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- W4256124636 abstract "Abstract We review new observational and theoretical developments of the understanding of the H 2 infrared emission in the last 5 years since the discovery of the fluorescent emission in NGC 2023. An excitation analysis of H 2 in a variety of Galactic sources has revealed that in many sources the excitation is expressed as a mixture of thermal and fluorescent components. This finding is in good agreement with theories of photodissociation regions, in which the population of H 2 changes its character from pure fluorescence to thermal as the density of the region increases. The ortho/para abundance ratio of the fluorescent H 2 is observed to lie within a limited range of 1.1 — 1.8 which is well reproduced by depth-dependent model calculations of the ultraviolet excitation and dissociation of H 2 molecules. This may be understood as due to the independent self shielding of each of the ortho- and para-H 2 , rather than the ortho/para abundance ratio of the predissociated H 2 , a low formation temperature of H 2 on grains, or gas phase interchange reactions. A laser emission of molecular hydrogen discovered in the planetary nebula NGC7027 further demonstrates the nonthermal nature of the H 2 emission in photodissociation regions." @default.
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- W4256124636 date "1989-01-01" @default.
- W4256124636 modified "2023-10-18" @default.
- W4256124636 title "Molecular Hydrogen Emission from Photodissociation Regions" @default.
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- W4256124636 doi "https://doi.org/10.1017/s0252921100023447" @default.
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