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Halo substructure and disk heating in a Lambda cold dark matter universe.

Font, A. S. and Navarro, J. F. and Stadel, J. and Quinn, T. (2001) 'Halo substructure and disk heating in a Lambda cold dark matter universe.', Astrophysical journal : letters., 563 (1). L1-L4.


We examine recent suggestions that substructure in cold dark matter (CDM) halos may be in conflict with the presence of thin, dynamically fragile stellar disks. N-body simulations of an isolated disk/bulge/halo model of the Milky Way that includes several hundred dark matter satellites with masses, densities, and orbits derived from high-resolution cosmological CDM simulations indicate that substructure at z = 0 plays only a minor dynamical role in the heating of the disk over several gigayears. This is because the orbits of satellites in present-day CDM halos seldom take them near the disk, where their tidal effects are greatest. Unless the effects of substructure are very different at earlier times, our models suggest that substructure might not preclude virialized CDM halos from being acceptable hosts of thin stellar disks like that of the Milky Way.

Item Type:Article
Keywords:Dark matter galaxies, Evolution galaxies, Structure methods, N-body simulations.
Full text:Full text not available from this repository.
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Record Created:12 May 2008
Last Modified:15 Mar 2011 12:39

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