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• W2116483681 abstract "Context. Spectropolarimetry of AGNs is a powerful tool for studying the structure and kinematics of the inner regions of quasars. Aims. We wish to investigate the effects of various AGN scattering region geometries on the polarized flux. Methods. We introduce a new, publicly available Monte Carlo radiative transfer code, Stokes, which models polarization induced by scattering off free electrons and dust grains. We model a variety of regions in AGNs. Results. We find that the shape of the funnel of the dusty torus has a sign ificant impact on the polarization e ffi ciency. A compact torus with a steep inner surface scatters more light toward t ype-2 viewing angles than a large torus of the same half-opening angle, �0. For �0 60 ◦ it is polarized parallel to the symmetry axis. In between these intervals the orientation of the polarization depends on the viewing angle. The degree of polarization ranges between 0% and 20% and is wavelength independent for a large range of �0. Observed wavelength-independent optical and near-UV polarization thus does not necessarily imply electron scattering. Spectropolarimetry at rest-fr ame wavelengths less than 2500 A may distinguish between dust and electron scattering but is not conclusive in all cases. For polar dust, s cattering spectra are reddened for type-1 viewing angles, and made bluer for type-2 viewing angles. Polar electron-scattering co nes are very effi cient polarizers at type-2 viewing angles, whilst the polar ized flux of the torus is weak. Conclusions. We predict that the net polarization of Seyfert-2 galaxies decreases with luminosity, and conclude that the degree of polarization should be correlated with the relative streng th of the thermal IR flux. We find that a flattened, equatorial, e lectronscattering disk, of relatively low optical depth, reproduc es type-1 polarization. This is insensitive to the exact geo metry, but the observed polarization requires a limited range of optical d epth." @default.
• W2116483681 created "2016-06-24" @default.
• W2116483681 creator A5029037525 @default.
• W2116483681 creator A5031697761 @default.
• W2116483681 date "2007-04-01" @default.
• W2116483681 modified "2023-09-24" @default.
• W2116483681 title "Modeling optical and UV polarization of AGNs. I. Imprints of individual scattering regions" @default.
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