R=100,000 Spectroscopy of Photodissociation Regions: H2 Rotational Lines in the Orion Bar

Katelyn N. Allers, Daniel T. Jaffe, John H. Lacy +1

Ground state rotational lines of H2 are good temperature probes of moderately hot (200-1000 K) gas. The low A-values of these lines result in low critical densities while ensuring…