Perturbative and numerical approach to plasma strong lensing

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{Using two different approaches, we study imaging in the strong lens regime taking into account the effects of plasmatic environments on light propagation.

• First, we extend the use of a perturbative approach that allows us to quickly and analytically calculate the position and shape of the images of a circular source lensed by a galaxy.
• Such approach will be compared with that obtained from the numerical solution of the lens equations.
• Secondly, we introduce a 3-dimensional spheroidal model to describe the spacetime associated with the dark matter halo around the lens galaxy and an associated optical metric to incorporate the presence of the plasma medium.