Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-11-21
Phys.Rev.D75:023006,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
31 pages, 17 figures; V2 references added, some typos corrected, V3 references added, language corrections, V4 table added, mi
Scientific paper
10.1103/PhysRevD.75.023006
In the present work we study numerically quasi-equatorial lensing by the charged, stationary, axially-symmetric Kerr-Sen dilaton-axion black hole in the strong deflection limit. In this approximation we compute the magnification and the positions of the relativistic images. The most outstanding effect is that the Kerr-Sen black hole caustics drift away from the optical axis and shift in clockwise direction with respect to the Kerr caustics. The intersections of the critical curves on the equatorial plane as a function of the black hole angular momentum are found, and it is shown that they decrease with the increase of the parameter $Q^{2}/M$. All of the lensing quantities are compared to particular cases as Schwarzschild, Kerr and Gibbons-Maeda black holes.
Gyulchev Galin N.
Yazadjiev Stoytcho S.
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