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Fermion Dark Matter at the Center and in the Halo of the Galaxy

After a discussion of the properties of degenerate fermion balls, we analyze the orbits of the star S0-2, in the supermassive black hole as well as in the fermion ball scenarios of the Galactic center. It is shown that both scenarios are consistent with the data of S0-2, which since 1992 has had a projected distance to Sgr A* smaller than 10 light-days, as measured during eight years by Eckart et al. and Ghez et al. We then consider a self-gravitating ideal fermion gas at nonzero temperature as a model for the Galactic halo. The Galactic halo of mass ~ 10^{12} solar masses, enclosed within a radius of ~ 200 kpc, is consistent with the existence of a supermassive compact dark object at the Galactic center that is in hydrostatic and quasi-thermal equilibrium with the halo.

dark matter; selfgravitating gas; Galactic center; Galactic halo

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