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Observations of Diffuse and Translucent Clouds

Published online by Cambridge University Press:  07 August 2017

Philippe Crane
Philippe Crane*
Affiliation:
European Southern Observatory Garching, Germany

Abstract

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Observations of interstellar CN, CH, and CH+ in diffuse and translucent clouds obtained with a spectral resolution of more the 500,000 are reported. First results from a survey of CH and CH+ are discussed. The CH+ isotopic ratio has been determined to be 68±5 toward ζ Oph and a component of 12CH+ has been found with a velocity width of 15 km s−1. A review of the rotational excitation temperature of interstellar CN and its implications is given.

Type
Diffuse, Translucent and High-Latitude Clouds
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 127 - 132
Copyright
Copyright © Kluwer 1992 

References

REFERENCES

1. Lambert, D.L., Sheffer, Y., and Crane, P., CN, CH, and CH + Toward Ophiuchi , Astrophysical Journal (Letters), 359, L19, 1990.Google Scholar
2. Langer, W.D., Glassgold, A.E., and Wilson, R.W., 1987, Radio Observations of Carbon Monoxide toward Zeta Ophiuchi: Velocity Structure, Isotopic Abundances, and Physical Properties Astrophysical Journal, 322, 450.CrossRefGoogle Scholar
3. Crutcher, R.M., and Federman, S.R., 1987, The CO J=2-1 Emission from the Interstellar Gas toward Zeta Ophiuchi , Astrophysical Journal (Letters), 316, L71.CrossRefGoogle Scholar
4. Hawkins, J., and Jura, M., 1987, The 12 C/13 C Ratio of the Interstellar Medium in the Neighborhood of the Sun. Astrophysical Journal, 317, 926.CrossRefGoogle Scholar
5. Stahl, O., Wilson, T.L., Henkel, C., and Appenzeller, I., 1989 CH + toward Zeta Oph Astronomy and Astrophysics, 221, 321.Google Scholar
6. Crane, P., Hegyi, D.J., Kutner, M.L., and Mandolesi, N., Cosmic Background Radiation Temperature at 2.64 Millimeters Astrophysical Journal, 346, 136, 1989 Google Scholar
7. Mather, J., et al., A Preliminary Measurement of the Cosmic Microwave Background Spectrum by the COBE Satellite , Astrophysical Journal (Letters), 354, L37, 1990.CrossRefGoogle Scholar
8. Gush, H.P., Halpern, M., and Wishnow, E.H., Rocket Measurement of the Cosmic Background Radiation mm Wave Spectrum , Physical Review Letters, 65, 537, 1990.Google Scholar
9. Palazzi, E., Mandolesi, N., and Crane, P., CN Rotational Excitation , Astrophysical Journal, submitted, 1992.CrossRefGoogle Scholar
10. Black, J.H., and van Dishoeck, E.F., Electron Densities and the Excitation of CN in Molecular Clouds , Astrophysical Journal (Letters), 369, L9, 1991.CrossRefGoogle Scholar