Probing the Least Luminous Galaxies in the Local Universe

Details Probing the Least Luminous Galaxies in the Local Universe Probing the Least Luminous Galaxies in the Local Universe

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11084z&link_type=abstract

HST Proposal ID #11084. Cycle 15

Physics

Scientific paper

We propose to obtain deep color-magnitude data of eight new Local Group galaxies which we recently discovered: Andromeda XI, Andromeda XII, and Andromeda XIII satellites of M31; Canes Venatici I, Canes Venatici II, Hercules, and Leo IV satellites of the Milky Way; and Leo T, a new "free-floating" Local Group dwarf spheroidal with evidence for recent star formation and associated H I gas. These represent the least luminous galaxies known at *any* redshift, and are the only accessible laboratories for studying this extreme regime of galaxy formation. With deep WFPC-2 F606W and F814W pointings at their centers, we will determine whether these objects contain single or multiple age stellar populations, as well as whether these objects display a range of metallicities.

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