Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-04-05
Physics
High Energy Physics
High Energy Physics - Theory
V2: 28 pages, 15 figures, major modification, references added
Scientific paper
In this paper, we study numerically the quasi-equatorial lensing by the stationary, axially-symmetric Kerr-Taub-NUT black hole in the strong field limit. The deflection angle of light ray and other strong deflection limit coefficients are obtained numerically and they are found to be closely dependent on the NUT charge $n$. We also compute the magnification and the positions of the relativistic images. The caustics are studied and the results show that these caustics drift away from the optical axis, which is very different from the Schwarzschild black hole case. Moreover, the intersections of the critical curves on the equatorial plane are obtained and it is shown that they increase with the NUT charge $n$. These results are also compared to the Kerr black hole case.
Fu Chun-E
Liu Yu-Xiao
Wei Shao-Wen
Yang Ke
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