Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9134g&link_type=abstract
HST Proposal ID #9134
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Hst Proposal Id #9134 Ism And Circumstellar Matter
Scientific paper
Giant H II regions in nearby galaxies are an intermediate link between energetic starbursts in distant galaxies and local star-forming complexes in the solar neighborhood. They provide an opportunity to study the connection between massive star formation regions, ionized supershells, and the diffuse ionized gas that pervades many star-forming galaxies. Although giant H II regions have been modeled extensively, key questions remain unresolved: {1} what is the connection between the giant H II region and the diffuse ionized gas? {2} how do Wolf-Rayet stars influence the observed spectrum of the H II region? {3} is there significant leakage of ionizing radiation from giant H II regions into the ISM? {4} are the observed emission line ratios and ionization structure consistent with predictions based on stellar photon fluxes? One important key to answering these questions is high resolution imaging of giant H II regions and the surrounding regions. Here I propose an imaging study of one of the nearest giant H II regions, NGC 604 in the spiral galaxy M33 with the WFPC-2. This object has extensive archival WFPC-2 imaging in broad-band filters and some emission lines. I will obtain new imaging in other important diagnostic lines {e.g. O II, S III, and HBeta} to provide a more accurate picture of the ionization structure, and compare the emission-line imaging with the known stellar populations and ionization modeling.
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