Black hole models for the dark matter in Draco and Ursa Minor

Details Black hole models for the dark matter in Draco and Ursa Minor Black hole models for the dark matter in Draco and Ursa Minor

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424l..83s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 2, p. L83-L86

Astronomy and Astrophysics

Astronomy

8

Black Holes (Astronomy), Cusps (Mathematics), Dark Matter, Halos, Milky Way Galaxy, Nomographs, Velocity, Ellipticity, Globular Clusters, Space Density

Scientific paper

The stellar velocity dispersions of Draco and Ursa Minor have been used to infer large dark matter halos with central mass densities that are two orders of magnitude larger than found in brighter galaxies. We offer a different dark matter model. We fit the star count profiles using massive central black holes (1-2 x 107 solar mass) and investigate the agreement between this model and the latest velocity data. Such black holes produce the large observed velocity dispersions and create a density and distinctive velocity cusp close to the center. Star counts reaching the main sequence will lead to more accurate centering of the isopleths and may reveal a more prominent cusp.

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