J/ApJ/853/95ivo://CDS.VizieR/J/ApJ/853/95doi:10.26093/cds/vizier.18530095CDSRubin K.H.R.Diamond-Stanic A.M.Coil A.L.Crighton N.H.M.Moustakas J.2022-07-25T09:33:30Z2018-12-03T15:33:19ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyintergalactic-mediumredshiftedline-intensitiesabsolute-magnitudeactive-galactic-nucleiThe spectroscopy of background QSO sightlines passing close to foreground galaxies is a potent technique for studying the circumgalactic medium (CGM). However, QSOs are effectively point sources, limiting their potential to constrain the size of circumgalactic gaseous structures. Here we present the first large Keck/Low-resolution Imaging Spectrometer (LRIS) and Very Large Telescope (VLT)/Focal Reducer/Low-dispersion Spectrograph 2 (FORS2) spectroscopic survey of bright (B_AB_<22.3) background galaxies whose lines of sight probe MgII{lambda}{lambda}2796,2803 absorption from the CGM around close projected foreground galaxies at transverse distances 10kpc<R_{perp}_<150kpc. Our sample of 72 projected pairs, drawn from the PRIsm MUlti-object Survey, includes 48 background galaxies that do not host bright active galactic nuclei, and both star-forming and quiescent foreground galaxies with stellar masses of 9.0<logM_*_/M_{sun}_<11.2 at redshifts of 0.35<z_f/g_<0.8. We detect MgII absorption associated with these foreground galaxies with equivalent widths of 0.25{AA}<W_2796_<2.6{AA} at >2{sigma} significance in 20 individual background sightlines passing within R_{perp}_<50kpc and place 2{sigma} upper limits on W_2796_ of <~0.5{AA} in an additional 11 close sightlines. Within R_{perp}_<50kpc, W_2796_ is anticorrelated with R_{perp}_, consistent with analyses of Mg ii absorption detected along background QSO sightlines. Subsamples of these foreground hosts divided at logM_*_/M_{sun}_=9.9 exhibit statistically inconsistent W_2796_ distributions at 30kpc<R_{perp}_<50kpc, with the higher-M* galaxies yielding a larger median W_2796_ by 0.9{AA}. Finally, we demonstrate that foreground galaxies with similar stellar masses exhibit the same median W_2796_ at a given R_{perp}_ to within <0.2{AA} toward both background galaxies and toward QSO sightlines drawn from the literature. Analysis of these data sets constraining the spatial coherence scale of circumgalactic MgII absorption is presented in a companion paper.2018ApJ...853...95Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/853/95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/261 : GOODS initial results (Giavalisco+, 2004)J/AJ/127/3121 : TKRS catalog of GOODS-North Field (Wirth+, 2004)J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008)J/ApJ/679/194 : Low-z intergalactic medium. III. (Danforth+, 2008)J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)J/ApJ/724/L176 : MgII absorbing gas around galaxies (Chen+, 2010)J/ApJ/779/87 : MAGIICAT. III. Virial masses (Churchill+, 2013)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/762/L19 : Quasar pairs spectroscopy (Prochaska+, 2013)J/ApJ/796/140 : Circumgalactic medium surrounding z~2 QSOs (Prochaska+, 2014)J/ApJ/794/156 : MgII/FeII absorption profile for 0.3<z<1.4 gal. (Rubin+, 2014)J/ApJ/815/91 : z<0.16 CIV absorbers from HST/COS QSOs sp. (Burchett+, 2015)J/MNRAS/452/2553 : Foreground-background quasar pairs (Johnson+, 2015)J/ApJ/812/147 : Slug analysis of star clusters (Krumholz+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/853/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/853/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/853/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/853/95https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/853/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/853/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/853/95/table1 (Galaxy pair targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/853/95/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/853/95/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/853/95/table1?GETtext/xml+votable180.050000true351.64054170.00113890.0055555555555555565/4422 6814 6/17682 17712-17713 17767 17773 18790-18791 18796 35931-35934 35956https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/853/95?format=asciidefaultJ/ApJ/853/95/table1Galaxy pair targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_PairNumber of pair for the background galaxymeta.numberintnullablePair[101/1613] Pair identification numbermeta.id;meta.mainintprimaryf_Pair[*] Flag on Pair (G1)meta.codecharRAJ2000Background galaxy hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Background galaxy degree of declination (J2000)pos.eq.dec;meta.mainRAFForeground galaxy hour of right ascension (J2000)pos.eq.raDEFForeground galaxy degree of declination (J2000)pos.eq.deczb/g1[0.3/3.1] Background galaxy redshift determined from low-dispersion PRIMUS prism spectroscopysrc.redshift;pos.heliocentricfloatSimbadNameSimbad column added by the CDSmeta.idcharnullablezf/g1[0.3/1.3] Foreground galaxy redshift determined from low-dispersion PRIMUS prism spectroscopysrc.redshift;pos.heliocentricfloatzb/g2[0.07/3.1]? Background galaxy redshift determined from our Keck/LRIS or VLT/FORS2 follow-up spectroscopysrc.redshift;pos.heliocentricdoublenullablef_zb/g2Flag on zb/g2 (1)meta.codecharzf/g2[0.2/1.3]? Foreground galaxy redshift determined from our Keck/LRIS or VLT/FORS2 follow-up spectroscopysrc.redshift;pos.heliocentricdoublenullablef_zf/g2Flag on zf/g2 (1)meta.codecharB(b/g)[19.8/22.8] Apparent B-band AB magnitude of the background objectmagphot.mag;em.opt.BfloatB(f/g)[21.1/23.6] Apparent B-band AB magnitude of the foreground objectmagphot.mag;em.opt.BfloatSep[1.4/25.2] Angular separationarcsecpos.angDistancefloatn_Pair[l] l=longslit observation; column added by CDSmeta.notecharf/gdisplay the foreground galaxy data (link to table 4)meta.ref.urlcharDR12Display the SDSS-DR12 data (V/147) within 2" for the background and foreground galaxiesmeta.ref.urlcharJ/ApJ/853/95/table4Foreground galaxy properties and circumgalactic medium (CGM) absorption line measurementsPair[101/1613] Pair identifiermeta.id;meta.mainintBMag[-22.6/-18.8]? Absolute B band magnitude (1)magphys.magAbsfloatnullableU-B[0.1/1.4]? The (U-B) color index (1)magphot.color;em.opt.U;em.opt.BfloatnullablelogM*[9/11.5] log stellar masslog(solMass)phys.massfloatSFR[0/19.2] Star Formation RatesolMass/yrphys.SFRfloatRperp[10.6/137] Projected separationkpcpos.distancefloatS/N-MgII[0.6/77] Median Signal-to-Noise within +/-500km/s of the MgII2796{AA} line0.1nm**-1stat.snrfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_Pair[*] Flag on Pair (G1)meta.codecharzf/g[0.2/1.3] Foreground galaxy spectroscopic redshiftsrc.redshift;pos.heliocentricfloatW2796[-1.8/2.6] Equivalent width of MgII2796{AA} line (2)0.1nmspect.line.eqWidthfloate_W2796[0.03/4.5] Uncertainty in W2796 (2)0.1nmstat.errorfloatf_W2796[b] Flag on W2796 (3)meta.codecharW2803[-1.4/2.6] Equivalent width of MgII2803{AA} line (2)0.1nmspect.line.eqWidthfloate_W2803[0.03/4.6] Uncertainty in W2803 (2)0.1nmstat.errorfloatf_W2803[b] Flag on W2803 (3)meta.codechardelv2796[-605/258] Velocity offset between flux-weighted centroid of 2796{AA} line and zf/gkm/sphys.veloc;arith.difffloat