Image of the Schwarzschild black hole pierced by a cosmic string with a thin accretion disk

TL;DR

This paper investigates how a cosmic string piercing a Schwarzschild black hole affects the appearance of a surrounding thin accretion disk, including image shape, size, redshift, and flux distributions, using a semi-analytic approach.

Contribution

It introduces a semi-analytic method to analyze the optical appearance of accretion disks around black holes with cosmic strings, highlighting the impact of the cosmic string parameter on observable features.

Findings

Cosmic string parameter s alters disk image shape and size.

Redshift and flux distributions depend on observer inclination and cosmic string parameter.

The method provides detailed visual and flux distributions for different parameters.

Abstract

We study the optical appearance of a thin accretion disk around a Schwarzschild black hole pierced by a cosmic string with a semi-analytic method of Luminet [11]. Direct and secondary images with different parameters observed by a distant observer is plotted. The cosmic string parameter s can modify the shape and size of the thin disk image. We calculate and plot the distribution of both redshift and observed flux as seen by distant observers at different inclination angles. Those distributions are dependent on the inclination angel of the observer and cosmic parameter s.