Dynamics of thin accretion disks and accretion around a charged-PFDM black hole

TL;DR

This study explores how a magnetically charged black hole in a dark matter environment affects accretion disk dynamics, radiation, and accretion rates, with implications for observational signatures and black hole properties.

Contribution

It provides a detailed analysis of accretion processes around a charged-PFDM black hole, constrained by EHT shadow observations, highlighting the influence of black hole parameters on disk and accretion characteristics.

Findings

Charged-PFDM black holes have higher overall luminosity than Schwarzschild black holes.

Black hole parameters significantly affect the effective potential and particle dynamics in the accretion disk.

Local radiative flux and temperature are lower compared to Schwarzschild black holes.

Abstract

This paper investigates the dynamical behavior of steady spherical accretion onto a static, magnetically charged black hole embedded in a perfect fluid dark matter (PFDM) background. Using the shadow observations of M87* from the Event Horizon Telescope (EHT), we establish constraints on the parameter space for the magnetic charge and the PFDM parameter. Within this constrained range, we analyze the orbital dynamics of particles in a thin accretion disk surrounding the black hole and find that the black hole parameters significantly influence the effective potential, angular velocity, specific energy, and specific angular momentum of the particles. Subsequently, we calculate the radiative energy flux, temperature profile, and observed spectrum of the disk. Our results show that, while the local radiative flux and temperature at a given radius are lower for the charged-PFDM black hole compared to a Schwarzschild black hole, its overall radiative efficiency and total luminosity are higher. Finally, we explore the spherically symmetric, steady-state accretion process around the black hole, revealing how the parameters govern how the fluid velocity, density profile, and black hole mass accretion rate are influenced.