Detection of the 370 micron 3P2-3P1 fine-structure forbidden line of C I

Details Detection of the 370 micron 3P2-3P1 fine-structure forbidden line of C I Detection of the 370 micron 3P2-3P1 fine-structure forbidden line of C I

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290l..59j&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 290, March 15, 1985, p. L59-L62.

Astronomy and Astrophysics

Astrophysics

38

Abundance, Carbon, Forbidden Transitions, Infrared Spectra, Interstellar Gas, Optical Thickness, Orion Nebula, Brightness Temperature, Fine Structure, H Ii Regions, Molecular Clouds, Submillimeter Waves

Scientific paper

The authors report here the first detection of the 370 μm (809 GHz) 3P2 - 3P1 fine-structure transition of neutral carbon. The detection of this line confirms the identification of the line seen at 492 GHz by Phillips et al. as the 3P1 - 3P0 line of [C I]. The observations toward the core of the Orion molecular cloud show a line brightness temperature 1.7±0.5 times that of the previously detected 3P1 - 3P0 line. If both transitions arise in a single emission region that fills the beams used in the observations, an optically thin region with a temperature ≥300K is the best explanation of the observed line ratio. The most likely location for a warm optically thin region is in the interface between the Orion H II region and the massive molecular cloud that lies behind it. The possibility that the [C I] emission may arise from an optically thick ≡25K region is also discussed.

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