The Masses of the Least Luminous Galaxies

Details The Masses of the Least Luminous Galaxies The Masses of the Least Luminous Galaxies

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431107s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #311.07; Bulletin of the American Astronomical Society, Vol. 41, p.747

Astronomy and Astrophysics

Astronomy

Scientific paper

The faintest dwarf galaxies around the Milky Way are extremely valuable laboratories for studying the threshold for galaxy formation, chemical evolution in the early universe, and the nature of dark matter. Because existing surveys can only detect such systems out to distances of 50 kpc and have not yet covered most of the sky, the number of galaxies with M_V > -5 remains small and their properties are poorly known. We present new spectroscopic observations of larger samples of stars in several of these ultra-faint dwarf galaxies and use these data sets to derive improved masses and to investigate the influence that tides and binary stars may have on our kinematic measurements.

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