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2006MNRAS.367..387R - Mon. Not. R. Astron. Soc., 367, 387-399 (2006/March-3)
The importance of tides for the Local Group dwarf spheroidals.
READ J.I., WILKINSON M.I., EVANS N.W., GILMORE G. and KLEYNA J.T.
Abstract (from CDS):
These results have important implications for the formation of the dSphs and for cosmology. As a result of the existence of cold stars at large radii in several dSphs, a tidal origin for the formation of these Local Group dSphs (in which they contain no dark matter) is strongly disfavoured. In the cosmological context, a naive solution to the missing satellites problem is to allow only the most massive substructure dark matter haloes around the Milky Way to form stars. It is possible for dSphs to reside within these haloes (∼1010M☉) and have their velocity dispersions lowered through the action of tidal shocks, but only if they have a central density core in their dark matter, rather than a cusp. A central density cusp persists even after unrealistically extreme tidal shocking and leads to central velocity dispersions which are too high to be consistent with data from the Local Group dSphs. dSphs can reside within cuspy dark matter haloes if their haloes are less massive (∼109M☉) and therefore have smaller central velocity dispersions initially.
Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS
Journal keyword(s): galaxies: dwarf - galaxies: kinematics and dynamics - Local Group
Simbad objects: 6
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