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• W4312191741 endingPage "3256" @default.
• W4312191741 startingPage "3237" @default.
• W4312191741 abstract "We present polarimetric maps of the Circinus galaxy nucleus in the $BVRI$ bands, obtained with VLT/FORS2. Circinus is the closest Seyfert 2 galaxy and harbours an archetypal obscured active galactic nucleus (AGN). Recent high angular resolution imaging revealed that a major fraction of its mid-infrared (MIR) emission is coming from the polar region. Previously, we demonstrated that these observations are consistent with a model of a compact dusty disc and a hyperboloid shell, resembling a hollow cone on larger scales. Here we focus on the AGN core, up to 40 pc from the central engine, and compare the observations to the radiative transfer models. Polarization maps reveal a conical structure, coinciding with the ionization cone. The wavelength-dependence of the polarization degree indicates that scattering on dust grains is producing polarization. The observed polarization degree ($approx1-3%$) is lower than predicted by the models; however, this is only a lower limit, since stellar emission dominates the total flux in the optical. The observed polarization angle ($approx30$ degrees) is reproduced by the model of a dusty disc with a hollow cone that is illuminated by a tilted anisotropic central source. An accretion disc aligned with the ionization cone axis, and alternative dust geometries, such as a paraboloid shell, or a torus enveloped by ambient dust, are inconsistent with the data. We conclude that the optical polarimetric imaging supports earlier evidence for the presence of dust in the polar region, tentatively associated with dusty outflows." @default.
• W4312191741 created "2023-01-04" @default.
• W4312191741 creator A5001973306 @default.
• W4312191741 creator A5020004672 @default.
• W4312191741 creator A5028322180 @default.
• W4312191741 creator A5039295920 @default.
• W4312191741 creator A5065764349 @default.
• W4312191741 creator A5075794938 @default.
• W4312191741 creator A5081001890 @default.
• W4312191741 date "2022-12-21" @default.
• W4312191741 modified "2023-09-24" @default.
• W4312191741 title "Dissecting the active galactic nucleus in Circinus – III. <i>VLT/FORS2</i> polarimetry confirms dusty cone illuminated by a tilted accretion disc" @default.
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