Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..442l&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 442-447.
Astronomy and Astrophysics
Astronomy
83
Astronomical Spectroscopy, Infrared Astronomy, Nebulae, Shock Wave Propagation, Astronomical Models, Hydrogen, Line Spectra, Molecular Spectra, Plane Waves, Steady Flow, Thermodynamic Equilibrium
Scientific paper
A shock model is considered for the H2 infrared line emission detected in the Orion Nebula by Gautier et al. (1976). The equations are solved which describe stationary gas flow and excitation of H2 in the radiative cooling region behind a shock. It is found that for the high densities needed to explain the observed line strengths, the populations of the vibration-rotation levels are nearly in LTE. By matching the calculated line strengths to the observations, it is found that the acceptable values of shock velocity and upstream molecular density must be between 8 and 21 km/s and between 100,000 and 1 million per cu cm, respectively.
Chu Shih-I
London Richard
McCray Richard
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