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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

References

Armstrong, J.W., Condes, J.M., and Rickett, B.J., 1981, Nature 291, 561.Google Scholar
Bregman, J.D., Troland, T.H., Forster, J.R., Schwarz, U.J., Goss, W.M., and Heiles, C., 1983, Astron. Astrophys. 118, 157.Google Scholar
Cowie, L.L. and McKee, C.F., 1977, Ap.J. 211, 135.Google Scholar
Cowie, L.L., 1980, Ap.J. 236, 868.Google Scholar
Crovisier, J. and Dickey, J.M., 1983, Astron. Astrophys. 122, 282.Google Scholar
Crovisier, J., Dickey, J.M. and Kazès, I., 1984, Astron. Astrophys., in preparation.Google Scholar
Dickey, J.M., 1979, Astrophys. J. 233, 558.Google Scholar
Dickey, J.M., 1984, in IAU Symposium No. 106, The Milky Way, ed. van Woerden, H. (Dordrecht: Reidel).Google Scholar
Field, G.B., Goldsmith, D.W., and Habing, H.J., 1969, Ap.J. Lett. 155, L149.CrossRefGoogle Scholar
Goldsmith, P.F., 1984, Icarus, in press.Google Scholar
Greisen, E.W., 1973, Astrophys. J. 184, 363 and 379.CrossRefGoogle Scholar
Jahoda, K., Dickey, J.M., Lockman, F.J., and McCammon, D., 1984, Astrophys. J. submitted.Google Scholar
Landecker, T.L., Roger, R.S., and Higgs, L.A., Astron. Astrophys. Suppl. 39, 133 (1980).Google Scholar
Larson, R.B., 1981, M.N.R.A.S. 194, 809.CrossRefGoogle Scholar
Liszt, H.S., Dickey, J.M., and Greisen, E.W., 1982, Ap.J. 261, 102.Google Scholar
Liszt, H.S., 1983, Ap.J. 275, 163.Google Scholar
Lockhart, I.A. and Goss, W.M., 1978, Astron. Astrophys. 67, 355.Google Scholar
McKee, C.F. and Ostriker, J.P., 1977, Astrophys. J. 218, 148.CrossRefGoogle Scholar
Myers, P.C., 1983, Astrophys. J. 270, 105.Google Scholar
Schwarz, U.J., Arnal, E.M., and Goss, W.M., 1980, M.N.R.A.S. 192, 678.Google Scholar
Verschuur, G.L., 1974, Astrophys. J. Suppl. 27, 65.Google Scholar