AGN polarization modeling with STOKES

Details AGN polarization modeling with STOKES AGN polarization modeling with STOKES

2007-01-07

arxiv.org/abs/astro-ph/0701165v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, conference proceedings of the Symposium 238 at the IAU General Assembly held in August 2006 in Prague. Eds.

Scientific paper

10.1017/S1743921307005522

We introduce a new, publicly available Monte Carlo radiative transfer code, STOKES, which has been developed to model polarization induced by scattering off free electrons and dust grains. It can be used in a wide range of astrophysical applications. Here, we apply it to model the polarization produced by the equatorial obscuring and scattering tori assumed to exist in active galactic nuclei (AGNs). We present optical/UV modeling of dusty tori with a curved inner shape and for two different dust types: one composition reproduces extinction properties of our Galaxy, and the other is derived from composite quasar spectra. The polarization spectra enable us to clearly distinguish between the two dust compositions. The STOKES code and its documentation can be freely downloaded from http://www.stokes-program.info/.

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