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On the physical conditions in interstellar H I gas

Published online by Cambridge University Press:  14 August 2015

M. Grewing ,
U. Mebold  and
K. Rohlfs
M. Grewing
Affiliation:
Max Planck-Institut für Radioastronomie und Institut für Astrophysik, Bonn, Germany
U. Mebold
Affiliation:
Max Planck-Institut für Radioastronomie und Institut für Astrophysik, Bonn, Germany
K. Rohlfs
Affiliation:
Max Planck-Institut für Radioastronomie und Institut für Astrophysik, Bonn, Germany

Abstract

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Weighted average values of the ionization ratio ne/nH for the interstellar gas can be obtained from a comparison of pulsar data and 21-cm emission measurements. For high latitude pulsars this procedure is straight forward and reasonably free from assumptions. The resulting ionization ratios are high (ne/nH = 0.39). If this is compared with values as given by the theory of ionization and heating of interstellar gas by subcosmic rays, temperatures for the ‘neutral’ gas above 104 K are obtained. For low latitude pulsars this procedure depends to a much larger extend on the assumed distance of the objects and on the ionization theory. Here the values found are ne/nH = 0.07 and Te = 2000 K.

Type
Part II/Observations of Spiral Structure in Our Galaxy
Information
Symposium - International Astronomical Union , Volume 38: The Spiral Structure of our Galaxy , 1970 , pp. 182 - 185
Copyright
Copyright © Reidel 1970 

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