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A.J. Barth (Harvard-Smithsonian CfA), H.-W. Rix (MPIA Heidelberg), L.C. Ho (OCIW), A.V. Filippenko (U. C. Berkeley), W.L.W. Sargent (Caltech)
NGC 3245 is an S0 galaxy with a well-defined nuclear disk of dust and ionized gas. As part of a program to measure black hole masses in low-luminosity AGNs, we have obtained \emph{HST}/STIS spectra of the nuclear disk at five parallel slit positions using the 0\farcs2-wide slit. The velocity field measured from the H\alpha and [\ion{N}{2}] \lambda6584 emission lines shows orderly rotation in the disk and a steep velocity gradient across the nucleus. We present the results of modeling the velocity field of the ionized gas and our measurement of the central mass.