A Comparative Study of Shadows of Magnetized and Non-Magnetized Singularities

TL;DR

This paper compares the shadows of magnetized and non-magnetized singularities using Ernst technique, aiming to improve understanding of black hole shadows like those observed in M87 and Sagittarius A*.

Contribution

It introduces a method to analyze black hole shadows considering magnetic fields, enhancing realism over previous approximations.

Findings

Magnetic fields significantly alter the shadow shape.

Comparison of effective potentials reveals differences due to magnetization.

Results aid in interpreting astrophysical black hole images.

Abstract

The recent observations of the galactic center of the M87 galaxy have made the field of observing black holes and calculating its shadow much more intriguing. Approaching the question of calculating shadows, many approximations are made in order to simplify the equations which makes the considered case less realistic. Understanding the shadow of different singularities under the influence of magnetic field is of more importance astrophysically as the accreting matter around the singularity would generate electromagnetic fields as it would be in plasma state due to the high tidal effects. Here, we use Ernst technique to immerse spacetimes in uniform, sourceless and asymptotic magnetic field. Later, we compare the effective potential of null geodesics in magnetized and non-magnetized cases. This study would be helpful in understanding the M87 shadow and the forthcoming image of shadow of SagA*.