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Comparison of submillimeter and ultraviolet observations of neutral carbon toward Zeta Ophiuchi
Keene, Jocelyn; Blake, Geoffrey A.; Phillips, T. G.
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena), AC(California Institute of Technology, Pasadena)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 396-399. (ApJ Homepage)
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NASA/STI Keywords:
Carbon, Interstellar Matter, Neutral Atoms, Ophiuchi Clouds, Submillimeter Waves, Ultraviolet Spectra, Atomic Energy Levels, Signal To Noise Ratios
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The 3P1 yields 3P0 line of neutral C I toward Z Oph was observed at 492 GHz to demonstrate that C I column densities and line velocity measurements can be made with both submillimeter and UV techniques. The data were collected with an InSb cyclotron-resonance heterodyne receiver on the NASA Kuiper Airborne Observatory at an altitude of 12.5 km. The radio data densities were compared with densities calculated from Copernicus satellite UV data. It was found that the radio data densities improved that accuracy of column densities previously determined from UV measurements. It is concluded that follow-up high resolution submillimeter data are a useful aid in the interpretation of UV data on column densities.

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