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The presence of a circumnuclear stellar disk around Sgr A* and megamasersystems near other black holes indicates that dense neutral disks can be foundin galactic nuclei. We show that depending on their inclination angle, opticaldepth, and spin temperature, these disks could be observed spectroscopicallythrough 21 cm absorption. Related spectroscopic observations of Sgr A* candetermine its HI disk parameters and the possible presence of gaps in the disk.Clumps of dense gas similar to the G2 could could also be detected in 21 cmabsorption against Sgr A* radio emission.

Mapping the Dynamics of Cold Gas around Sgr A* through 21 cm Absorption