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HOT HYDROGEN IN DIFFUSE CLOUDS
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DOI：10.1088/0004-637X/755/2/119.png)
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Laboratory evidence suggests that recombination of adsorbed radicals may cause an abrupt temperature excursion of a dust grain to about 1000 K. One consequence of this is the rapid desorption of adsorbed H-2 molecules with excitation temperatures of this magnitude. We compute the consequences of injection of hot H-2 into cold diffuse interstellar gas at a rate of 1% of the canonical H-2 formation rate. We find that the level populations of H-2 in J = 3, 4, and 5 are close to observed values, and that the abundances of CH+ and OH formed in reactions with hot hydrogen are close to the values obtained from observations of diffuse clouds.
Keyword:
infrared: diffuse background
infrared: ISM
ISM: lines and bands
ISM: molecules
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期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
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