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

Font, A.S.; Navarro, J.F.; Stadel, J.; Quinn, T.

Authors

A.S. Font

J.F. Navarro

J. Stadel

T. Quinn



Abstract

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.

Citation

Font, A., Navarro, J., Stadel, J., & Quinn, T. (2001). Halo substructure and disk heating in a Lambda cold dark matter universe. Astrophysical Journal Letters, 563(1), L1-L4. https://doi.org/10.1086/338479

Journal Article Type Article
Publication Date Dec 1, 2001
Deposit Date May 12, 2008
Journal Astrophysical Journal Letters
Print ISSN 2041-8205
Electronic ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 563
Issue 1
Pages L1-L4
DOI https://doi.org/10.1086/338479
Keywords Dark matter galaxies, Evolution galaxies, Structure methods, N-body simulations.
Publisher URL http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v563n1/15450/brief/15450.abstract.html

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