Theoretical Models of Photodissociation Fronts

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dc.creatorDraine, B. T.
dc.creatorBertoldi, Frank
dc.date2000-08-09
dc.date.accessioned2026-07-07T01:54:53Z
dc.date.available2026-07-07T01:54:53Z
dc.descriptionObservations 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.
dc.description8 pages, 6 figures, uses cupconf.sty and psfig.sty. To appear in H2 in Space, ed. F. Combes & G. Pineau des Forets (Cambridge Univ. Press)
dc.identifierhttps://arxiv.org/abs/astro-ph/0008149
dc.identifierhttp://arxiv.org/abs/astro-ph/0008149
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1463
dc.subjectAstrophysics
dc.titleTheoretical Models of Photodissociation Fronts
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