J/ApJ/883/78ivo://CDS.VizieR/J/ApJ/883/78doi:10.26093/cds/vizier.18830078CDSPointon S.K.Kacprzak G.G.Nielsen N.M.Muzahid S.Murphy M.T.,Churchill C.W.Charlton J.C.2021-05-03T08:59:08Z2021-03-22T11:39:33ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyquasarshst-photometryultraviolet-astronomyredshiftedvisible-astronomyintergalactic-mediumWe investigate the geometric distribution of gas metallicities in the circumgalactic medium (CGM) around 47, z<0.7 galaxies from the "Multiphase Galaxy Halos" Survey. Using a combination of quasar spectra from Hubble Space Telescope (HST)/COS and from Keck/HIRES or Very Large Telescope/UVES, we measure column densities of, or determine limits on, CGM absorption lines. We then use a Markov Chain Monte Carlo approach with Cloudy to estimate the metallicity of cool (T~10^4^K) CGM gas. We also use HST images to determine host-galaxy inclination and quasar-galaxy azimuthal angles. Our sample spans a HI column density range of 13.8cm^-2^<logN_HI_<19.9cm^-2^. We find (1) while the metallicity distribution appears bimodal, a Hartigan dip test cannot rule out a unimodal distribution (0.4{sigma}). (2) CGM metallicities are independent of halo mass, spanning three orders of magnitude at a fixed halo mass. (3) The CGM metallicity does not depend on the galaxy azimuthal and inclination angles regardless of HI column density, impact parameter, and galaxy color. (4) The ionization parameter does not depend on azimuthal angle. We suggest that the partial Lyman limit metallicity bimodality is not driven by a spatial azimuthal bimodality. Our results are consistent with simulations where the CGM is complex and outflowing, accreting, and recycled gas are well-homogenized at z<0.7. The presence of low-metallicity gas at all orientations suggests that cold streams of accreting filaments are not necessarily aligned with the galaxy plane at low redshifts or intergalactic transfer may dominate. Finally, our results support simulations showing that strong metal absorption can mask the presence of low-metallicity gas in integrated line-of-sight CGM metallicities.2019ApJ...883...78Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/883/78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJ/508/200 : QSO low-z Ly{alpha} absorbers (Tripp+, 1998)J/ApJ/559/654 : Ly{alpha} absorption systems. V. (Chen+, 2001)J/ApJS/142/1 : DEEP Groth Strip Survey. II. (Simard+, 2002)J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)J/ApJ/676/262 : PKS1302-102 intergalactic absorption system (Cooksey+, 2008)J/ApJ/724/L176 : MgII absorbing gas around galaxies (Chen+, 2010)J/ApJ/710/613 : Broad HI absorbers (Danforth+, 2010)J/ApJ/740/91 : Ly{alpha} and OVI in gal. around quasars (Prochaska+, 2011)J/MNRAS/423/2690 : Sample of Compact Group (CG) galaxies (Scudder+, 2012)J/ApJ/759/112 : The UV low-redshift intergalactic medium (Tilton+, 2012)J/ApJ/779/87 : MAGIICAT. III. Virial masses (Churchill+, 2013)J/A+A/550/A115 : Oxygen abundances and properties of galaxies (Hughes+, 2013)J/MNRAS/434/1765 : Catalog of galaxies around PKS 0405-123 (Johnson+, 2013)J/ApJ/770/138 : Metallicities of Lyman limit systems and DLA (Lehner+, 2013)J/ApJ/776/114 : MAGIICAT. I. MgII Absorber-Galaxy Catalog (Nielsen+, 2013)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/866/33 : The COS CGM compendium. I. Initial results (Lehner+, 2018)J/ApJ/872/81 : The COS CGM Compendium. II. Lyman limit syst. (Wotta+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/883/78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/883/78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/883/78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/883/78https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/883/78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/883/78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/883/78/table1 (Quasar observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/883/78/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/883/78/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/883/78/table1?GETtext/xml+votable180.050000true21.3701667-0.09886940.005555555555555556Cone search capability for table J/ApJ/883/78/table2 (Galaxy observations and properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/883/78/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/883/78/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/883/78/table2?GETtext/xml+votable180.050000true21.36529583-0.092052780.0055555555555555566/4961 5262 5861 7176 8641 8858 9756 10217 10298 11021 11209 11217 18005 20099 21126 22659 25472 26017 26259 27006 27376 27423 27526 27720 27964 28356 36313 48614 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/883/78?format=asciiUVOpticaldefaultJ/ApJ/883/78/table1Quasar observationsSimbadNameSimbad column added by the CDSmeta.idcharIDTruncated JName (JHHMM)meta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNgNumber of galaxies around this quasar (link to Table 2)meta.numberintnullablezQSO[0.17/1.3] Redshift of the quasarsrc.redshift;pos.heliocentricfloatRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainGratingCOS grating(s)meta.id;instrcharPIDHST/COS program identifier(s)meta.id;obscharInstOptical spectrographmeta.id;instrcharOptOptical program identifier(s)meta.id;obscharf_Opta: Spectra from Churchill & Vogt (2001AJ....122..679C)meta.codecharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharJ/ApJ/883/78/table2Galaxy observations and propertiesSimbadNameSimbad column added by the CDSmeta.idchartheta[4.3/89.6] Azimuthal angle {theta} (2)degpos.posAngfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDTruncated JName (JHHMM)meta.idcharzGal[0.07/0.7] Redshift of the galaxysrc.redshift;pos.heliocentricdoubleRef[1/9] Reference (1)meta.ref;pos.frameintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainDist[21.1/203.2] Distancekpcpos.distance;pos.heliocentricfloate_Dist[0.1/5.3] Dist uncertaintykpcstat.errorfloatB-K[0.3/2.81]? B-K colour indexmagphot.color;em.opt.B;em.IR.Kfloatnullablee_theta[0.1/67.2] Theta downwards uncertainty (3)degstat.error;pos.posAngfloatE_theta[0.1/33] Theta upwards uncertainty (3)degstat.error;stat.maxfloatf_thetaFlag on thetameta.codecharInc[0.1/85] Inclination angle (i=0{deg}: face-on galaxies; i=90{deg}: edge-on galaxies)degsrc.orbital.inclinationfloate_Inc[0.1/22] Inc downwards uncertaintydegstat.errorfloatE_Inc[0.1/20] Inc upwards uncertaintydegstat.error;stat.maxfloatlogMh[10.7/12.6] Log of halo mass (logM_h_/M_{sun}_)log(solMass)phys.massfloate_logMh[0.15/0.22] LogMh downwards uncertaintylog(solMass)stat.errorfloatE_logMh[0.16/0.63] LogMh upwards uncertaintylog(solMass)stat.error;stat.maxfloatFiltHST filtermeta.notecharCamHST camerameta.id;instrcharExp[600/2256] Exposure timestime.duration;obs.exposureintPID[5098/13024] HST program identifiermeta.id;obsintJ/ApJ/883/78/table3Measured column densitiesIonIon identifierphys.atmol.ionStagecharl_logNLimit flag on logNmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDTruncated JName (JHHMM)meta.idcharz[0.07/0.7] Galaxy redshiftsrc.redshift;pos.heliocentricdoublelogN[10.6/20] log column density (1)log(cm**-2)phys.columnDensityfloatuplogN[17.2/19]? Upper limit on logN (1)log(cm**-2)phys.columnDensity;stat.maxfloatnullablee_logN[0.01/3]? Uncertainty in logNlog(cm**-2)stat.errorfloatnullable