Beware the Non-uniqueness of Einstein Rings
Prasenjit Saha, Liliya L. R. Williams
Abstract
We explain how an approximation to the rings formed by the host galaxies in lensed QSOs can be inferred from the QSO data alone. A simple ring image can be made from any lens model by a simple piece of computer graphics: just plot a contour map of the arrival-time surface with closely-spaced contours. We go on to explain that rings should be (a) sensitive to time-delay ratios between different pairs of images, but (b) very insensitive to H0. We illustrate this for the well-known quads 1115+080 and 1608+656.
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