Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.182..473p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 182, Feb. 1978, p. 473-488.
Astronomy and Astrophysics
Astronomy
28
Galactic Nuclei, Line Spectra, Low Frequencies, Milky Way Galaxy, Radiative Recombination, Cold Gas, Electron Density (Concentration), H Ii Regions, Pressure Broadening, Radio Sources (Astronomy), Recombination Reactions, Stimulated Emission, Thermodynamic Equilibrium
Scientific paper
Recombination lines at 242, 328, and 408 MHz are reported from the direction of the Galactic Center and the H II regions W35 and W43. The lines from the direction of the Galactic Center can only be explained in terms of stimulated emission which appears to originate in an extended low-density low-emission-measure H II region in the line of sight to the Galactic Center. The recombination lines from W35 are not strongly enhanced by stimulated-emission effects and are consistent with an electron temperature of approximately 4000 K. None of the low-frequency lines of the three sources studied shows significant pressure broadening.
Davies Rhodri D.
Hart L.
Pedlar Alan
Shaver Peter A.
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