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The gas added and removed from galaxies over cosmic time greatly affectstheir stellar populations and star formation rates. QSO absorption studies inclose QSO/galaxy pairs create a unique opportunity to study the physicalconditions and kinematics of this gas. Here we present new Hubble SpaceTelescope (HST) images of the QSO/galaxy pair 3C 232/NGC 3067. The quasarspectrum contains a Lyman-limit absorption system (LLS) due to NGC 3067 at cz =1421 km/s that is associated with the nearby SAB galaxy NGC 3067. Previous workidentifies this absorber as a high-velocity cloud (HVC) in NGC 3067 but thekinematics of the absorbing gas, infalling or outflowing, were uncertain. TheHST images presented here establish the orientation of NGC 3067 and soestablish that the LLS/HVC is infalling. Using this system as a prototype, weextend these results to higher-z Mg II/LLS to suggest that Mg II/LLSs are asight line sampling of the so-called "cold mode accretion" (CMA) infalling ontoluminous galaxies. But to match the observed Mg II absorber statistics, the CMAmust be more highly ionized at higher redshifts. The key observations needed tofurther the study of low-z LLSs is HST/UV spectroscopy, for which a newinstrument, the Cosmic Origins Spectrograph, has just been installed greatlyenhancing our observational capabilities.

A Direct Detection of Gas Accretion: The Lyman Limit System in 3C 232