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Due to the finite amount of observational data, the best-fit parameterscorresponding to the reconstructed cluster mass have uncertainties. In turn,these uncertainties affect the inferences made from these mass models.Following our earlier work, we have studied the effect of such uncertainties onthe singularity maps in simulated and actual galaxy clusters. The mass modelsfor both simulated and real clusters have been constructed using grale. Thefinal best-fit mass models created using grale give the simplest singularitymaps and a lower limit on the number of point singularities that a lens has tooffer. The simple nature of these singularity maps also puts a lower limit onthe number of three image (tangential and radial) arcs that a cluster lens has.Hence, we estimate the number of galaxy sources giving rise to the three imagearcs, which can be observed with the James Webb Space Telescope (JWST). We findthat we expect to observe at least 20-30 tangential and 5-10 radial three-imagearcs in the Hubble Frontier Fields cluster lenses with the JWST.

Exotic Image Formation in Strong Gravitational Lensing by Clusters of Galaxies -- II: Uncertainties