Separability of rotational effects on a gravitational lens
Jan, 2003Citations per year
Abstract: (arXiv)
We derive the deflection angle up to due to a Kerr gravitational lens with mass and specific angular momentum . It is known that at the linear order in and the Kerr lens is observationally equivalent to the Schwarzschild one because of the invariance under the global translation of the center of the lens mass. We show, however, nonlinear couplings break the degeneracy so that the rotational effect becomes in principle separable for multiple images of a single source. Furthermore, it is distinguishable also for each image of an extended source and/or a point source in orbital motion. In practice, the correction at becomes for the supermassive black hole in our galactic center. Hence, these nonlinear gravitational lensing effects are too small to detect by near-future observations.- 98.62.Sb
- 04.70.Bw
- 95.30.Sf
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