The Molecular Hydrogen Emission Associated with the Orion Bright Star

Details The Molecular Hydrogen Emission Associated with the Orion Bright Star The Molecular Hydrogen Emission Associated with the Orion Bright Star

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215p..31h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 215, NO.1/JUL01, P. 31P, 1985

Astronomy and Astrophysics

Astronomy

71

Scientific paper

The authors have measured nine infrared spectra along a strip which crosses the Orion bright bar ionization front. Emission from vibrationally excited molecular hydrogen is widespread. The molecular gas is excited both by shocks and by absorption of ultraviolet radiation. The shocked gas lies in a layer outside the ionization front; the shock is probably driven by the expansion of the H II region. The radiatively excited gas is present at every position measured, although no significant enhancement is found at the optical ionization front. This suggests that the molecular gas between the ionization front and the shock is dissociated. The authors note that line ratio measurements of the molecular hydrogen emission are crucial to the determination of the excitation mechanism.

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