# Radiation intensity and polarization from accretion discs with progressive increasing height

## TL;DR

This paper models radiation intensity and polarization from optically thick, conical accretion discs with increasing height, explaining observed polarization behaviors in Seyfert galaxies.

## Contribution

It introduces a new model of polarized radiation from conical accretion discs with increasing height, explaining opposite polarization angles in spectral line wings.

## Key findings

- Polarization in conical discs is less than in flat discs.
- Polarization angles are opposite on different parts of the ring.
- The model explains opposite polarization in spectral line wings.

## Abstract

The article considers the optically thick accretion discs with the progressive increasing height. The surface is assumed to be the conical form. The radiation with considered wavelength emerges from an ring on the cone and is described by the Milne problem for the intensity and polarization. The inclination angles of the rings are taken 15 and 30 grad. The inclination angles between the line of sight and the normal to the central accretion disc plane are taken 30, 45, 60 grad for every value of the ring inclination. For the continuum radiation the polarization of the emerging light is less than that in the case of the plane accretion disc. The polarization position angles of radiation emerging from the right and left parts of the ring are opposite one another. They are determined by the geometry of the problem. The position angle of the observed continuum radiation is parallel to the central plane of the accretion disc. Our theory gives the new explanation of that the position angles in "red" and "blue" wings of a spectral line are opposite one another. This behavior exists in many Seyfert galaxies.