Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9115k&link_type=abstract
HST Proposal ID #9115
Other
Hst Proposal Id #9115 Stellar Populations
Scientific paper
We propose to observe a recently discovered sample of the closest known low surface brightness {LSB}, very gas-rich dwarf galaxies outside of the Local Group. These galaxies represent an extreme star formation environment, where the fuel for star formation appears plentiful, the local environment {the Centaurus A group of galaxies} provides opportunities for tidally-induced star formation, and yet star formation appears to be surpressed {by two orders of magnitude} compared to other `typical' galaxies. Our goal is to understand the star formation history in this puzzling environment of low stellar density and high gas content. By resolving the underlying stellar component with WFPC2, we will obtain critical information on the mean metallicity and star formation history of these galaxies. The HST data will be combined with a vigorous ground-based program to study the ongoing massive star formation rate and the mean age of the stellar population, through a combination of broadband {UBVRI} and narrowband {H-alpha and [S II]} imaging. The combined data sets will help us understand the star formation process in these extreme gas-rich LSB galaxies, and in gaseous galaxies in general. Such knowledge is key for our comprehension of the present day role of the most common type of potentially star forming galaxies in the Universe, and may aid us in interpreting results at high redshifts on star formation in the early universe.
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