Are the Ultra-Faint Milky Way Dwarf Galaxies the Solution to the Missing Satellite Problem?

Details Are the Ultra-Faint Milky Way Dwarf Galaxies the Solution to the Missing Satellite Problem? Are the Ultra-Faint Milky Way Dwarf Galaxies the Solution to the Missing Satellite Problem?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2602s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #26.02; Bulletin of the American Astronomical Society, Vol. 39, p.777

Astronomy and Astrophysics

Astronomy

Scientific paper

The recently discovered ultra-faint satellites of the Milky Way have luminosities similar to the faintest globular clusters, but kinematics and metallicities that clearly indicate that they are dwarf galaxies. We present Keck/DEIMOS spectroscopy of stars in eight of these tiny systems, which we use to measure their velocity dispersions and masses. We find that they are both the least massive and the most dark matter-dominated galaxies currently known. Using these new measurements, we re-examine the ΛCDM missing satellite problem and conclude that the ultra-faint dwarfs can solve the discrepancy.

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