Topology of magnetic field and polarization in accretion discs of AGN

被引：4

作者：

Gnedin, Y. N. ^{[1
]}

Buliga, S. D. ^{[1
]}

Silant'ev, N. A. ^{[1
]}

Natsvlishvili, T. M. ^{[1
]}

Piotrovich, M. Y. ^{[1
]}

机构：

[1] Cent Astron Observ Pulkovo, St Petersburg, Russia

来源：

ASTROPHYSICS AND SPACE SCIENCE | 2012年 / 342卷 / 01期

关键词：

AGN; Polarization; Magnetic field; Accretion; X-RAY; DISKS; INSTABILITY; DEPENDENCE; TURBULENCE; SPIN;

D O I：

10.1007/s10509-012-1146-y

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we demonstrate that the wavelength dependence of polarization degree and position angle allows us to derive the distribution of magnetic field in accretion disc. The polarized radiation arises due to scattering of emission light by electrons in a magnetized optically thick accretion disc. Faraday rotation of polarization plane is taken into consideration. Through wavelength dependence of polarization it is possible to derive the value of the magnetic Prandtl number in the accretion disc plasma. The power law index of the polarization wavelength dependence is related with the radial distribution of magnetic field in an accretion disc. This allows us to test the various models of an accretion disc around the central black hole.

引用

页码：137 / 145

页数：9

共 33 条

[1] A POWERFUL LOCAL SHEAR INSTABILITY IN WEAKLY MAGNETIZED DISKS .1. LINEAR-ANALYSIS [J].