Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10472m&link_type=abstract
HST Proposal ID #10472
Physics
Hst Proposal Id #10472 Stellar Populations
Scientific paper
A long-standing question in the field of galaxy evolution is whether metal-poor star-forming galaxies {like I ZW 18} posses a very old {>10 Gyr} stellar population. An excellent example of such a primordial galaxy is the Sagittarius dwarf irregular {SagDIG}. Besides being very metal-poor, this object is exceptionally rich in atomic gas and shows evidence of propagating star formation. Such features make of SagDIG and ideal target for the study of star formation and its triggering mechanism in extremely metal-poor environments. The deep, wide-field imaging capability of ACS is able to detect an unprecedented number of the oldest stellar population. Such data will enable the construction of both the star formation and chemical enrichment history. In particular, determining the epoch of formation of the first stars in such objects places a constraint on heirarchical galaxy formation in "bottom up" cosmologies.
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