Abstract
view Abstract Citations (11) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the intensities of decimetric-wavelength radio recombination lines. Parrish, A. ; Pankonin, V. Abstract 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. Publication: The Astrophysical Journal Pub Date: June 1975 DOI: 10.1086/153609 Bibcode: 1975ApJ...198..349P Keywords: 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; Astrophysics full text sources ADS | data products SIMBAD (9)
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