Observations of forbidden S III 18.71-micron emission in galactic H II regions

Details Observations of forbidden S III 18.71-micron emission in galactic H II regions Observations of forbidden S III 18.71-micron emission in galactic H II regions

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..711m&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 711-719.

Astronomy and Astrophysics

Astronomy

18

H Ii Regions, Infrared Spectra, Line Spectra, Orion Nebula, Sulfur, Abundance, Interstellar Matter, Radio Astronomy, Tables (Data)

Scientific paper

Emission of forbidden S III 18.71-micron radiation has been detected in the Orion Nebula, M17, NGC 2024, and W51, and an upper limit has been set for Sgr A. The line flux from M17 has been mapped with a resolution of 2.7 arcmin. A simple theory for predicting the forbidden S III flux from radio continuum observations is presented and compared with the data. It is found that Orion and M17 are in satisfactory agreement with the observations and that NGC 2024 is consistent with a low-excitation source behind a resonable amount of 18-micron dust extinction. In W51 the low observed flux may be explained either by low S(2+) abundance or, more likely, by dust extinction. In Sgr A attenuation by dust is the most plausible explanation.

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