Detection of the 12.28 micron rotational line of molecular hydrogen in the Orion molecular cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Hydrogen Clouds, Interstellar Gas, Molecular Spectra, Orion Nebula, Emission Spectra, Line Spectra, Molecular Gases, Molecular Rotation, Vibrational Spectra

Scientific paper

The pure rotational S(2) transition of molecular hydrogen at 12.28 microns has been detected in emission from the region of vibrational-rotational line emission in Orion. The line was resolved both spectrally and spatially, and the line shapes, widths, and velocities are consistent with those observed in the upsilon = 1-0 transitions. The results put new constraints on the structure, temperature, and dynamics of the region of molecular hydrogen emission.

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