Relativistic rings due to Schwarzschild gravitational lensing

O.Yu. Tsupko1 and G.S. Bisnovatyi-Kogan2

Abstract

Strong gravitational lensing in the Schwarzschild metric is considered in the case when the source, a point lens, and the observer are situated on a straight line. Angular sizes and magnification factors are calculated for relativistic rings formed by the photons which undergo one or several turns around the black hole.

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