Comptonization of lowfrequency radiation in accretion disks Angular distribution and polarization of hard radiation
Abstract
In accretion disks the angular distribution and polarization of hard radiation forming via Comptonization, i.e., multiple scatterings in the disk, depend only on the optical thickness of the disk and are independent of either the photon frequency or the geometric distribution of lowfrequency photons. This paper presents calculations of the angular distribution and polarization made for several values of the optical thickness of disks, for the case of the Thomson scattering. The method of successive approximations over the number of scatterings was employed in the calculations, without taking into account the frequency dependence of the scattering crosssection and indicatrix. Specific astrophysical applications of the results obtained are discussed. A simplified theory of electron temperature dependence on the vertical coordinate in the disk is given. The density distribution over the vertical coordinate in the radiationdominated disks is derived.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 February 1985
 Bibcode:
 1985A&A...143..374S
 Keywords:

 Accretion Disks;
 Angular Distribution;
 Compton Effect;
 Polarization (Waves);
 Polarized Electromagnetic Radiation;
 X Ray Sources;
 Cygnus Constellation;
 Electron Energy;
 Optical Thickness;
 Photon Density;
 PhotonElectron Interaction;
 Scattering Cross Sections;
 X Ray Spectra;
 Astrophysics