Fig. 2

Left: mass opacities for scattering κsca (short-dashed ocher), absorption κabs (long-dashed red), and extinction κext = κabs + κsca (solid blue) for a dust model with grain sizes between amin = 5 nm and amax = 6 μm, leading to anopacity index of β = 0.8. The shaded areas indicate the wavelength regimes where dust polarization may be dominated by dichroic extinction (light blue), scattering (light yellow), and emission (light red). The shaded areas are estimated under the assumption that the product of dust number density ρdust and path length ℓ gives ρdust × ℓ ≈ 1 g cm−2 (see Sect. 4.6 and Reissl et al. (2014) for further details). Right: same as the left panel, but with an upper grain size of amax = 100 μm, corresponding to an opacity index of β = 1.3.
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