Fig. 9

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SKIRT radiative transfer results for the wedge torus model shown in Fig. 8, for a covering factor CF = 0.45, cos i = 0.4, and source parameters representative for Circinus AGN (Γ = 1.8, Ecut = 200 keV and L2-10 = 2.8 × 1042 erg s−1). The different panels represent different values for the equatorial hydrogen column density NH. Because of the torus symmetry, U is always zero. Positive values for the linear polarisation degree PL (purple line) denote polarisation in the north direction of the observer frame (γ = 0°), which is the direction of the torus symmetry axis projected on the sky. Negative PL values denote polarisation perpendicular to this projected symmetry axis, which is the horizontal direction in the observer frame (γ = 90°). The photon energy Eflip where the polarisation angle γ flips from 90° to 0° is indicated in green on all panels.
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