Exotic Image Formation in Strong Gravitational Lensing by Clusters of
  Galaxies -- II: Uncertainties
  Due to the finite amount of observational data, the best-fit parameters
corresponding 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 on
the singularity maps in simulated and actual galaxy clusters. The mass models
for both simulated and real clusters have been constructed using grale. The
final best-fit mass models created using grale give the simplest singularity
maps and a lower limit on the number of point singularities that a lens has to
offer. The simple nature of these singularity maps also puts a lower limit on
the 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 image
arcs, which can be observed with the James Webb Space Telescope (JWST). We find
that we expect to observe at least 20-30 tangential and 5-10 radial three-image
arcs in the Hubble Frontier Fields cluster lenses with the JWST.
