Table of Contents
Universe, Volume 3, Issue 3 (September 2017)
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Cover Story (view full-size image) Comparison of lensing by point mass in vacuum (top) and in plasma (bottom left and bottom right). [...] Read more. Comparison of lensing by point mass in vacuum (top) and in plasma (bottom left and bottom right). The photon trajectories and deflection angles in vacuum don’t depend on the photon frequency. Therefore lensing in vacuum is achromatic, and the Schwarzschild point-mass lens leads to two images with complicated spectra, formed by the photons of different frequencies which undergo deflection by the same angle. If lens is surrounded by plasma, the light rays of different frequencies have different deflection angles. Gravitational lensing becomes chromatic in presence of plasma. The images become diffused and divide into many images formed by photons of different frequencies. Difference in angular position of images of different frequencies take place both in homogeneous and non-homogeneous plasma and is a subject for observation. For more details see review of G.S. Bisnovatyi-Kogan and O.Yu. Tsupko.