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The optical depth of the 158 micron forbidden C-12 II line - Detection of the F = 1 - 0 forbidden C-13 II hyperfine-structure component
Stacey, G. J.; Townes, C. H.; Poglitsch, A.; Madden, S. C.; Jackson, J. M.; Herrmann, F.; Genzel, R.; Geis, N.
AA(California, University, Berkeley), AB(California, University, Berkeley), AC(California, University, Berkeley), AD(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AE(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AF(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AG(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AH(Boston, University, MA)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. L37-L41. (ApJL Homepage)
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NASA/STI Keywords:
Carbon, Infrared Spectra, Interstellar Matter, Orion Nebula, Hyperfine Structure, Line Spectra, Optical Thickness
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The detection of the F = 1 - 0 hyperfine component of the 158-micron forbidden C-13 II fine-structure line in the interstellar medium is reported. A 12-point intensity map was obtained of the forbidden C-13 distribution over the inner 190-arcsec (R.A.) X 190-arcsec (decl.) regions of the Orion Nebula using an imaging Fabry-Perot interferometer. The forbidden C-12 II/C-13 II line intensity ratio varies significantly over the region mapped. It is highest (86 +/-0) in the core of the Orion H II region, and significantly lower (62 +/-7) in the outer regions of the map, reflecting higher optical depth in the forbidden C-12 II line here. It is suggested that this enhanced optical depth is the result of limb brightening of the optically thin forbidden C-13 II line at the edges of the bowl-shaped H II region blister.

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