Observations of radio recombination lines in the millimeter-wave spectrum of Orion A

Details Observations of radio recombination lines in the millimeter-wave spectrum of Orion A Observations of radio recombination lines in the millimeter-wave spectrum of Orion A

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146l..19h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. L19-L21.

Astronomy and Astrophysics

Astrophysics

11

H Lines, Hydrogen Clouds, Millimeter Waves, Molecular Clouds, Orion Constellation, Radio Spectra, H Alpha Line, Line Spectra, Quantum Numbers, Thermodynamic Equilibrium

Scientific paper

The authors have observed the H 42α, 40α, 39α, 52β, 57γ, and 60γ lines in the direction of the molecular cloud in Orion A. From the alpha line data, the derived values of the electron temperature, assuming local thermodynamic equilibrium (LTE), are close to 10000K, significantly higher than values ≅8500K, inferred from optical studies. The authors interpret this as an evidence for a significant deviation from LTE. This is confirmed by the analysis of the higher order lines, and is consistent with the recent results of Wilson and Pauls (1984). The importance of observations in the millimeter-wave spectrum is discussed.

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