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The Dust Opacity of Spiral Galaxies

Published online by Cambridge University Press:  25 April 2016

Y. I. Byun  and
K. C. Freeman
Y. I. Byun
Affiliation:
Mount Stromlo and Siding Spring Observatories, Private Bag, Weston ACT 2611
K. C. Freeman
Affiliation:
Mount Stromlo and Siding Spring Observatories, Private Bag, Weston ACT 2611
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Abstract

In order to find the best observable diagnostics for the amount of internal extinction within spiral galaxies, we have constructed models for disk galaxies with immersed dust layers. The radiative transfer problem, including both scattering and pure absorption, has been computed for a range of model galaxies. This reveals a set of superior diagnostics for the opacity. These include the behaviour of the radial colour and luminosity distributions, the amplitude of the asymmetry between the near and far sides of the major axis, and their dependence on the orientation of the galaxy with respect to the observer.

Type
Extragalactic
Information
Publications of the Astronomical Society of Australia , Volume 9 , Issue 1 , 1991 , pp. 86 - 88
Copyright
Copyright © Astronomical Society of Australia 1991

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