Year: 2025
Type: article
Abstract: We examine the red-shift emission from special orbits ( horizons replicas ) where photons have the same angular velocity, in magnitude, as those of the Kerr black hole ( BH ) Killing horizons. We focus on two particular contexts of special significance for their observational implications. A set of these orbits is located in the BH photons shell. Therefore the analysis also connects the red-shifting or blue-shifting from replicas (defined through the BH light surfaces) to the BH shadow boundaries. We then concentrate on the equatorial, general relativistic, axially symmetric accretion disks, orbiting around the central attractor. In the analysis we adopted in particular the Polish doughnut models of geometrically thick toroids, to investigate the signals frequency-shifting from the horizons replica as related to the disks surface, inner edge and accretion flows. The findings map the red-shifting and blue-shifting regions of the signals in dependence to the photons impact parameter, view-angle, angular velocity of the emitter and BH spin. Co-rotating and counter-rotating replica could be identified through the red-shifting or blue-shifting of the emitted signals from the mapped regions.
Source: The European Physical Journal C
Authors: D. Pugliese, Z. Stuchlík
Institution: Silesian University in Opava
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4414378557