LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method
S. Wallington, C. S. Kochanek, R. Narayan
Abstract
We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is b=09820, the dimensionless shear is γ=0.0771, and the position angle of the shear is θ=1008. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.
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