Eur. Phys. J. C (2014) 74: 3171
https://doi.org/10.1140/epjc/s10052-014-3171-1

Regular Article - Theoretical Physics

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

¹ Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Casilla de Correo 67, Sucursal 28, 1428, Buenos Aires, Argentina
² Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón I, 1428, Buenos Aires, Argentina

^* e-mail: eiroa@iafe.uba.ar

Received: 1 October 2014
Accepted: 3 November 2014
Published online: 26 November 2014

Abstract

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–Norström spacetime and we analyze the observational aspects in the case of the Galactic supermassive black hole.