Extreme gravitational lensing by supermassive black holes

Details Extreme gravitational lensing by supermassive black holes Extreme gravitational lensing by supermassive black holes

2007-10-30

arxiv.org/abs/0710.5607v1

Nuovo Cim.B122:547-556,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 2 figures, review talk at Italian-Pakistan Workshop on Relativistic Astrophysics, 20-22 June 2008, Lecce (Italy)

Scientific paper

10.1393/ncb/i2007-10378-6

Extreme gravitational lensing refers to the bending of photon trajectories that pass very close to supermassive black holes and that cannot be described in the conventional weak deflection limit. A complete analytical description of the whole expected phenomenology has been achieved in the recent years using the strong deflection limit. These progresses and possible directions for new investigations are reviewed in this paper at a basic level. We also discuss the requirements for future facilities aimed at detecting higher order gravitational lensing images generated by the supermassive black hole in the Galactic center.

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