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The Smallest Sizes of Diffuse Interstellar Clouds

Published online by Cambridge University Press:  12 April 2016

John M. Dickey ,
J. Crovisier  and
I. Kazes
John M. Dickey
Affiliation:
University of Minnesota, Obs. Paris
J. Crovisier
Affiliation:
University of Minnesota, Obs. Paris
I. Kazes
Affiliation:
University of Minnesota, Obs. Paris

Abstract

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By observing the difference in optical depths between absorption spectra toward the two components of double sources we have measured the variations in opacity over lengths of less than 0.1 up to 10 pc inside diffuse interstellar clouds. Significant variations are detected on scales larger than about 0.2 pc, but not less. This may represent the minimum size for diffuse cloud structure. By comparing the variations of Gaussian fitted line parameters we find that variations in the internal velocity field of diffuse clouds explain the data rather better than tiny independent “cloudlets.”

Type
The LISM at Radio Wavelengths
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 258 - 262
Copyright
Copyright © NASA 1984

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