Other
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..419h&link_type=abstract
Astrophysical Journal, Part 1, vol. 216, Sept. 1, 1977, p. 419-426.
Other
139
Hydrogen, Molecular Gases, Molecular Oscillations, Nebulae, Astronomical Models, Molecular Excitation, Molecular Pumps, Near Ultraviolet Radiation, Shock Wave Propagation, Spectral Line Width
Scientific paper
Physical mechanisms for producing vibrationally excited molecular hydrogen, such as has recently been detected toward the Orion Nebula, are discussed. The most likely mechanisms are collisional excitation behind a shock moving into a molecular cloud and near-ultraviolet pumping in the H2 Lyman and Werner bands and subsequent cascade. The absolute intensities of the Orion lines require either a 10-km/s shock moving into a cloud with a density of 300,000 per cu cm or an incident near-UV flux 1 million times the mean interstellar value. The shock model is favored because it matches the observed relative line intensities and because the near-UV source, Theta-1 Ori C, may be too weak to provide the required flux. Intensities of other H2 lines in the shock model are predicted as a further observational discriminant.
Hollenbach David J.
Shull Michael J.
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