Theoretical Models of Photodissociation Fronts

Details Theoretical Models of Photodissociation Fronts Theoretical Models of Photodissociation Fronts

2000-08-09

arxiv.org/abs/astro-ph/0008149v1

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, uses cupconf.sty and psfig.sty. To appear in H2 in Space, ed. F. Combes & G. Pineau des Forets (Cambridge

Scientific paper

Observations of H2 line emission have revealed higher-than-expected gas temperatures in a number of photodissociation fronts. We discuss the heating and cooling processes in photodissociation regions. Observations of NGC 2023 are compared to a theoretical model in which there is substantial gas at temperatures T = 500-1000K heated by photoelectric emission and collisional deexcitation of H2. In general the model successfully reproduces the observed H2 line emission from a wide range of energy levels. The observed [SiII]34.8um emission appears to indicate substantial depletion of Si in NGC 2023.

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