2025/12/28 by Xin Qin, Fen Long, Qin, Xin +5
Physics and Astronomy · #Astrophysical Phenomena and Observations #Pulsars and Gravitational Waves Research #Astrophysics and Cosmic Phenomena
paper · pdf · doi:10.1088/1674-1137/ae740c
Abstract We investigate the polarized images of an equatorial emitting ring around a Konoplya-Zhidenko rotating non-Kerr black hole, which introduces an additional deformation parameter. The deformation parameter η allows the spin parameter to extend beyond the bounds imposed by the standard Kerr black hole. The results indicate that the polarized images depend not only on the magnetic field configuration, fluid velocity, and observer inclination angle, but also on the deformation parameter and the spin parameter. As the deformation parameter increases, the polarization intensity decreases monotonically. However, the magnitude of the Electric Vector Position Angle (EVPA) increases with η. Furthermore, we note that the parameter η may induce subtle yet discernible azimuthal separation features, which could potentially distinguish it from the spin parameter and the magnetic field orientation angle. Nevertheless, these features are difficult to resolve under current observational conditions and await verification by future high-resolution facilities such as the next-generation Event Horizon Telescope (ngEHT).