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Galaxy nuclei are a unique laboratory to study gas flows. High-resolutionimaging of the gas flows in galactic nuclei are instrumental in the study ofthe fueling and the feedback of star formation and nuclear activity in nearbygalaxies. Several fueling mechanisms can be now confronted in detail withobservations done with state-of-the-art interferometers. Furthermore, the studyof gas flows in galactic nuclei can probe the feedback of activity on theinterstellar medium of galaxies. Feedback action from star formation and AGNactivity is invoked to prevent galaxies from becoming overly massive, but alsoto explain scaling laws like black hole (BH)-bulge mass correlations and thebimodal color distribution of galaxies. This close relationship betweengalaxies and their central supermassive BH can be described as co-evolution.There is mounting observational evidence for the existence of gas outflows indifferent populations of starbursts and active galaxies, a manifestation of thefeedback of activity. We summarize the main results recently obtained from theobservation of galactic inflows and outflows in a variety of active galaxieswith current millimeter interferometers like ALMA or the IRAM array.

Gas flows in galactic nuclei: observational constraints on BH-galaxy coevolution