Abstract
High angular resolution decimetric observations of neutral gas in active galactic nuclei and starburst galaxies are reviewed. The neutral gas is mostly observed via atomic hydrogen absorption, or via maser emission from the hydroxyl radical (OH). The role of these observations in investigating the properties of neutral gas associated with the proposed dusty torus in AGN is discussed, together with the dynamical constraints to the mass of possible black holes in starburst galaxies.
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