Other
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.2310h&link_type=abstract
Spitzer Proposal ID #2310
Other
Scientific paper
Molecular gas is an important component of the interstellar medium of galaxies and plays a crucial role in star formation. Dwarf irregular (dIm) galaxies often have intense stellar radiation fields due to the young, massive star populations, low dust-to-gas ratios, and long path-lengths for photons. Therefore, significant portions of the molecular gas in these galaxies could be warm. We propose to explore this component of the ISM of a sample of dIm galaxies through direct observations of H_2 in the S(0) and S(1) rotation lines. We are targeting four representative HI/CO complexes in four representative dIm galaxies that have been the target of our studies of the cold molecular content. The four galaxies cover a range in galactic properties, including HI distribution, metallicity, and total mass, and the four HI/CO complexes within these galaxies cover a range in properties of HI complexes, particulary relationship to Halpha and embedded star formation. Thus, we can determine the molecular content of HI/CO complexes under a variety of galactic and local environments in Im galaxies. We will use this to estimate the molecular content of other galaxies in our large star-forming survey from HI and infrared maps.
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