A Complete Picture of the Dust in the Small Magellanic Cloud: Following up Spitzer Imaging with Spectroscopic Observations

Details A Complete Picture of the Dust in the Small Magellanic Cloud: Following up Spitzer Imaging with Spectroscopic Observations A Complete Picture of the Dust in the Small Magellanic Cloud: Following up Spitzer Imaging with Spectroscopic Observations

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30491b&link_type=abstract

Spitzer Proposal ID #30491

Astronomy and Astrophysics

Astrophysics

Scientific paper

We request Spitzer Space Telescope time to obtain wide-field spectroscopic maps of several regions in the Small Magellanic Cloud. This survey is complementary to the imaging information obtained by the Spitzer survey of the SMC (S3MC), and it is designed to sample a variety of environments. We will use these data to unravel the life-cycle, distribution, abundance, and composition of PAHs and dust throughout the SMC, linking spectral variations to the measured IRAC/MIPS SEDs. IRS spectroscopy will allow us to relate variations in PAH and dust chemistry and excitation (such as size, structure, hydrogenation, and ionization state) to the physical conditions and astrophysical processes present in the mapped regions. This study will provide strong constraints on theoretical dust models, in addition to producing information on the abundance, life cycle, and evolution of PAHs and VSGs. Ultimately, this research will help constrain the properties of the ISM in primordial galaxies at high redshifts.This project takes advantage of the uniquely new ability of Spitzer, which is capable of obtaining sensitive spectral maps covering large areas with a modest investment of time.

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