Spitzer Space Telescope - Archive Research Proposal #30696


A Comparison of the Infrared and Ultraviolet Properties of
Photodissociation Regions

Principal Investigator: Stephan  McCandliss
           Institution: Johns Hopkins University

Co-Investigators: 
Kevin France, Johns Hopkins University                                
Roxana E. Lupu, Johns Hopkins University                              

Science Category: HII regions 
Dollars Approved: 65680.0 

Abstract:
We propose to compare Spitzer observations of molecular hydrogen,
PAHs, and thermal dust emission with recent studies of molecular
hydrogen and interstellar dust at ultraviolet wavelengths.  We will
use archival observations of six photodissociation regions to examine
the environmental dependences of PAH emission.  This will be
accomplished by looking for correlations between PAHs and fluorescent
molecular hydrogen, relative to the strength of the ultraviolet
radiation field and the nebular geometry.  This investigation would
provide a multi-wavelength observational base for future studies of
molecular hydrogen and dust grains in PDRs.