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

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

2003-10-10

arxiv.org/abs/astro-ph/0310294v1

Astronomy and Astrophysics

Astrophysics

6 pages, to appear in the Beyond 2003 conference proceedings

Scientific paper

All presently known stellar-dynamical constraints on the size and mass of the supermassive compact dark object at the Galactic center are consistent with a ball of self-gravitating, nearly non-interacting, degenerate fermions with mass between 76 and 491 keV, for degeneracy factor g=2. Sterile neutrinos of 76 keV mass, which are mixed with at least one of the active neutrinos with a mixing angele ~10^{-7}, are produced in about the right amount in the early Universe by incoherent resonant and non-resonant scattering of active neutrinos having asymmetry of ~0.01. The former process yields sterile neutrinos with a quasi-degenerate spectrum while the latter leads to a thermal spectrum. As the production mechanism of the sterile neutrino is consistent with the constraints from large scale structure formation, core collapse supernovae, and diffuse X-ray background, it could be the dark matter particle of the Universe.

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