Constraints on the Dark Matter Particle Mass from the Number of Milky Way Satellites

Details Constraints on the Dark Matter Particle Mass from the Number of Milky Way Satellites Constraints on the Dark Matter Particle Mass from the Number of Milky Way Satellites

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540802p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #408.02; Bulletin of the American Astronomical Society, Vol. 42, p.232

Astronomy and Astrophysics

Astronomy

Scientific paper

We have conducted N-body simulations of the growth of a Milky Way-sized halo in cold and warm dark matter cosmologies. Attention is given to the effects of discreteness in such simulations, namely the formation of nonphysical small mass halos along filaments. We compare the number of satellites in our simulated Milky Ways to the observed number of luminous satellites for the real Milky Way to derive constraints on the dark matter particle mass. We find a lower limit of 2 keV for a thermal dark matter particle and 11 keV for a sterile neutrino. The recent discovery of many new Milky Way satellites in the Sloane Digital Sky Survey allows us to find lower limits comparable to constraints from complementary methods such as modeling the Lyman-alpha forest flux power spectrum. Future surveys like LSST, DES, PanSTARRS, and SkyMapper have the potential to discover many more satellites and further improve constraints on the dark matter particle mass.

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