Computer Science
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20068s&link_type=abstract
Spitzer Proposal ID #20068
Computer Science
Scientific paper
We propose to obtain IRAC images of reflection nebulae (RN) illuminated by cool stars (Teff = 3,000 - 9,400 K). Our IRAC measurements of six RN will complement existing IRAC images of RN illuminated by B stars (Teff=11,000-22,000 K). In our previous IRAS study of RN illuminated by stars with Teff = 3,000 - 22,000 K, we contrasted the IRAS colors of RN illuminated by B stars and cool stars. Our results led to major advances in our understanding of the ISM, inspiring laboratory and theoretical work on PAH ionization and on the size distribution of PAH molecules and aromatic grains. Current ISM models, fit to our IRAS observations of RN, still find some RN illuminated by cool stars to disagree with model predictions. These discrepant RN form the heart of this proposal. Spitzer offers us vast improvements in sensitivity and angular resolution. Our entire IRAS sample of RN illuminated by B stars has been already imaged with IRAC. We now propose to obtain IRAC colors for RN illuminated by cool stars, to contrast with RN illuminated by B stars. We expect our Spitzer results to challenge current ISM models and to influence the development of new ISM models in the same way our IRAS results did.
Sellgren Kris
Uchida Keven
Werner Mike
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