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

S. C. Chapman | Zendy; Rodrigo Ibata | Zendy; Geraint F. Lewis | Zendy; A. M. N. Ferguson | Zendy; M. J. Irwin | Zendy; Alan W. McConnachie | Zendy; N. R. Tanvir | Zendy

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

Author(s) -

S. C. Chapman,

Rodrigo Ibata,

Geraint F. Lewis,

A. M. N. Ferguson,

M. J. Irwin,

Alan W. McConnachie,

N. R. Tanvir

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/497686

Subject(s) - physics , astrophysics , velocity dispersion , surface brightness , andromeda , dark matter , galaxy , dwarf spheroidal galaxy , luminosity , astronomy , stellar kinematics , galaxy formation and evolution , milky way , galaxy group

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.

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