51.8 micron forbidden O III line emission observed in four galatic H II regions

Details 51.8 micron forbidden O III line emission observed in four galatic H II regions 51.8 micron forbidden O III line emission observed in four galatic H II regions

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..35m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 1, 1979, p. L35-L38.

Astronomy and Astrophysics

Astrophysics

22

Galactic Structure, H Ii Regions, Infrared Spectra, Interstellar Gas, Oxygen Spectra, Emission Spectra, Forbidden Transitions, Line Spectra, Oxygen Ions

Scientific paper

The 51.8-micron forbidden O III line has been detected in four H II regions: M42, M17, W51, and NGC 6357A. The respective line strengths are 7 x 10 to the -15th, 1.0 x 10 to the -14th, 2.1 x 10 to the -15th, and 2.6 x 10 to the -15th W/sq cm. The observations are consistent with a previously reported line position and place the line at 51.80 + or - 0.05-micron. When combined with the 88.35-micron forbidden O III observations reported earlier, clumpiness is found to be an important factor in NGC 6357A and M42 and nonnegligible in W51 and M17. The combined data also suggest an O III abundance of about 0.0003 times the electron density, which is a factor of 2 greater than a number of investigators have reported.

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