J/ApJ/740/91ivo://CDS.VizieR/J/ApJ/740/91doi:10.26093/cds/vizier.17400091CDSProchaska J.X.Weiner B.Chen H.-W.Mulchaey J.Cooksey K.2017-11-28T13:21:58Z2013-03-12T17:06:03ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyultraviolet-astronomyquasarsredshiftedline-intensitiesWe analyze the association of galaxies with Ly{alpha} and OVI absorption, the most commonly detected transitions of the low-z intergalactic medium (IGM), in the fields of 14 quasars with z_em_=0.06-0.57. Confirming previous studies, we observe a high covering fraction for Ly{alpha} absorption to impact parameter {rho}=300h^-1^_72_kpc: 33/37 of our L>0.01L* galaxies show Ly{alpha} equivalent width W^Ly{alpha}^>=50 m{AA}. Galaxies of all luminosity L>0.01L* and spectral type are surrounded by a diffuse and ionized circumgalactic medium (CGM), whose baryonic mass is estimated at ~10^10.5^+/-0.3M_{sun}_ for a constant N_H_=10^19^cm^-2^. The virialized halos and extended CGM of present-day galaxies are responsible for most strong Ly{alpha} absorbers (W^Ly{alpha}^>300m{AA}) but cannot reproduce the majority of observed lines in the Ly{alpha} forest. We conclude that the majority of Ly{alpha} absorption with W^Ly{alpha}^=30-300m{AA} occurs in the cosmic web predicted by cosmological simulations and estimate a characteristic width for these filaments of ~400h^-1^_72_kpc. Regarding OVI, we observe a near unity covering fraction to {rho}=200h^-1^_72_kpc for L>0.1L* galaxies and to {rho}=300h^-1^_72_kpc for sub-L* (0.1 L*<L<L*) galaxies. Similar to our Ly{alpha} results, stronger OVI systems (W^1031^>70m{AA}) arise in the virialized halos of L>0.1L* galaxies. Unlike Ly{alpha}, the weaker OVI systems (W^1031^~30m{AA}) arise in the extended CGM of sub-L* galaxies. The majority of OVI gas observed in the low-z IGM is associated with a diffuse medium surrounding individual galaxies with L~0.3L* and rarely originates in the so-called warm-hot IGM (predicted by cosmological simulations.2011ApJ...740...91Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/740/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011)J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)J/ApJ/701/1219 : Galaxy survey in 3 QSO fields (Chen+, 2009)J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)J/ApJ/679/194 : Low-z intergalactic medium. III. (Danforth+, 2008)J/ApJ/676/262 : PKS1302-102 intergalactic absorption system (Cooksey+, 2008)J/ApJ/643/680 : Imaging & spectroscopy around PKS 0405-123 (Prochaska+, 2006)J/ApJ/617/718 : Atomic data and EW for PKS 0405-123 (Prochaska+, 2004)J/ApJ/559/654 : Ly{alpha} absorption systems. V. (Chen+, 2001)J/ApJ/498/77 : Ly{alpha} absorption systems. III. (Chen+, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/740/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/740/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/740/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/740/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/740/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/740/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/740/91/table1 (Fields analyzed from WFCCD spectrometer at Las Campanas Observatory)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/740/91/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/740/91/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/740/91/table1?GETtext/xml+votable180.050000true7.307513.2677780.005555555555555556Cone search capability for table J/ApJ/740/91/table8 (Galaxies within 1Mpc of a QSO sightline)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/740/91/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/740/91/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/740/91/table8?GETtext/xml+votable180.050000true7.288833313.27458330.0055555555555555566/16671 18601 18604 19746 22659 22662 22665 22668 25742 25743 25965 26292 26293 26650 27580 27720 27721 27862 28356 32961 47014https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/740/91?format=asciiUVOpticaldefaultJ/ApJ/740/91/table1Fields analyzed from WFCCD spectrometer at Las Campanas ObservatorySimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldQuasar namemeta.id;meta.maincharprimaryRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainzemEmission redshiftsrc.redshiftfloatSetHST UV spectroscopic data setsmeta.id;obscharFUSE? Total FUSE integration time (Cat. VI/129)kstime.epochintnullableLyaLy{alpha} reference(s) (G1)meta.bibcharOVIOVI reference(s) (G1)meta.bibcharNgNumber of galaxies in this field (table 8)meta.numberintnullableNsp? Number of spectroscopically determined galaxy redshifts for objects with 0.005<z<zemmeta.numberintnullableP4Details from the Paper-IV for this fieldmeta.ref.urlcharNEDSimbad column added by the CDSmeta.refcharJ/ApJ/740/91/table8Galaxies within 1Mpc of a QSO sightlinerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identificationobs.fieldcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzgalGalaxy redshift (1)src.redshiftfloatrhoImpact parameter (1)kpcsrc.impactParamintL/L*Luminosity of the galaxyphys.luminosity;arith.ratiofloatzabsL? The Ly{alpha} absorption redshiftsrc.redshift;pos.heliocentricfloatnullablel_WLyaLimit flag on WLyameta.code.errorcharWLya? Equivalent width of Ly{alpha} (in m{AA})1e-13mspect.line.eqWidthintnullablel_NHILimit flag on NHImeta.code.errorcharNHI? Log of H I column densitylog(cm**-2)phys.columnDensityfloatnullabler_NHI? Reference for NHI (G1)meta.ref;pos.frameintnullablezabsO? The O.VI absorption redshiftsrc.redshift;pos.heliocentricfloatnullablel_WOVILimit flag on WOVImeta.code.errorcharWOVI? Equivalent width of O VI; milli-Angstroms1e-13mspect.line.eqWidthintnullablel_NOVILimit flag on NOVImeta.code.errorcharNOVI? Log of O VI column densitylog(cm**-2)phys.columnDensityfloatnullabler_NOVI? Reference for NOVI (G1)meta.ref;pos.frameintnullable