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We present the results of a kinematic survey of the dwarf spheroidalsatellite of M31, And-IX, which appears to be the lowest surface brightness andalso the faintest galaxy (M_V = -8.3) found to date. Using Keck/DEIMOSspectroscopic data, we have measured its velocity relative to M31, its velocitydispersion, and its metallicity. It exhibits a significant velocity dispersionsigma_v = 6.8+3.0-2.0km/s, which coupled with the low luminosity implies a veryhigh mass to V-band light ratio, M/L ~ 93+120-50msun/lsun (M/L > 17msun/lsun at99% confidence). Unless strong tidal forces have perturbed this system, thissmallest of galaxies is a highly dark matter dominated system.

A Keck DEIMOS Kinematic Study of Andromeda IX: Dark Matter on the Smallest Galactic Scales