The dark matter halos of Draco and Ursa Minor

Details The dark matter halos of Draco and Ursa Minor The dark matter halos of Draco and Ursa Minor

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..127p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, July 1990, p. 127-140. Research supported by Rutgers University.

Astronomy and Astrophysics

Astronomy

83

Astronomical Models, Dark Matter, Dwarf Galaxies, Halos, Anisotropy, Radial Velocity, Space Density, Velocity Distribution

Scientific paper

Published density profiles and central velocity dispersions place important constraints on the stellar velocity ellipsoid and on the distribution of dark matter (DM) in the dwarf spheroidal galaxies Draco and Ursa Minor. Central velocity dispersions of 9 km/s are adopted for Draco and 11 km/s for Ursa Minor. Then, for an isotropic stellar velocity distribution, the central DM densities are 0.8 and 1.0 solar mass/cu pc, respectively, if visible and dark matter have the same core radius. If DM has a much larger core radius than visible matter but nevertheless dominates the potential, these densities are reduced by a factor of 2. Central DM densities can be lower than this only if the stellar velocity distribution is anisotropic. Simple two-component King models are used to investigate this and to look for the smallest DM densities that are consistent with the observations.

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