Strong deflection lensing by charged black holes in scalar-tensor gravity

Understand

We examine a class of charged black holes in scalar-tensor gravity as gravitational lenses.

• We find the deflection angle in the strong deflection limit, from which we obtain the positions and the magnifications of the relativistic images.
• We compare our results with those corresponding to the Reissner-Norstrom spacetime and we analyze the observational aspects in the case of the Galactic supermassive black hole.