Examining the Nature of Dark Matter in Dwarf Galaxies with SIM PlanetQuest

Details Examining the Nature of Dark Matter in Dwarf Galaxies with SIM PlanetQuest Examining the Nature of Dark Matter in Dwarf Galaxies with SIM PlanetQuest

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20711304g&link_type=abstract

American Astronomical Society Meeting 207, #113.04; Bulletin of the American Astronomical Society, Vol. 37, p.1345

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Scientific paper

We describe a proposed SIM PlanetQuest project to examine the nature of the dark matter which dominates several dwarf spherioidal galaxies in the Local Group. By measuring a total of five phase space coordinates for 100 stars per galaxy we can unambiguously isolate the effects of triaxiality and orbital anisotropy in these relatively simple systems and thereby characterize the underlying distribution (and thus temperature) of the dark matter. The project relies on the measurement of highly accurate proper motions (2-5 microarcseconds per year) for relatively faint stars ( V 19), a requirement which is uniquely satisfied by SIM PlanetQuest and which cannot be met by any other mission currently on the horizon.

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