Distribution Of Dark Matter In The Smallest Galaxies

Details Distribution Of Dark Matter In The Smallest Galaxies Distribution Of Dark Matter In The Smallest Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2601w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #26.01; Bulletin of the American Astronomical Society, Vol. 39, p.776

Astronomy and Astrophysics

Astronomy

Scientific paper

The kinematics of stars within nearby dwarf spheroidal (dSph) galaxies imply that these systems are embedded within dominant dark matter halos having mass-to-light ratios as large as several hundred solar units. As the smallest observed dark matter structures in a Lambda-CDM Universe, dSphs offer a valuable window on early epochs of structure formation, and the mass distribution in these systems must contain fundamental information regarding the nature of dark matter.
We present large samples of dSph velocities obtained using multi-object fiber systems at the Magellan and MMT telescopes. We have measured precise (+/- 2 km/s) line-of-sight velocities for nearly 5000 member stars in seven dSph satellites of the Milky Way. We discuss various mass models and their limiting assumptions. Regardless of the adopted model we find strikingly similar masses enclosed within the region common to each sample.

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