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We study the shadow produced by a class of rotating black holes surrounded byplasma. The metric for these black holes arises by applying the Newman-Janisalgorithm to a family of spherically symmetric spacetimes, which includesseveral well known geometries as special cases. We derive a general expressionfor the shape of the shadow in the case that the plasma frequency leads to aseparable Hamilton-Jacobi equation for light. We present two examples in whichwe obtain the shadow contours and the observables resulting from them. In one,we analyze Kerr-Newman-like geometries, including braneworld and Horndeskigravity black holes, while in the other, we consider scalar-tensor 4DEinstein-Gauss-Bonnet gravity spacetimes. In both cases, we find that thepresence of plasma leads to a smaller and less deformed shadow.

Shadow of axisymmetric, stationary and asymptotically flat black holes in the presence of plasma