Millimeter-wave recombination lines from radio-bright H II regions

Details Millimeter-wave recombination lines from radio-bright H II regions Millimeter-wave recombination lines from radio-bright H II regions

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..782g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 782-794.

Astronomy and Astrophysics

Astrophysics

16

H Ii Regions, Millimeter Waves, Radio Spectra, Electron Density (Concentration), Electron Energy, Quantum Numbers, Thermodynamic Equilibrium, Ultraviolet Radiation

Scientific paper

This paper presents new observations of radio recombination lines in the millimeter-wavelength regime from the radio-bright H II regions W3 Main, NGC 1976, NGC 2024, Sgr B2, M17, W49A, and W75/DR21. Mean values for the electron temperature and density averaged along the lines of sight are obtained, and the (He+)/(H+) ratio is measured as a function of galactocentric distance. Excluding NGC 2024, an average value and a galactocentric radius for (He+)/(H+) of 0.103 + or - 0.031 and 0.00924/kpc, respectively, are found.

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