J/ApJ/866/33ivo://CDS.VizieR/J/ApJ/866/33doi:10.26093/cds/vizier.18660033CDSLehner N.Wotta C.B.Howk J.C.O'Meara J.M.Oppenheimer B.D.,Cooksey K.L.2021-01-25T10:57:38Z2019-10-23T13:24:47ZCDS support team

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

cds-question@unistra.frh-i-line-emissionactive-galactic-nucleiquasarsspectroscopyultraviolet-astronomyredshiftedchemical-abundancesWe present a neutral hydrogen-selected absorption-line survey of gas with HI column densities 15<logN_HI_<19 at z<~1 using the Cosmic Origins Spectrograph on the Hubble Space Telescope. Our main aim is to determine the metallicity distribution of these absorbers. Our sample consists of 224 absorbers selected on the basis of their HI absorption strength. Here we discuss the properties of our survey and the immediate empirical results. We find singly and doubly ionized metal species, and HI typically have similar velocity profiles, implying they probe gas in the same or similar environments. The ionic ratios (e.g., N_CII_/N_CIII_, N_OI_/N_CII_) indicate that the gas in these absorbers is largely ionized, and the ionization conditions are quite comparable across the sampled N_HI_ range. The Doppler parameters of the HI imply T<~5x10^4^K on average, consistent with the gas being photoionized. The MgII column densities span >2 orders of magnitude at any given N_HI_, indicating a wide range of metallicities (from solar to <1/100 solar). In the range of 16.2<~logN_HI_<~17, there is a gap in the N_MgII_ distribution corresponding to gas with ~10% solar metallicity, consistent with the gap seen in the previously identified bimodal metallicity distribution in this column density regime. Less than 3% of the absorbers in our sample show no detectable metal absorption, implying that truly pristine gas at z<~1 is uncommon. We find <[FeII/MgII]>=-0.4+/-0.3, and since {alpha}-enhancement can affect this ratio, dust depletion is extremely mild.2018ApJ...866...33Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/866/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/A+AS/108/287 : Atomic data (Verner+, 1994)J/ApJS/136/463 : Distances and metallicities of HVCs and IVCs (Wakker, 2001)J/ApJ/651/61 : Optically thick absorbers near luminous QSOs (Hennawi+, 2006)J/ApJ/676/262 : PKS1302-102 intergalactic absorption system (Cooksey+, 2008)J/ApJ/700/1299 : Gas-phase element depletions in the ISM (Jenkins, 2009)J/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011)J/ApJ/740/91 : Ly{alpha} & OVI in galaxies around quasars (Prochaska+, 2011)J/ApJ/755/89 : Metallicities of damped Ly{alpha} systems (Rafelski+, 2012)J/ApJ/770/138 : Metallicities of Lyman limit systems and DLA (Lehner+, 2013)J/ApJ/776/136 : QPQ VI. HI absorption of z~2 quasars (Prochaska+, 2013)J/ApJ/788/119 : Highly ionized gas properties of quasars (Lehner+, 2014)J/ApJ/794/156 : MgII/FeII absorption profile for 0.3<z<1.4 gal. (Rubin+, 2014)J/ApJ/794/75 : HST-COS UV spectra observations of AGNs (Stevans+, 2014)J/MNRAS/437/2017 : HI-galaxy cross-correlation at z<~1 (Tejos+, 2014)J/ApJ/804/79 : HST/COS obs. of QSOs within 600kpc of M31 (Lehner+, 2015)J/AJ/150/111 : KODIAQ DR1 (O'Meara+, 2015)J/ApJ/814/40 : Nearby galaxy filaments with UV obs. (Wakker+, 2015)J/ApJ/817/111 : HST/COS survey of z<0.9 AGNs. I. (Danforth+, 2016)J/ApJ/833/270 : HI-selected-Lyman limit system metallicities (Glidden+, 2016)J/ApJ/833/283 : HI-selected Lyman limit systems metallicities (Lehner+, 2016)J/MNRAS/458/4074 : UVES Advanced Data Products QSO Sample. VI. (Quiret+, 2016)J/ApJS/230/6 : HST -COS & -STIS abs. spectroscopy. II. (Keeney+, 2017)J/AJ/154/114 : KODIAQ DR2 (O'Meara+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/866/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/866/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/866/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/866/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/866/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/866/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/866/33/table1 (targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/866/33/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/866/33/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/866/33/table1?GETtext/xml+votable180.050000true0.10175-12.763250.0055555555555555566/0 526 552 2245 2409 2414 2663 4107 4193 4204 4256 4328 4410 4506 4515 4590 4820 4821 4824 4946 4959 4961 4966 5061 5117 5121 5156 5215 5249 5262 5274 5284 5304 5305 5345 5371 5409 5413 5481 5529 5570 5639 5657 5687 5696 5731 5757 5759 5773 5814 5817 5820 5821 5860 5861 5881 5929 5950 5974 6021 6081 6087 6104 6223 6488 6557 6606 7176 7254 7381 7426 7448 7460 7505 7508 7896 7902 7903 8245 8246 8266 8282 8303 8328 8392 8465 8469 8641 8702 8755 8858 8867 8910 8918 8923 8927 8952 9019 9031 9111 9146 9151 9175 9186 9440 9457 9604 9753 9756 9783 9817 10191 10261 10287 10297 10298 10300 10325 10376 10379 10408 10411 10418 10433 10468 10472 10500 10517 10528 10601 10602 10624 10634 10659 10764 10878 10889 10940 10969 10976 11014 11021 11086 11096 11101 11209 11217 11327 11396 11424 11425 11435 11456 11462 11475 11530 11557 11610 11658 11686 11777 11781 12047 12317 12752 15351 16894 17186 17203 17251 17488 17673 17703 17730 17772 17898 17990 18005 18125 18409 18601 18769 18770 19147 19416 19700 19841 20008 20099 21126 21991 22659 23060 25132 25392 25472 25742 25932 25978 26017 26058 26065 26088 26238 26245 26259 26292 26313 26334 26396 26606 26965 27006 27023 27065 27084 27090 27096 27115 27116 27160 27229 27250 27256 27259 27338 27376 27410 27423 27435 27486 27509 27513 27514 27515 27516 27518 27526 27542 27580 27607 27715 27720 27722 27723 27725 27727 27728 27733 27745 27751 27755 27758 27760 27766 27797 27834 27849 27902 27911 27964 28034 28083 28117 28118 28143 28158 28180 28201 28232 28356 28383 28395 28401 28468 28527 28546 28564 28571 28589 28607 28636 30071 31405 31535 31658 31663 32948 33796 33950 34210 35180 35205 35741 35743 35934 35935 35987 35992 35993 36313 36443 36788 36802 37385 38383 42666 45341 46143 46299 46555 46647 46795 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/866/33?format=asciiUVRadiodefaultJ/ApJ/866/33/table1targetsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNvHINumber of column density measurements for this source (link to Table 3)meta.numberintnullableNameIdentifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryHSTName used in HST observation (1)meta.idcharz[0.17/1.5] Spectroscopic redshift from emission linessrc.redshiftdoubleMin[1066/1431] Minimum wavelength of spectral coverage; in Angstrom units0.1nmem.wl;stat.minfloatMax[1367/1802] Maximum wavelength of spectral coverage; in Angstrom units0.1nmem.wl;stat.maxfloatSNR[1/105.7] Signal-to-Noise (2)stat.snrfloatPIDHST observation number identifier(s)meta.id;obscharNabsNumber of absorbers (3)meta.numbercharNdNumber of measurements for the absorber(s) (link to Table 9)meta.numberintnullableInstGround observation instrument (4)instr;obscharL13Display data from Lehner+, 2013 (J/ApJ/770/138) within 1"meta.ref.urlintnullableNvL13Number of column density measurements from L13 for this source (link to Table 4)meta.numberintnullableNEDNED column added by the CDSmeta.ref.urlchar_RAPosition from Identifiers (col. Name) (right ascension part)degpos.eq.ra;meta.main_DEPosition from Identifiers (col. Name) (declination part)degpos.eq.dec;meta.mainJ/ApJ/866/33/table2Atomic parameters and abundances for the surveyed atoms and ionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpSpecies identifier sorted in decreasing order of abundancesphys.atmol.ionStagecharlambda[608.3/2803.6] Wavelength; Angstroms0.1nmem.wldoublelog(lf)[-0.7/3.3] log wavelength * oscillator strength (log{lambda}f)phys.atmol.oscStrengthfloatA[7.14/12.0] Solar abundance from Asplund+ (2009ARA&A..47..481A)log(Sun)phys.abundfloatFlag[1/5] Ionization flag (1)meta.code.errorintJ/ApJ/866/33/table3Average velocities and column densities of the metal ions in the weak HI absorbersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.09/0.9] Spectroscopic redshift of the absorbersrc.redshiftdoubleLineSpecies and wavelength (Angstroms) of line (1)meta.id;spect.linev1[-312/-3]? Lower rest frame velocity (2)km/sinstr.bandwidthintnullablev2[1/270]? Upper rest frame velocity (2)km/sinstr.bandwidthintnullableVel[-44/62.3]? Average velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_Vel[0.1/79]? Uncertainty in Velkm/sstat.errorfloatnullablel_logNLimit flag on logN (3)meta.code.errorcharlogN[10.8/19]? Log column density of linelog(cm**-2)phys.columnDensity;spect.linefloatnullableE_logN[0.01/0.5]? Upper uncertainty in logNlog(cm**-2)stat.error;stat.maxfloatnullablee_logN[0.01/0.7]? Lower uncertainty in logNlog(cm**-2)stat.errorfloatnullableJ/ApJ/866/33/table4Average velocities and column densities of the metal ions from the L13 (Lehner+, 2013, J/ApJ/770/138) samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.09/0.9] Spectroscopic redshift of the absorbersrc.redshiftdoubleLineSpecies and wavelength (Angstroms) of line (1)meta.id;spect.linev1[-312/-3]? Lower rest frame velocity (2)km/sinstr.bandwidthintnullablev2[1/270]? Upper rest frame velocity (2)km/sinstr.bandwidthintnullableVel[-44/62.3]? Average velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_Vel[0.1/79]? Uncertainty in Velkm/sstat.errorfloatnullablel_logNLimit flag on logN (3)meta.code.errorcharlogN[10.8/19]? Log column density of linelog(cm**-2)phys.columnDensity;spect.linefloatnullableE_logN[0.01/0.5]? Upper uncertainty in logNlog(cm**-2)stat.error;stat.maxfloatnullablee_logN[0.01/0.7]? Lower uncertainty in logNlog(cm**-2)stat.errorfloatnullableJ/ApJ/866/33/table9ResultsSpSpecies identifierphys.atmol.ionStagechare_z[1e-5/0.0008] Uncertainty in zstat.error;src.redshiftdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharHSTName used in HST observationmeta.idcharz[0.09/0.9] Spectroscopic redshift of the absorbersrc.redshiftdoublev1[-312/999] Minimum integration range velocity (1)km/sinstr.bandwidthfloatv2[1/999] Maximum integration range velocity (1)km/sinstr.bandwidthfloatVel[-66.7/999] Average velocity (1)km/sphys.veloc;pos.heliocentricfloate_Vel[0.2/999] Uncertainty in Vel (1)km/sstat.errorfloatlogN[10.8/19] log column densitylog(cm**-2)phys.columnDensityfloatE_logN[0.01/0.3] Upper uncertainty on logNlog(cm**-2)stat.error;stat.maxfloate_logN[0.01/0.7] Lower uncertainty on logNlog(cm**-2)stat.errorfloatDet[-2/0]? Detection flag (2)meta.code.errorintnullableRel[1/3] Reliability flag (3)meta.codeintUniq[1/224] Unique identification number of absorbermeta.idint