Spitzer IRAC Color Diagnostics for Extended Emission in Star Forming
  Regions
  The infrared data from the Spitzer Space Telescope has provided an invaluable
tool for identifying physical processes in star formation. In this study we
calculate the IRAC color space of UV fluorescent molecular hydrogen (H$_2$) and
Polycyclic Aromatic Hydrocarbon (PAH) emission in photodissociation regions
(PDRs) using the Cloudy code with PAH opacities from Draine & Li 2007. We
create a set of color diagnostics that can be applied to study the structure of
PDRs and to distinguish between FUV excited and shock excited H$_2$ emission.
To test this method we apply these diagnostics to Spitzer IRAC data of NGC
2316. Our analysis of the structure of the PDR is consistent with previous
studies of the region. In addition to UV excited emission, we identify shocked
gas that may be part of an outflow originating from the cluster.
