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The mass of dwarf spheroidal galaxies and the missing satellite problem

Published online by Cambridge University Press:  08 November 2005

J. I. Read ,
M. I. Wilkinson ,
N. Wyn Evans ,
G. Gilmore  and
Jan T. Kleyna
J. I. Read
Affiliation:
Institute of Astronomy, Cambridge University
M. I. Wilkinson
Affiliation:
Institute of Astronomy, Cambridge University
N. Wyn Evans
Affiliation:
Institute of Astronomy, Cambridge University
G. Gilmore
Affiliation:
Institute of Astronomy, Cambridge University
Jan T. Kleyna
Affiliation:
Institute for Astronomy, University of Hawaii
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Abstract

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We present the results from a suite of N-body simulations of the tidal stripping of two-component dwarf galaxies comprising some stars and dark matter. We show that recent kinematic data from the local group dwarf spheroidal (dSph) galaxies suggests that dSph galaxies must be sufficiently massive ($10^9$–$10^{10}$M$_\odot$) that tidal stripping is of little importance for the stars. We discuss the implications of these massive dSph galaxies for cosmology and galaxy formation.

Keywords

dwarfdark matterLocal Groupkinematics and dynamicsinteractions