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We study the cool gas around a galaxy at z = 0.4729 using Keck/LRISspectroscopy of a bright (B = 21.7) background galaxy at z = 0.6942 at atransverse distance of 16.5/h_70 kpc. The background galaxy spectrum revealsstrong FeII, MgII, MgI, and CaII absorption at the redshift of the foregroundgalaxy, with a MgII 2796 rest equivalent width of 3.93 +/- 0.08 Angstroms,indicative of a velocity width exceeding 400 km/s. Because the backgroundgalaxy is large (> 4/h_70 kpc), the high covering fraction of the absorbing gassuggests that it arises in a spatially extended complex of cool clouds withlarge velocity dispersion. Spectroscopy of the massive (log M_*/M_sun = 11.15+/- 0.08) host galaxy reveals that it experienced a burst of star formationabout 1 Gyr ago and that it harbors a weak AGN. We discuss the possible originsof the cool gas in its halo, including multiphase cooling of hot halo gas, coldinflow, tidal interactions, and galactic winds. We conclude the absorbing gaswas most likely ejected or tidally stripped from the interstellar medium of thehost galaxy or its progenitors during the past starburst event. Adopting thelatter interpretation, these results place one of only a few constraints on theradial extent of cool gas driven or stripped from a galaxy in the distantUniverse. Future studies with integral field unit spectroscopy of spatiallyextended background galaxies will provide multiple sightlines throughforeground absorbers and permit analysis of the morphology and kinematics ofthe gas surrounding galaxies with a diverse set of properties and environments.

Galaxies probing galaxies: cool halo gas from a z = 0.47 post-starburst galaxy