Kinematics of Halo Gas in Milky Way Analogs

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We will discuss the kinematics of halo gas in Milky Way analogs at redshift 0.2 based on new Keck LRIS spectroscopy of background quasars. The Doppler shifts of the low-ionization-state gas are smaller than expected for gas in virial equilibrium. The line profiles of the MgII absorption show asymmetric shapes, and the Doppler shifts of the line wings have the same sign of rotation as each star-forming disk. The total velocity width spanned by each absorption line is a challenge to explain with simple models. The observed line width can typically explain by adding a radial inflow component in the disk plane to a rotating disk model.

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