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A. Koch (Astronomical Insititute of the University of Basel, Switzerland), M.I. Wilkinson (Institute of Astronomy, Cambridge, UK), J.T. Kleyna (Institute for Astronomy, Hawaii, USA), G.F. Gilmore, N.W. Evans (Institute of Astronomy, Cambridge, UK), E.K. Grebel (Astronomical Institute of the University of Basel, Switzerland)
We present radial velocity measurements of red giants in the Galactic dwarf spheroidal (dSph) galaxy Leo I based on data taken with Gemini's Multiobject Spectrograph GMOS. These data, reaching out to the galaxy's nominal tidal radius, permit us to trace its velocity dispersion profile across the whole area of Leo I. By means of detailed dynamical modelling we discuss the implications on this dSph's dark matter halo and mass profile.
AK acknowledges support from the European Commission under the Marie Curie Early Stage Research Training programme.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.