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Halo Substructure and Disk Heating in a Lambda CDM Universe

Font, AS, Navarro, JF, Stadel, J and Quinn, T (2001) Halo Substructure and Disk Heating in a Lambda CDM Universe. The Astrophysical Journal Letters, 563 (1). ISSN 2041-8205

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Open Access URL: http://dx.doi.org/10.1086/338479 (Published version)

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 Gyrs. 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
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Related URLs:
Date Deposited: 14 Apr 2020 09:04
Last Modified: 14 Apr 2020 09:04
DOI or Identification number: 10.1086/338479
URI: http://researchonline.ljmu.ac.uk/id/eprint/12714

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