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AGN polarization modeling with Stokes

Published online by Cambridge University Press:  01 August 2006

René W. Goosmann ,
C. Martin Gaskell  and
Masatoshi Shoji
René W. Goosmann
Affiliation:
Astronomical Institute, Academy of Sciences, Prague, Czech Republic, emial: goosmann@astro.cas.cz
C. Martin Gaskell
Affiliation:
Dept. Physics & Astronomy, Univ. of Nebraska, Lincoln, NE, USA, mgaskell1@unl.edu
Masatoshi Shoji
Affiliation:
Astronomy Dept., University of Texas, Austin, TX, USA, masa1127@astro.as.utexas.edu
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Abstract

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We introduce a new, publicly available Monte Carlo radiative transfer code, Stokes, which has been developed to model polarization induced by scattering of 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. 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/.

Keywords

Polarization – radiative transfer – dustextinction – galaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 375 - 376
Copyright
Copyright © International Astronomical Union 2007

References

Antonucci, R. 2002, Astrophysical Spectropolarimetry, 151 (astro-ph/0103048)Google Scholar
Gaskell, C. M., Goosmann, R. W., Antonucci, R. R. J. & Whysong, D. H. 2004, ApJ, 616, 147CrossRefGoogle Scholar
Goosmann, R. W. & Gaskell, C. M. 2007, A&A, 465, 129Google Scholar
Shoji, M., Gaskell, C. M. & Goosmann, R. W. 2005, Bulletin of the AAS, 37, 1420Google Scholar