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We report a definitive detection of chemically-enriched cool gas aroundmassive, quiescent galaxies at z~0.4-0.7. The result is based on a survey of37621 luminous red galaxy (LRG)-QSO pairs in SDSS DR12 with projected distanced<500 kpc. The LRGs are characterized by a predominantly old (age>~1Gyr)stellar population with 13% displaying [OII] emission features and LINER-likespectra. Both passive and [OII]-emitting LRGs share the same stellar massdistribution with a mean of <log(M*/Msun)>~11.4 and a dispersion of 0.2 dex.Both LRG populations exhibit associated strong MgII absorbers out to d<500 kpc.The mean gas covering fraction at d<~120 kpc is <kappa>_MgII > 15% and declinesquickly to <kappa>_MgII ~ 5% at d<~500 kpc. No clear dependence on stellar massis detected for the observed MgII absorption properties. The observed velocitydispersion of MgII absorbing gas relative to either passive or [OII]-emittingLRGs is merely 60% of what is expected from virial motion in these massivehalos. While no apparent azimuthal dependence is seen for <kappa>_MgII aroundpassive LRGs at all radii, a modest enhancement in <kappa>_MgII is detectedalong the major axis of [OII]-emitting LRGs at d<50 kpc. The suppressedvelocity dispersion of MgII absorbing gas around both passive and[OII]-emitting LRGs, together with an elevated <kappa>_MgII along the majoraxis of [OII]-emitting LRGs at d<50 kpc, provides important insights into theorigin of the observed chemically-enriched cool gas in LRG halos. We considerdifferent scenarios and conclude that the observed MgII absorbers around LRGsare best-explained by a combination of cool clouds formed in thermally unstableLRG halos and satellite accretion through filaments.

Characterizing the Chemically-Enriched Circumgalactic Medium of ~38000 Luminous Red Galaxies in SDSS DR12