Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12180c&link_type=abstract
HST Proposal ID #12180. Cycle 18
Computer Science
Scientific paper
Low-mass galaxy evolution is driven by both internal {e.g., star formation and feedback} and external {e.g., tidal interaction} processes; however, few nearby systems show evidence of both mechanisms operating in tandem. The Local Group dwarf galaxy NGC 6822 presents a unique opportunity to study important evolutionary processes because of proximity and timing: it harbors one of the largest known holes in its neutral ISM {a signpost of violent stellar feedback}, and it appears to be undergoing a tidal interaction with a very low mass companion dwarf galaxy. To capitalize on this opportunity, we propose to undertake an ACS and WFC3 imaging study of the stellar populations throughout NGC 6822. We will study the role of both internal and external processes by sampling the stellar populations associated with the main body {using archival WFPC2 data}, the giant HI hole, the companion dwarf galaxy, and the tidal material at the ends of the disk. From these data we will extract precise color magnitude diagrams; we will measure the full 13 Gyr star formation history of each field, with high time resolution {20-250 Myr} over the past 1 Gyr, and quantify the relative contributions of internal and external drivers of dwarf galaxy evolution. Specifically, we will study: 1} the nature of the companion object {differentiating between infalling gas and a genuine low-mass galaxy}; 2} the energetics of giant HI hole creation; 3} the role of interactions in the system's evolution; 4} the nature of feedback in governing the star formation process; and 5} the patterns of star formation over time. We have optimized our field placements to extract the most information possible about the competing forces that drive galaxy evolution; in only six orbits, we will gain fundamental insights into the contributions of both internal and external processes that bear on the evolution of low-mass galaxies.;
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