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Optical Observations related to the Molecular Chemistry in Diffuse Interstellar Clouds

Published online by Cambridge University Press:  04 August 2017

S. R. Federman
S. R. Federman*
Affiliation:
M. S. 183-601, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive Pasadena, CA 91109 USA

Abstract

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Observations, which have been published since 1979, of molecular species in diffuse clouds will be discussed. Particular attention will be given to the ultraviolet measurements of CO with the Copernicus and IUE satellites and to ground-based optical measurements of CH, CH+, CN, and C2. These data encompass large enough samples to test the chemical schemes expected to occur in diffuse clouds. Upper limits for other species (e.g., H2O, H2O+, and C3) place restrictions on the pathways for molecular production. Moreover, analysis of the rotational distribution of the C2 molecule results in the determination of the physical conditions of the cloud. These parameters, including density, temperature, and the intensity of the radiation field, are necessary for modeling the chemistry.

Type
Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 120: Astrochemistry , 1987 , pp. 123 - 131
Copyright
Copyright © Reidel 1987 

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