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The X-Ray Opacity of the Interstellar Medium+

Published online by Cambridge University Press:  25 September 2017

S.K. Ride  and
A.B.C. Walker Jr.
S.K. Ride
Affiliation:
Institute for Plasma Research, Stanford University, Stanford, California, U.S.A.
A.B.C. Walker Jr.
Affiliation:
Institute for Plasma Research, Stanford University, Stanford, California, U.S.A.

Extract

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In order to interpret soft X-ray spectra of cosmic X-ray sources, it is necessary to know the photoabsorption cross-section of the intervening interstellar material. Current models suggest that the interstellar medium contains two phases which make a substantial contribution to the X-ray opacity: cool, relatively dense clouds that exist in pressure equilibrium with hot, tenuous intercloud regions. We have computed the soft X-ray photoabsorption cross-section of each of these two phases. The calculations are based on a model of the interstellar medium which includes chemical evolution of the galaxy, the formation of molecules and grains, and the ionization structure of each phase.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 27
Copyright
Copyright © Crown Research Institutes 1977

Footnotes

*

Also Department of Physics.

**

Also Department of Applied Physics.

+

Paper will be presented by A.B.C. Walker, Jr.

References

+ Paper will be presented by A.B.C. Walker, Jr.