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The Observational Evidence for an Intercloud Medium

Published online by Cambridge University Press:  14 August 2015

V. Radhakrishnan
V. Radhakrishnan*
Affiliation:
Raman Research Institute, Bangalore, India

Abstract

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The 21-cm evidence for an intercloud medium is reviewed. The observations include the sky distribution and velocity structure of 21-cm emission profiles, self-absorption features in emission profiles, and absorption profiles in the directions of discrete sources. It is concluded that the intercloud medium in the solar neighbourhood has a temperature between 103 and 104 K, a column density of ~1.4 × 1020 cosec |b| atoms cm-2, and a brightness temperature of ~4.4 cosec |b| K wherever the line of sight does not intersect optically thick cold concentrations.

Type
Part 1: The Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 60: Galactic Radio Astronomy , 1974 , pp. 3 - 12
Copyright
Copyright © Reidel 1974 

References

Adams, W. W.: 1949, Astrophys J. 109, 354.Google Scholar
Clark, B. G.: 1965, Astrophys. J. 142, 1398.Google Scholar
Grahl, B. H., Hachenberg, D., and Mebold, U.: 1968, Beitr. Radioastronomie 1, 1.Google Scholar
Heiles, C.: 1967, Astrophys. J. Suppl. 15, 136.Google Scholar
Hughes, M. P., Thompson, A. R., and Colvin, R. S.: 1971, Astrophys. J. Suppl. 23, 323.Google Scholar
McGee, R. X. and Murray, J. D.: 1961, Australian J. Phys. 14, 260.Google Scholar
Mebold, U.: 1972, Astron. Astrophys. 19, 13.Google Scholar
Radhakrishnan, V., Murray, J. D., Lockhart, P., and Whittle, R. P. J.: 1972, Astrophys. J. Suppl. 24, 15.Google Scholar
Takakubo, K.: 1968, Bull. Astron. Inst. Neth. 20, 107.Google Scholar
Takakubo, K. and van Woerden, H.: 1966, Bull. Astron. Inst. Neth. 10, 488.Google Scholar