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We present results on gas flows in the halo of a Milky Way-like galaxy atz=0.413 based on high-resolution spectroscopy of a background galaxy. This isthe first study of circumgalactic gas at high spectral resolution towards anextended background source (i.e., a galaxy rather than a quasar). Usinglongslit spectroscopy of the foreground galaxy, we observe spatially extended Halpha emission with circular rotation velocity v=270 km/s. Using echellespectroscopy of the background galaxy, we detect Mg II and Fe II absorptionlines at impact parameter rho=27 kpc that are blueshifted from systemic in thesense of the foreground galaxy's rotation. The strongest absorber EW(2796) =0.90 A has an estimated column density (N_H>10^19 cm-2) and line-of-sightvelocity dispersion (sigma=17 km/s) that are consistent with the observedproperties of extended H I disks in the local universe. Our analysis of therotation curve also suggests that this r=30 kpc gaseous disk is warped withrespect to the stellar disk. In addition, we detect two weak Mg II absorbers inthe halo with small velocity dispersions (sigma<10 km/s). While the exactgeometry is unclear, one component is consistent with an extraplanar gas cloudnear the disk-halo interface that is co-rotating with the disk, and the otheris consistent with a tidal feature similar to the Magellanic Stream. We canplace lower limits on the cloud sizes (l>0.4 kpc) for these absorbers given theextended nature of the background source. We discuss the implications of theseresults for models of the geometry and kinematics of gas in the circumgalacticmedium.

Galaxies Probing Galaxies at High Resolution: Co-Rotating Gas Associated with a Milky Way Analog at z=0.4