Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3139t&link_type=abstract
Spitzer Proposal ID #3139
Physics
Scientific paper
ISO, COBE and SCUBA have shown convincingly that dusty star formation plays a key role in the early universe, although it is often assumed in primordial galaxy formation scenarios that dust is essentially absent. Such an assumption however has recently been challenged by the detection of dust emission in the second-most metal-poor star-forming galaxy known (2.5% solar), the blue compact dwarf (BCD) SBS 0335-052. Thus, to interpret the spectra of high-redshift galaxies, it is crucial to understand how and when this ubiquitous dust component is formed and how it affects the spectral energy distribution (SED) of galaxies by redistributing the UV-optical energy radiated by the young stars in the star-forming regions to MIR and FIR energy. Low-metallicity BCDs constitute the best local approximations to primordial galaxies because of their chemically unenriched interstellar medium. We propose to use IRAC, IRS and MIPS to study the SED from 5 to 160 microns of a sample of 23 metal-deficient BCDs chosen to span a wide metallicity range, from Z(Sun)/30 to Z(Sun)/4. These objects will be analyzed together with similar objects in the ROC, more than doubling our sample. We wish to study how the SEDs change as a function of various physical parameters such as metallicity, the hardness of the ionizing radiation, and the compactness of the starburst region. We will also be able to assess dust production mechanisms. Spitzer will provide an unique view of these nearby chemically unenriched star-forming laboratories, and an unprecedented opportunity to study in detail dust in very metal-deficient environments.
Hunt Leslie
Izotov Yuri
Plante Stephanie
Sauvage Marc
Thuan Trinh
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