Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10838z&link_type=abstract
HST Proposal ID #10838. Cycle 15
Physics
Scientific paper
We propose to obtain deep color-magnitude data of the M31 satellites Andromeda IX and Andromeda X, which we recently discovered Zucker et al. 2004, 2006 and which are possibly the least luminous galaxies known Mv ~ -8. These objects are laboratories to study this extreme regime of galaxy formation and understand whether there is a clear lower limit to the galaxy mass function. Specifically, we want to check, from deep ACS pointings F606W, F814W at their centers, whether these objects contain single or multiple age stellar populations, possibly with a metallicty spread. To bypass the age-metallicity degeneracy we require accurate photometry for the main sequence turnoff and giant branch stars. We also wish to map the overall structure of these objects via 3 x 3 mosaics of ACS single-orbit pointings also F606W and F814W. From this, we can determine if they are round and relaxed, or display signs of tidal distortion. In addition, the mosaic will enable us to measure stellar population substructure, such as a metallicity gradient with radius.
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