Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-15
Mon.Not.Roy.Astron.Soc. 355 (2004) 1005-1009
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS; 6 pages, 3 figures
Scientific paper
10.1111/j.1365-2966.2004.08396.x
The effects of strong gravity on the polarization of the Compton reflection from an X-ray illuminated accretion disc are studied. The gravitational field of a rotating black hole influences Stokes parameters of the radiation along the propagation to a distant observer. Assuming the lamp-post model, the degree and the angle of polarization are examined as functions of the observer's inclination angle, of the height of the primary source and of the inner radius of the disc emitting region. It is shown that polarimetry can provide essential information on the properties of black holes sources, and it is argued that time variation of the polarization angle is a strong signature of general relativity effects. The expected polarization degree and angle should be detectable by new generation polarimeters, like the one planned for the Xeus mission.
Dovciak Michael
Karas Vladimir
Matt Giorgia
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