Hotspot Image Driven by Magnetic Reconnection in Kerr-anti-de Sitter Black Holes

TL;DR

This paper models the plasma hotspot images near Kerr-AdS black holes influenced by magnetic reconnection, revealing how the cosmological constant affects hotspot size and dynamics.

Contribution

It introduces a novel hotspot imaging model based on the Comisso-Asenjo mechanism in Kerr-AdS black holes, incorporating the effects of the cosmological constant.

Findings

Three flares observed within the imaging timeframe.

Hotspot size increases with the absolute value of the cosmological constant.

Magnetic reconnection drives the hotspot evolution.

Abstract

Based on the Comisso-Asenjo mechanism, we investigate the kinematic images of plasma before and after magnetic reconnection in Kerr-Anti-de Sitter(Kerr-AdS) black holes. Following a brief review of the Comisso-Asenjo process in Kerr-AdS black holes, we introduce the hotspot model and the imaging method. Building upon these foundational theories, we obtain the trajectory of the plasma and the temporal evolution of the hotspot images. It is found that there are three flares within the observing time, which is driven by the Comisso-Asenjo mechanism. We also discuss the influence of the cosmological parameter on the hotspot imaging. The results indicate that the hotspot image enlarges as the absolute value of $\Lambda$ increases, demonstrating that the cosmological constant significantly affects the hotspot.