Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..476s&link_type=abstract
Nature, vol. 280, Aug. 9, 1979, p. 476, 477.
Physics
19
Cold Gas, Electron Energy, Line Spectra, Microwave Spectra, Nebulae, Brightness, Orion Nebula, Temperature Distribution
Scientific paper
Radio recombination line observations of several low-density nebulae are made, in order to determine the electron temperatures in the absence of such effects as collisional de-excitation, stimulated emission, and pressure broadening. Two nebulae, RCW94 and G339.1-0.2, are examined in detail. Their most striking feature is the width of their spectral lines (14.9 km/s), determined by employing two simultaneous 512-channel spectra of a 10 MHz band, containing the H109 alpha, H137 beta, and He109 alpha lines. The measured electron temperatures were found to be 4,600 K for RCW94 and 3800 K for G339.1-0.2. These relatively low temperatures are caused by a high metal abundance, which was found to be higher than the solar values by a factor of 4 to 5.
McGee Richard X.
Pottasch Stuart R.
Shaver Peter A.
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