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

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dc.contributor.authorChapman, Scott C.en_US
dc.contributor.authorIbata, Rodrigoen_US
dc.contributor.authorLewis, Geraint F.en_US
dc.contributor.authorFerguson, Annette M. N.en_US
dc.contributor.authorIrwin, Mikeen_US
dc.contributor.authorMcConnachie, Alanen_US
dc.contributor.authorTanvir, Nialen_US
dc.date.accessioned2014-03-12T19:21:08Z
dc.date.available2014-03-12T19:21:08Z
dc.date.issued2005-10-20en_US
dc.description.abstractWe 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.en_US
dc.identifier.citationChapman, Scott C., Rodrigo Ibata, Geraint F. Lewis, Annette M. N. Ferguson, et al. 2005. "A Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scales." The Astrophysical Journal 632(2): 87-L90en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.issue2en_US
dc.identifier.startpage87en_US
dc.identifier.urihttp://dx.doi.org/10.1086/497686en_US
dc.identifier.urihttp://hdl.handle.net/10222/45540
dc.identifier.volume632en_US
dc.titleA Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scalesen_US
dc.title.alternativeThe Astrophysical Journalen_US
dc.typearticleen_US

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