Dust in the Extremely Metal Poor Galaxy IZw18

Details Dust in the Extremely Metal Poor Galaxy IZw18 Dust in the Extremely Metal Poor Galaxy IZw18

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40132b&link_type=abstract

Spitzer Proposal ID #40132

Physics

Scientific paper

IZw18, with one of the lowest nebular metallicities measured to date (12+log(O/H)=7.2), is perhaps the most important link between primitive galaxies in the local universe and distant primeval sources. It is also the touchstone of any theory relating galaxy properties to metallicity. Existing archival MIPS observations were unsuccessful at detecting IZw18 at 160 um, but detected it at 70 um. We propose to obtain multiepoch deep MIPS observations at these wavelengths, designed to provide an order of magnitude better sensitivity than currently available. With a very modest investment of time, we will be able to measure the dust mass of this galaxy and determine its dust-to-gas ratio. If these observations resolve the extended atomic envelope of IZw18 we will be able to constrain the molecular gas content of this galaxy, and study the relationship between molecular gas and star formation at the lowest metallicities, providing valuable insights into star formation in the primitive universe.

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