Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..349p&link_type=abstract
Astrophysical Journal, vol. 198, June 1, 1975, pt. 1, p. 349-354.
Astronomy and Astrophysics
Astronomy
10
Brightness Temperature, Decimeter Waves, Line Spectra, Nebulae, Radiative Recombination, Radio Sources (Astronomy), Atomic Recombination, Continuous Spectra, Emission Spectra, Error Analysis, Frequency Response, H Ii Regions, Interstellar Gas, Luminous Intensity, Optical Thickness, Radio Telescopes
Scientific paper
Results are reported for decimetric wavelength recombination-line (166-, 221-, and 248-alpha) observations of W49 and W51 which were made with the Arecibo and NRAO telescopes. Data from previous recombination-line programs are discussed, and the brightness temperatures of the present lines are calculated. The brightness temperatures are found to increase sharply with wavelength, which requires that the upper levels of the recombining atoms be overpopulated with respect to conditions of local thermodynamic equilibrium. It is suggested that the line emission at these decimetric wavelengths is stimulated by a background source of continuum radiation, most likely the H II region in the line of sight.
Pankonin Vernon
Parrish Andrew
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