A Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scales

Alan McConnachie; Annette M. N. Ferguson; Geraint F. Lewis; Mike Irwin; Nial Tanvir; Rodrigo Ibata; Scott C. Chapman

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A Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scales

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arxiv astro-ph/0506103 v1 pith:JGRHRYPB submitted 2005-06-06 astro-ph

Scott C. Chapman , Rodrigo Ibata , Geraint F. Lewis , Annette M. N. Ferguson , Mike Irwin , Alan McConnachie , Nial Tanvir This is my paper

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We present the results of a kinematic survey of the dwarf spheroidal satellite of M31, And-IX, which appears to be the lowest surface brightness and also the faintest galaxy (M_V = -8.3) found to date. Using Keck/DEIMOS spectroscopic data, we have measured its velocity relative to M31, its velocity dispersion, and its metallicity. It exhibits a significant velocity dispersion sigma_v = 6.8+3.0-2.0km/s, which coupled with the low luminosity implies a very high mass to V-band light ratio, M/L ~ 93+120-50msun/lsun (M/L > 17msun/lsun at 99% confidence). Unless strong tidal forces have perturbed this system, this smallest of galaxies is a highly dark matter dominated system.

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