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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 

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