Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20425s&link_type=abstract
Spitzer Proposal ID #20425
Physics
Scientific paper
Characterizing the ISM and the star formation process at low metallicity is vital to our understanding of galaxy formation and evolution. Nearby dwarf galaxies represent our best opportunity to obtain observational constraints on our theoretical models of the low metallicity environment. Prior to Spitzer, even the closest dwarf galaxies were practically invisible at mid- and far- infrared wavelengths due to their intrinsically low surface brightnesses. However, the unprecedented sensitivity of MIPS on Spitzer allows us to make high resolution observations of the nearest low metallicity dwarf star forming galaxies for the first time. We will map the dust distributions, fluxes, and temperatures in these galaxies and, in combination with a nearly ideal set of ancillary observations, study the dependence of the physical properties of the ISM as a function of metallicity. We will also determine the metallicity dependence of three independent measurements of the star formation rate. The proposed modest number of requested observing hours will allow important strides forward in our understanding of the nature of the ISM and star formation at very low metallicities.
Cannon John
Gehrz Robert
Jackson Dale
Lee Henry
Polomski Elisha
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