ar X iv : a st ro - p h / 00 01 29 6 v 1 1 7 Ja n 20 00 H 2 emission as a diagnostic of physical processes in starforming galaxies By Paul
نویسنده
چکیده
Observations and interpretation of extragalactic rotational and rovibrational H2 emission are reviewed. Direct observations of H2 lines do not trace bulk H2 mass, but excitation rate. As such, the H2 lines are unique diagnostics, if the excitation mechanism can be determined, which generally requires high-quality spectroscopy and suitable additional data. The diagnostic power of the H2 lines is illustrated by two cases studies: H2 purely rotational line emission from the disk of the nearby spiral galaxy NGC 891 and high resolution imaging and spectroscopy of H2 vibrational line emision from the luminous merger NGC 6240.
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