Extragalactic H II Regions and the Interstellar Medium

Details Extragalactic H II Regions and the Interstellar Medium Extragalactic H II Regions and the Interstellar Medium

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5210t&link_type=abstract

HST Proposal ID #5210

Physics

Hst Proposal Id #5210 Interstellar Medium H Ii Regions

Scientific paper

Studies of extragalactic H~II regions are important for two reasons. First, access to an unbiased sample of H~II regions in a variety of environments is essential if we are to understand the range of observable properties these objects can have, and the physical processes underlying those properties. In addition, work on extragalactic H~II regions serves as a cornerstone to the study of the structure and evolution of galaxies. Diagnostic line ratios and fluxes are important for understanding star formation, and provide a unique look at the chemical composition, energetics, and structure of the star formation environment as a function of position within a galaxy. Ionizing radiation leaking from H~II regions is also the most plausible source of ionization for the ubiquitous warm diffuse phase of the ISM. In this program we will use the high spatial resolution of the HST to investigate the structure and stellar content of both inner and outer disk H~II regions in the giant spiral M~101.

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