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        Polarization due to dichroic absorption and emission by aligned grains in dusty discs

        Author
        Efstathiou, A.
        McCall, A.
        Hough, J.
        Attention
        2299/3258
        Abstract
        We present a method for calculating the infrared polarization due to absorption and emission by aligned grains distributed in a disc or a torus. The temperature distribution in the torus is calculated with the axially symmetric radiative transfer code of Efstathiou & Rowan-Robinson. The polarization patterns predicted for a torus that is believed to be typical of those found in active galactic nuclei (AGN) show a characteristic flip in position angle, as the polarization changes from dichroic absorption to dichroic emission. The wavelength at which the flip occurs is very sensitive to the optical thickness of the torus but not to the fraction of aligned grains, their elongation or any other parameter we have explored. We also find that the predicted polarization is not sensitive to whether grain alignment extends into the hot (inner) part of the disc (T>250K) or not.
        Publication date
        1997
        Published in
        Monthly Notices of the Royal Astronomical Society
        Other links
        http://hdl.handle.net/2299/3258
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