Shadows and observational appearance of a new family of Ayón-Beato-García black holes

Abstract

In this paper, we study the shadows and observational appearance of the Ayón-Beato-García (ABG) black hole, which is surrounded by a thin disk accretion. For a four-dimensional ABG black hole, as the charge q increases, the event horizon $r_+$, radius $r_{p}$ and impact parameter $b_p$ of the photon sphere decrease, while the maximum value of effective potential $V_{eff}$ increases. However, as the term $\gamma$ associated with nonlinear electrodynamics increases, the related physical quantities $r_+$, $r_p$ and $b_p$ increase, but the maximum value of $V_{eff}$ decreases. When the light ray reaches the vicinity of the ABG black hole, one can observe the trajectories of the light rays appear as three types, i.e., direct emission, lens ring and photon ring. Furthermore, the shadows and the observational appearance of the ABG black hole are studied. The results show that the charge $q$ and the term $\gamma$ have a great influence on the shape and intensity of the black hole shadow. When the relevant state parameters change or the emission model changes, it can be argued that it is the direct emission that plays a decisive role in the total observed intensity of the ABG black hole, while the contribution of the lens ring to the total observed intensity is small and the photon ring makes almost no contribution.

Observational appearances of hairy black holes in the framework of gravitational decoupling

“…The visible shapes of the brightest black holes accompanied by an accretion disk were comparable with the EHT observations for M87 * and SgrA * [17,18]. In recent years, research on black hole shadows has extended to black holes in Born-Infeld electromagnetic fields [19,20], the Ayón-Beato-García black hole family [21] and black holes with multiple photon spheres [22][23][24][25]. Moreover, Euler-Heisenberg black holes [26], black holes immersed in quintessence dark energy [27], brane-world black holes [28] and others have also been studied [29][30][31][32][33].…”