Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90...34s&link_type=abstract
Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p. 34-43.
Astronomy and Astrophysics
Astrophysics
40
Astronomical Spectroscopy, H Ii Regions, Line Spectra, Nebulae, Radio Emission, Thermodynamic Equilibrium, Continuous Spectra, Electron Recombination, Milky Way Galaxy, Stimulated Emission
Scientific paper
There is no evidence for significant deviations from LTE in single-dish observations of radio recombination line emission from galactic H II regions. This is in agreement with the known properties of H II regions, particularly their density variations and limited range of excitation parameters; the optimum configuration for strong observable non-LTE effects, low electron density and high emission measure, simply does not exist in galactic H II regions, and the observed lines are emitted under near-LTE conditions. Models of the Orion Nebula and NGC 6604 are presented which fit all available data and show only weak stimulated emission. It is concluded that reliable electron temperatures can indeed be obtained from straightforward analysis of appropriate radio recombination lines.
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