Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf...93l&link_type=abstract
CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
We compute the polarization of the broad Lyα emission line, which is Rayleigh-scattered from high column neutral components including the broad emission line region itself and the accretion disk in active galactic nuclei. Depending on the anisotropy of the radiation field in the broad emission line region and relative geometry with respect to the accretion disk, a large range of degree of polarization up to 10 percent is obtained. It is argued that the accretion disk reflection, which gives the polarization perpendicular to the disk normal axis, dominantly contributes to the polarized broad Lyα flux. We estimate the polarized flux Rayleigh-scattered in the broad emission line region that is modeled by a large number of spherical clouds distributed mainly in the equatorial region, and find that only minor contribution to the total polarized flux is obtained. Our results are applied to the polarized Lyα of the radio quiet quasar PG 1630+377.
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