Observations of radio recombination lines at about 300 MHz

Details Observations of radio recombination lines at about 300 MHz Observations of radio recombination lines at about 300 MHz

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..319p&link_type=abstract

Astronomy and Astrophysics, vol. 58, no. 3, June 1977, p. 319-323. NSF-supported research.

Astronomy and Astrophysics

Astronomy

5

Astronomical Spectroscopy, Atomic Recombination, Line Spectra, Radio Sources (Astronomy), Carbon, Electron Density (Concentration), Emission Spectra, H Alpha Line, H Ii Regions, Thermodynamic Equilibrium

Scientific paper

Radio recombination-line observations at about 318 MHz are reported. H274-alpha lines were detected in the directions of the H II regions W51B and W49A. The hydrogen line observed toward W51B probably originates in an extended low-density H II region which is positionally associated with smaller discrete H II regions in that source. The hydrogen emission observed toward W49A probably arises in a source located about half the distance to the discrete H II region W49A. No carbon lines were detected at 274-alpha. The upper limits on the carbon line emission, together with previous observations of the C II regions at these positions at 430 MHz, suggest that a turnover in the C-line intensity occurs between 248-alpha and 274-alpha. These data, when reduced for comparison with available LTE departure coefficients, indicate electron densities of 0.2 to 0.5 per cu cm for these C II regions.

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