The distribution of dark matter in Draco and Ursa Minor

Details The distribution of dark matter in Draco and Ursa Minor The distribution of dark matter in Draco and Ursa Minor

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..701l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 15, 1990, p. 701-705.

Other

37

Dark Matter, Galactic Structure, Isothermal Processes, Mass Distribution, Star Distribution, Brightness Distribution, Dwarf Galaxies, Irregular Galaxies, Spiral Galaxies

Scientific paper

Draco and Ursa Minor both have published velocity dispersions of about 10 km/s implying large amounts of dark matter. Previous assumptions that the dark matter distribution followed the light led to central densities 2-3 orders of magnitude greater than in other dwarf galaxies. In this paper, models where the stellar distribution function is isothermal are constructed and star counts are used to constrain the mass distribution. Even with these different assumptions, the dark matter densities are high. Draco is poorly fitted with a uniform density halo, but good fits are obtained using a dark matter distribution with a core radius. In this model, the apparent cut-off radius has nothing to do with galactic tides.

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