Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20012w&link_type=abstract
Spitzer Proposal ID #20012
Astronomy and Astrophysics
Astrophysics
Scientific paper
We use the giant H II region RCW49 as an astrophysical laboratory to improve our understanding of PAH emission and PAH emission models. If the broad emission features seen in the near and mid infrared are due to PAHs, then specific band ratios and band widths are predicted to change with local conditions. We use the high spatial resolution of Spitzer along with high sensitivity to create a series of IRS maps to test these models. In addition, we examine the variation in the PAH/continuum ratio to probe the small grain abundances. Since the entire region has been mapped by IRAC we will also directly measure the contribution by PAH and continuum emission to the IRAC [5.8] and IRAC [8.0] bands and we will predict the line emission in all IRAC bands from the longer wavelength line emission measured by the Spitzer IRS high resolution mode.
Indebetouw Remy
Mathis John
Whitney Barbara
Wolfire Mark
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