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Astron. Astrophys. 324, 32-40 (1997)

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Appendix A: radiative transfer model

A `Sandwich configuration' for the star and dust distribution in a model galaxy is adopted (Paper I). It is a plane-parallel-slab of uniformly mixed stars and dust sandwiched within two stellar slabs. The stars in the central slab contribute half of the total emission, while each of the outer stellar slab contributes a quarter of the emission. The model takes the effect of scattering fully into account in the sense that scattered light of any order has been calculated using an iteration procedure from lower order scattered light (van de Hulst & de Jong 1969). The albedo of [FORMULA] and the asymmetry factor of [FORMULA] are taken from the Solar Neighbourhood values (Mathis et al. 1983). Fig. 9 shows the plot of the resulted [FORMULA] versus [FORMULA], where [FORMULA] is the face-on optical depth and [FORMULA] the inclination angle. Fig. 10 shows the plot of the resulted [FORMULA] versus the inclination parameter of [FORMULA].

[FIGURE] Fig. 9. Plot of [FORMULA] versus [FORMULA] for the model, where [FORMULA] is the face-on optical depth and [FORMULA] the inclination angle. Different curves are model calculations with different inclination parameter [FORMULA], as denoted by the numbers.
[FIGURE] Fig. 10. Plot of [FORMULA] versus the inclination parameter [FORMULA]. Different curves are model calculations with different face-on optical depth [FORMULA], as denoted by the numbers.
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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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