Polarization from an orbiting spot

Details Polarization from an orbiting spot Polarization from an orbiting spot

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..359d&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Computer Science

Scientific paper

The polarization from a spot orbiting around Schwarzschild and extreme Kerr black holes is studied. We assume different models of local polarization. Firstly, as a toy model we set local polarization vector either normal to the disc plane, or we assume strictly azimuthal direction. Then we examine more realistic situation with a spot arising due to the emission from the primary source above the disc. We employ either Rayleigh single scattering or Compton multiple scattering approximations. Overall flux, degree and angle of polarization integrated over the whole orbit as well as their time dependence during the spot revolution are examined as functions of the observer's inclination angle. The gravitational and Doppler shifts, lensing effect as well as time delays are taken into account.

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