J/ApJ/872/81ivo://CDS.VizieR/J/ApJ/872/81doi:10.26093/cds/vizier.18720081CDSWotta C.B.Lehner N.Howk J.C.O'Meara J.M.Oppenheimer B.D.,Cooksey K.L.2022-10-14T13:10:27Z2020-08-26T13:53:36ZCDS support team

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

cds-question@unistra.frspectroscopyultraviolet-astronomyintergalactic-mediumchemical-abundancesredshiftedh-i-line-emissionWe present the results from our COS circumgalactic medium (CGM) compendium (CCC), a survey of the CGM at z<~1 using HI-selected absorbers with 15<logN_HI_<19. We focus here on 82 partial Lyman limit systems (pLLSs, 16.2<=logN_HI_<17.2) and 29 LLSs (17.2<=logN_HI_<19). Using Bayesian techniques and Markov Chain Monte Carlo sampling of a grid of photoionization models, we derive the posterior probability distribution functions (PDFs) for the metallicity of each absorber in CCC. We show that the combined pLLS metallicity PDF at z<~1 has two main peaks at [X/H]~-1.7 and -0.4, with a strong dip at [X/H]~-1. The metallicity PDF of the LLSs might be more complicated than a unimodal or bimodal distribution. The pLLSs and LLSs probe a similar range of metallicities -3<~[X/H]<~+0.4, but the fraction of very metal-poor absorbers with [X/H]<~-1.4 is much larger for the pLLSs than the LLSs. In contrast, absorbers with logN_HI_>=19 have mostly -1<~[X/H]<~0 at z<~1. The metal-enriched gas probed by pLLSs and LLSs confirms that galaxies that have been enriching their CGM over billions of years. Surprisingly, despite this enrichment, there is also abundant metal-poor CGM gas (41%-59% of the pLLSs have [X/H]<~-1.4), representing a reservoir of near-pristine gas around z<~1 galaxies. We compare our empirical results to recent cosmological zoom simulations, finding some discrepancies, including an overabundance of metal- enriched CGM gas in simulations.2019ApJ...872...81Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/872/81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJS/164/1 : IGM absorbers toward HE 0226-4110 (Lehner+, 2006)J/ApJ/636/610 : Damped Ly{alpha} systems at z<1.65 (Rao+, 2006)J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)J/ApJ/676/262 : PKS1302-102 intergalactic absorption system (Cooksey+, 2008)J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 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/736/42 : HST QSO Catalog (Ribaudo+, 2011)J/ApJ/740/91 : Ly{alpha} & OVI in galaxies around QSOs (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/765/137 : HST survey for Lyman limit systems. II. (O'Meara+, 2013)J/MNRAS/445/2061 : Absorption in multiphase circumgal. medium (Liang+, 2014)J/ApJ/794/156 : MgII/FeII absorption profile for z<1.4 gal. (Rubin+, 2014)J/MNRAS/449/3263 : Extended galaxy halo gas through HI and OVI (Johnson+, 2015)J/ApJ/804/79 : HST/COS obs. of QSOs within 600kpc of M31 (Lehner+, 2015)J/ApJ/833/270 : HI-selected-Lyman limit systems (Glidden+, 2016)J/ApJ/833/283 : HI-selected Lyman limit systems (Lehner+, 2016)J/MNRAS/458/4074 : UVES Advanced Data Products QSO Sample. VI. (Quiret+, 2016)J/ApJS/230/6 : HST -COS & -STIS absorption-line spec. II. (Keeney+, 2017)J/MNRAS/471/3428 : Damped Lyman Alpha systems equivalent width (Rao+, 2017)J/A+A/607/A48 : AGN data and absorption-line measurements (Richter+, 2017)J/A+A/606/A71 : dSph RGB abundance and velocities (Skuladottir+, 2017)J/A+A/614/A149 : 417 Gal. bulge red giant O & Zn abund. (da Silveira+, 2018)J/A+A/611/A76 : DLAS dust-corrected metallicity (De Cia+, 2018)J/ApJ/866/33 : The COS CGM compendium. I. Initial results (Lehner+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/872/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/872/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/872/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/872/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/872/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/872/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/872/81/table6 (Metallicities of the partial Lyman limit systems (pLLSs) and LLSs in the COS circumgalactic medium (CGM) Compendium (CCC) sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/872/81/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/872/81/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/872/81/table6?GETtext/xml+votable180.050000true70.0495833-52.8050.0055555555555555566/4193 4204 4646 4959 5291 5657 5759 5841 6081 6224 6488 6553 6644 7337 7460 7557 8282 8702 8910 8923 8927 8952 9175 9440 9457 9482 9783 9872 9912 9987 10297 10305 10379 10389 10517 10602 10659 10764 10865 10940 10976 11101 11312 11340 11456 11530 11723 12752 17703 17730 17990 18601 19327 20010 22659 25472 25742 26088 26303 27084 27160 27230 27250 27254 27423 27509 27526 27542 27720 27727 28083 28356 28546 31658 32682 32961 33796 33950 34210 35205 36313 37385 46143https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/872/81?format=asciiUVRadiodefaultJ/ApJ/872/81/table6Metallicities of the partial Lyman limit systems (pLLSs) and LLSs in the COS circumgalactic medium (CGM) Compendium (CCC) samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNabsNumber of zabs for this sightlinemeta.numberintnullableNameSightline name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryzabs[0.08/1.1] Absorber redshiftsrc.redshiftdoublelogNHI[16.2/19] log HI column densitylog(cm**-2)phys.columnDensityfloate_logNHI[0.01/0.3] logNHI uncertaintylog(cm**-2)stat.errorfloatl_b_[X/H]Limit flag on b_[X/H]meta.code.errorcharb_[X/H][-4.74/0.03] 68% CI lower bound on [X/H]phys.abund;stat.minfloatl_[X/H]Limit flag on [X/H]meta.code.error;phys.abundchar[X/H][-3.75/1.09] Median value of [X/H]phys.abundfloatl_B_[X/H]Limit flag on B_[X/H]meta.code.errorcharB_[X/H][-2.75/2.21] 80% CI upper bound on [X/H]phys.abund;stat.maxfloatb_logU[-4.44/-2.28] 68% CI lower bound on logUphys.ionizParam.rad;stat.minfloatlogU[-4.37/-1.75] Median value of ionization parameter (log U)phys.ionizParam.radfloatu_logU[:] Uncertainty flag on logU (1)meta.code.errorcharB_logU[-4.29/-1.19] 80% CI upper bound on logUphys.ionizParam.rad;stat.maxfloatl_b_[C/a]Limit flag on b_[C/a]meta.code.errorcharb_[C/a][-0.96/0.74]? 68% CI lower bound on [C/a]phys.abund;stat.minfloatnullablel_[C/a]Limit flag on [C/a]meta.code.errorchar[C/a][-0.76/0.9]? Median value of [C/{alpha}]phys.abundfloatnullableu_[C/a][:] Uncertainty flag on [C/a]meta.code.errorcharl_B_[C/a]Limit flag on B_[C/a]meta.code.errorcharB_[C/a][-0.49/0.98]? 80% CI upper bound on [C/a]phys.abund;stat.maxfloatnullableFig24[1/82]? Absorber identification number on Figure 24 (82 images); column added by CDSmeta.bib.figintnullableFig26[1/29]? Absorber identification number on Figure 26 (29 images); column added by CDSmeta.bib.figintnullablePapIData from Paper I (Lehner+, 2018, J/ApJ/866/33)meta.ref.urlintnullableNmcmcNumber of MCMC inputs for this pLLS or LLS (link to Table 9 and Table 10, respectively)meta.numberintnullableSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPositions from names (right ascension part)degpos.eq.ra;meta.main_DEPositions from names (declination part)degpos.eq.dec;meta.mainJ/ApJ/872/81/table9Summary of the MCMC inputs for the 82 pLLSs (16.2<=logN_HI_<17.2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSightline name (JHHMMSS.ss+DDMMSS.s)meta.id.part;meta.maincharIDIdentifier (z{zabs} within Name)meta.id.part;meta.maincharzabs[0.08/1.1] Redshift from absorption in Ionsrc.redshiftdoublee_zabs[1e-06/0.001] Uncertainty in zabsstat.errordoubleIonIon identifierphys.atmol.ionStagecharlogN[11/19] log column density in Ionlog(cm**-2)phys.columnDensityfloate_logN[0.01/0.6] Uncertainty in logNlog(cm**-2)stat.errorfloatFlag[-3/0]? Detection flag code (1)meta.code.errorintnullableJ/ApJ/872/81/table10Summary of the MCMC inputs for the 29 LLSs (17.2<=logN_HI_<19)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSightline name (JHHMMSS.ss+DDMMSS.s)meta.id.part;meta.maincharIDIdentifier (z{zabs} within Name)meta.id.part;meta.maincharzabs[0.08/1.1] Redshift from absorption in Ionsrc.redshiftdoublee_zabs[1e-06/0.001] Uncertainty in zabsstat.errordoubleIonIon identifierphys.atmol.ionStagecharlogN[11/19] log column density in Ionlog(cm**-2)phys.columnDensityfloate_logN[0.01/0.6] Uncertainty in logNlog(cm**-2)stat.errorfloatFlag[-3/0]? Detection flag code (1)meta.code.errorintnullable