Polarization Due to Scattering in a Clumpy Cloud and Active Galactic Nuclei

Details Polarization Due to Scattering in a Clumpy Cloud and Active Galactic Nuclei Polarization Due to Scattering in a Clumpy Cloud and Active Galactic Nuclei

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...468..606k&link_type=abstract

Astrophysical Journal v.468, p.606

Astronomy and Astrophysics

Astronomy

9

Galaxies: Active, Ism: Clouds, Polarization, Radiative Transfer, Scattering

Scientific paper

Polarization caused by electron scattering in a clumpy cloud that consists of many blobs illuminated by an external radiation is investigated through a Monte Carlo approach. We found that polarization properties are characterized by the optical thickness of each blob and that of the whole cloud. If each blob is rather optically thick, the polarization degree for a clumpy cloud is considerably lower than expected for the uniform cloud with the same optical thickness because of the multiple scattering in such a clumpy cloud. This result is applied to the scattering cloud in active galactic nuclei (AGNs). The absence of highly polarized Seyfert 2 galaxies has been a problem for the "unified" scheme of AGNs. The possibility of explaining this problem by considering clumpy structure is briefly discussed.

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