Detection of new, high excitation, emission lines of H2 in the 2.0-2.4 micron spectrum of the Orion nebula

Details Detection of new, high excitation, emission lines of H2 in the 2.0-2.4 micron spectrum of the Orion nebula Detection of new, high excitation, emission lines of H2 in the 2.0-2.4 micron spectrum of the Orion nebula

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197..261o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 261-265.

Astronomy and Astrophysics

Astrophysics

9

Emission Spectra, Hydrogen, Infrared Spectra, Line Spectra, Orion Nebula, Astronomical Spectroscopy, High Resolution, Infrared Radiation, Molecular Clouds

Scientific paper

The authors present high sensitivity, high resolution (λ/Δλ ≅ 1500) spectral observations between 2.0 and 2.4 μm on the position of peak H2 emission in the Orion nebula. All the 13 emission lines detected can be attributed to vibrational-rotational transitions connecting the first three vibrational levels of H2. Amongst them are several lines arising from the third vibrational level (υ = 3) which have been detected for the first time. The relative intensities of all the transitions can be fitted assuming collisional populations of the H2 levels in a gas which is at ≅ 1000K except for a small fraction (< 1%) at ≡ 3000K. Transitions from higher levels, which are expected to have intensities comparable to the observed υ = 3-2 lines under ultraviolet (fluorescence) excitation, were not detected. The upper limit to the contribution of UV excited lines cannot therefore exceed ≡ 10% of the flux observed in the υ = 3→2 transitions and their contribution to the lower vibrational transitions should be negligible.

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