Observational signature of near-extremal Kerr-like black holes in a modified gravity theory at the Event Horizon Telescope

Understand

We study the shadows cast by near-extremal Kerr-MOG black holes for different values of the parameter in modified gravity (MOG).

• In particular, we consider an isotropic emitter orbiting near such black holes and analytically compute the positions, fluxes and redshift factors of their images.
• The size of the shadow decreases when the modified parameter is increased.
• For each shadow, the images of the emitter appear on a special part of the shadow which has a rich structure.