:10.26093/cds/vizier.17210001CDSPenprase B.E.Prochaska J.X.Sargent W.L.W.Toro-Martinez I.,Beeler D.J.2017-10-16T14:58:09Z2012-07-31T15:18:07ZCDS support team

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

cds-question@unistra.frchemical-abundancesquasarsredshiftedspectroscopyWe present the first results from a survey of SDSS quasars selected for strong HI damped Ly{alpha} (DLA) absorption with corresponding low equivalent width absorption from strong low-ion transitions (e.g., CII{lambda}1334 and SiII{lambda}1260). These metal-poor DLA candidates were selected from the SDSS fifth release quasar spectroscopic database, and comprise a large new sample for probing low-metallicity galaxies. Medium-resolution echellette spectra from the Keck Echellette Spectrograph and Imager spectrograph for an initial sample of 35 systems were obtained to explore the metal-poor tail of the DLA distribution and to investigate the nucleosynthetic patterns at these metallicities. We have estimated saturation corrections for the moderately underresolved spectra, and systems with very narrow Doppler parameters (b<=5km/s) will likely have underestimated abundances. For those systems with Doppler parameters b>5km/s, we have measured low-metallicity DLA gas with [X/H]<-2.4 for at least one of C, O, Si, or Fe. Assuming non-saturated components, we estimate that several DLA systems have [X/H]<-2.8, including five DLA systems with both low equivalent widths and low metallicity in transitions of both CII and OI. All of the measured DLA metallicities, however, exceed or are consistent with a metallicity of at least 1/1000 of solar, regardless of the effects of saturation in our spectra.2010ApJ...721....1Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/721/1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/675/1002 : Proximate damped Ly{alpha} systems in SDSS-DR5 (Prochaska+,J/ApJ/683/321 : Metallicities of GRB, DLA, and Ly{alpha} galaxies (Fynbo+,J/A+A/478/701 : Color excess of SDSS QSOs with DLA systems (Vladilo+, 2008)J/ApJS/171/29 : UCSD/Keck DLA Database (Prochaska+, 2007)J/ApJ/635/123 : The SDSS-DR3 damped Ly{alpha} survey (Prochaska+, 2005)J/MNRAS/354/L31 : SDSS DR2 QSO and DLA properties (Murphy+, 2004)J/ApJ/543/552 : z>3 damped Ly{alpha} absorption systems (Storrie-Lombardi+,https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/721/1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/721/1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/721/1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/721/1https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/721/1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/721/1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/721/1/table1 (SDSS-DR5 metal-poor DLA candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/721/1/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/721/1/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/721/1/table1?GETtext/xml+votable180.050000true2.813458314.76694440.005555555555555556Cone search capability for table J/ApJ/721/1/table2 (Targets observed, magnitudes, and exposure times)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/721/1/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/721/1/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/721/1/table2?GETtext/xml+votable180.050000true117.80437531.3436110.0055555555555555566/4149 4162 4176 4186 4187 4192 4204 4234 4238 4242 4249 4360 4361 4604 4717 4729 4734 4747 4794 4795 4800 4862 4904 4916 4923 4949 4979 5016 5038 5048 5051 5058 5094 5098 5119 5209 5221 5228 5229 5246 5289 5333 5375 5401 5448 5496 5515 5548 5565 5577 5578 5587 5617 5627 5643 5651 5712 5714 5723 5731 5752 5787 5802 5804 5826 5851 5857 5864 5874 5894 5918 5929 5931 5944 5945 5973 5975 6033 6059 6071 6094 6133 6205 6232 6238 6244 6254 6258 6354 6357 6385 6415 6416 6418 6455 6459 6478 6486 6491 6500 6501 6543 6582 6598 6644 6645 7168 7202 7262 7266 7284 7305 7308 7367 7424 7447 7451 7455 7464 8228 8324 8354 8361 8394 8657 8722 8737 8830 9082 9141 9144 9168 9198 9203 9210 9222 9241 9250 9282 9285 9302 9311 9314 9334 9335 9342 9343 9345 9359 9389 9401 9412 9413 9416 9460 9462 9508 9615 9634 9732 9735 9754 9789 9843 9871 9885 9893 9902 9905 9909 9914 9932 9962 9967 9994 10182 10212 10261 10337 10383 10401 10455 10495 10512 10555 10564 10586 10594 10600 10601 10611 10612 10641 10683 10694 10709 10744 10769 10790 10829 10835 10856 10857 10858 10867 10905 10930 10931 10933 10936 10940 10949 10991 11016 11025 11027 11030 11036 11037 11043 11061 11084 11090 11115 11129 11136 11146 11157 11163 11172 11174 11181 11188 11198 11211 11256 11267 11269 11278 11293 11314 11357 11361 11368 11392 11397 11398 11422 11432 11451 11784 11791 11794 11798 11814 11823 11842 11873 11880 11881 11945 11952 17295 17320 17510 18007 18407 18538 18749 18767 19028 19202 19326 19408 19409 19411 19416 19667 19676 19679 19692 19757 20010 21847 21976 22003 22006 23054 25823 25844 25938 25953 25967 25986 25993 26013 26031 26041 26080 26088 26095 26100 26187 26327 26330 26494 26547 26551 26568 26574 26592 26593 26943 26992 27037 27074 27099 27348 27376 27378 27396 27439 27450 27459 27463 27464 27473 27497 27517 27561 27572 27581 27590 27599 27654 27737 27748 27749 27762 27826 27836 27843 27858 27860 27874 27881 27882 27947 28034 28160 28171 28174 28187 28201 28208 28542 28607 31629 31652 32438 32511 36725 36734 490192.762881831355591e-19 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/721/1?format=asciiOpticaldefaultJ/ApJ/721/1/table14Column densities for the species CIV and SiIVrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar designation (HHMM+DDMM; J2000) (G1)meta.id;meta.maincharzDLADLA redshiftsrc.redshiftfloatlogNHILog of HI column densitylog(cm**-2)phys.columnDensityfloatl_logNCIVLimit flag on logNCIVmeta.code.errorcharlogNCIVLog of CIV column densitylog(cm**-2)phys.columnDensityfloate_logNCIV? logNCIV uncertaintylog(cm**-2)stat.errorfloatnullablel_logNSiIVLimit flag on logNSiIVmeta.code.errorcharlogNSiIV? Log of SiIV column densitylog(cm**-2)phys.columnDensityfloatnullablee_logNSiIV? logNSiIV uncertaintylog(cm**-2)stat.errorfloatnullableJ/ApJ/721/1/table1SDSS-DR5 metal-poor DLA candidatesSDSSSDSS-DR7 IAU name of the QSO (1)meta.id;meta.maincharQSOQSO designation as in other tablesmeta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintASimbad column added by the CDSmeta.ref.urlcharzabsAbsorption redshiftsrc.redshiftfloatlogNHILog of the HI column densitylog(cm**-2)phys.columnDensityfloatDR7+8Link to data from SDSS-DR7 and -DR8 photometric catalogsmeta.ref.urlcharSloanDisplay the SDSS online data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS name (declination part)degpos.eq.dec;meta.mainJ/ApJ/721/1/table2Targets observed, magnitudes, and exposure timesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar designation (HHMM+DDMM; J2000) (G1)meta.id;meta.maincharzDLADLA redshiftsrc.redshiftfloatRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainRmagR-band magnitudemagphot.mag;em.opt.RfloatExp08? Exposure time (2008)stime.duration;obs.exposureintnullableExp07? Exposure time (2007)stime.duration;obs.exposureintnullableJ/ApJ/721/1/table13Elemental abundances for DLA systemszDLADLA redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQuasar designation (HHMM+DDMM; J2000) (G1)meta.id;meta.maincharlogNHILog of HI column densitylog(cm**-2)phys.columnDensityfloate_logNHIlogNHI uncertaintylog(cm**-2)stat.errorfloatl_[C/H]Limit flag on [C/H]meta.code.error;phys.abundchar[C/H]? Abundance [C/H]phys.abundfloatnullablef_[C/H][abc] Flag on [C/H]meta.codecharl_[O/H]Limit flag on [O/H]meta.code.error;phys.abundchar[O/H]? Abundance [O/H]phys.abundfloatnullablef_[O/H][abc] Flag on [O/H]meta.codecharl_[Si/H]Limit flag on [Si/H]meta.code.error;phys.abundchar[Si/H]? Abundance [Si/H]phys.abundfloatnullablef_[Si/H][abc] Flag on [Si/H]meta.codecharl_[Al/H]Limit flag on [Al/H]meta.code.error;phys.abundchar[Al/H]? Abundance [Al/H]phys.abundfloatnullablef_[Al/H][abc] Flag on [Al/H]meta.codecharl_[Fe/H]Limit flag on [Fe/H]meta.code.error;phys.abund.Fechar[Fe/H]? Abundance [Fe/H]phys.abundfloatnullablef_[Fe/H][abc] Flag on [Fe/H]meta.codecharl_[Mg/H]Limit flag on [Mg/H]meta.code.error;phys.abundchar[Mg/H]? Abundance [Mg/H]phys.abundfloatnullablef_[Mg/H][abc] Flag on [Mg/H]meta.codechar