The electron temperatures of H II regions determined from radio recombination line observations at 22 GHz

Details The electron temperatures of H II regions determined from radio recombination line observations at 22 GHz The electron temperatures of H II regions determined from radio recombination line observations at 22 GHz

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..205w&link_type=abstract

Astronomy and Astrophysics, vol. 71, no. 1-2, Jan. 1979, p. 205-210.

Astronomy and Astrophysics

Astrophysics

47

Electron Energy, H Ii Regions, Radial Velocity, Radiative Recombination, Spectral Line Width, Angular Resolution, Flux Density, High Frequencies, Line Spectra, Noise Temperature, Normal Density Functions, Recombination Coefficient, Stark Effect, Temperature Gradients, Thermodynamic Equilibrium

Scientific paper

Radial velocities, line widths, and LTE electron temperatures obtained from H66-alpha and H83-beta radio recombination-line observations and radio continuum measurements are presented for 15 galactic H II regions observed at 22.4 GHz with a resolution of about 43 arcsec. The H83-beta/H66-alpha line intensity ratio is measured for five sources and shown to be consistent with LTE. An average LTE electron temperature of 7900 K is determined for the surveyed sources; it is concluded that there are no large electron-temperature gradients in these sources and that the effects of source geometry are small at 22.4 GHz. The data are compared with previous observations of the H109-alpha and H137-beta radio recombination line. The H66-alpha results are found to be consistent with a proposed gradient in the electron temperatures of H II regions with distance from the galactic center.

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