IRS Spectra of M101 HII Regions in the Aromatic Feature Transition Region

Details IRS Spectra of M101 HII Regions in the Aromatic Feature Transition Region IRS Spectra of M101 HII Regions in the Aromatic Feature Transition Region

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30244r&link_type=abstract

Spitzer Proposal ID #30244

Physics

Scientific paper

We are proposing to obtain IRS spectroscopy of 6 HII regions in M101 in the metallitcity range [12+log(0/H)] from 7.9 to 8.4. Previous IRS spectroscopy of M101 HII regions and starburst galaxies has shown that this metallitcity range is crucial in understanding the physics of changes in the ratio of the feature strengths seen in the ubiquitous Aromatic Emission Features (AFEs, also commonly called the PAH features). Due to its large size and strong metallicity gradient, the HII regions in M101 provide a unique opportunity to study the properties of massive star formation as a function of metallicity and radiation field hardness. The observations proposed here will allow for new, sensitive probes of the AEFs in this crucial metallicity range and put constraints on the carrier of these features, improving our ability to predict the IR SEDs of star forming regions.

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