Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential

Details Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential

2010-11-29

arxiv.org/abs/1011.6374v1

Phys.Rev.Lett.106:171302,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.106.171302

We show that cold dark matter particles interacting through a Yukawa potential could naturally explain the recently observed cores in dwarf galaxies without affecting the dynamics of objects with a much larger velocity dispersion, such as clusters of galaxies. The velocity dependence of the associated cross-section as well as the possible exothermic nature of the interaction alleviates earlier concerns about strongly interacting dark matter. Dark matter evaporation in low-mass objects might explain the observed deficit of satellite galaxies in the Milky Way halo and have important implications for the first galaxies and reionization.

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