Effects of plasma on the shadow of black holes obtained through the Newman-Janis algorithm (presentación oral, coautor)

JAVIER BADÍA; ERNESTO F. EIROA

Córdoba

Conferencia; CosmoSur VI; 2022

Observatorio Astronómico de Córdoba

Since the announcement of the first image of a supermassive black hole obtained by the Event Horizon Telescope, the study of shadows has received an increasing interest. Recently, much attention has been paid to the shadows of various classes of rotating black hole geometries obtainable from their static counterparts through the Newman-Janis algorithm. We extend these calculations to the case where the black hole is surrounded by a plasma environment. We find that the Hamilton-Jacobi equation for the motion of light rays is separable if the plasma frequency obeys a certain mathematical condition, and we present the shadow contours and the related observables for example spacetimes.