Abstract
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.
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References
Adams, W. W.: 1949, Astrophys J.109, 354.
Clark, B. G.: 1965, Astrophys. J.142, 1398.
Grahl, B. H., Hachenberg, D., and Mebold, U.: 1968, Beitr. Radioastronomie 1, 1.
Heiles, C.: 1967, Astrophys. J. Suppl.15, 136.
Hughes, M. P., Thompson, A. R., and Colvin, R. S.: 1971, Astrophys. J. Suppl.23, 323.
McGee, R. X. and Murray, J. D.: 1961, Australian J. Phys.14, 260.
Mebold, U.: 1972, Astron. Astrophys.19, 13.
Radhakrishnan, V., Murray, J. D., Lockhart, P., and Whittle, R. P. J.: 1972, Astrophys. J. Suppl.24, 15.
Takakubo, K.: 1968, Bull. Astron. Inst. Neth.20, 107.
Takakubo, K. and van Woerden, H.: 1966, Bull. Astron. Inst. Neth.10, 488.
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© 1974 IAU
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Radhakrishnan, V. (1974). The Observational Evidence for an Intercloud Medium. In: Kerr, F.J., Simonson, S.C. (eds) Galactic Radio Astronomy. International Astronomical Union/ Union Astronomique Internationale, vol 60. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2263-7_1
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DOI: https://doi.org/10.1007/978-94-010-2263-7_1
Publisher Name: Springer, Dordrecht
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