Dark Mater and Dwarf Galaxies in the Era of SIM Planetquest

Details Dark Mater and Dwarf Galaxies in the Era of SIM Planetquest Dark Mater and Dwarf Galaxies in the Era of SIM Planetquest

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345514s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #455.14; Bulletin of the American Astronomical Society, Vol. 41, p.356

Astronomy and Astrophysics

Astronomy

Scientific paper

The era of high precision astrometry will allow for a study of internal proper motions of stars in the dark matter dominated Milky Way satellite galaxies. Internal proper motions of stars in these galaxies are beneficial because they will break the degeneracy between the slope of the dark matter halo profile and the velocity anisotropy, and thus reveal whether there is a dark matter core or cusp in these halos. These astrometric measurements will directly constrain the phase space density of these dark matter halos and thus strongly constrain the nature of the dark matter particle. I will discuss this idea in the context of the SIM PlanetQuest Mission, which will have the sensitivity to obtain hundreds of internal proper motions in several dSphs.

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