Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-18
Mon.Not.Roy.Astron.Soc. 365 (2006) 813-826
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS; 16 pages, 13 figures
Scientific paper
10.1111/j.1365-2966.2005.09748.x
We study linear polarization due to scattering of light on a cloudlet of particles, taking into account the radiation drag and the gravitational pull exerted on them by a central body. Effects of special and general relativity are included by connecting a model of Beloborodov (1998) for the local polarization of scattered light with Abramowicz, Ellis & Lanza (1990) formalism for the particle motion near an ultra-compact star. Compactness of the central body and its luminosity are two critical parameters of the model. We discuss the polarization magnitude of photons, which are Thomson-scattered into direct and higher-order images. Importance of the latter is only moderate under typical conditions, but they may give rise to distinct features, which we explore in terms of a toy model. The scattered signal exhibits variations of intensity and of polarization with mutual time-lags depending on the beaming/focusing effects and the light travel time.
Horak Jiri
Karas Vladimir
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