http://arxiv.org/abs/2205.11330
A simple, novice-friendly scheme for classifying the image configurations of quadruply lensed quasars is proposed. With only six classes, it is intentionally coarse-grained. Readers are invited to test drive the scheme on a sample of 12 quadruply lensed quasar systems. The taxonomy is effectively 2+1 dimensional in that the angular configuration of the images couples only weakly to the non-circularity of the configuration. The scheme can be extended to systems for which the lensing galaxy is observed, at the price of an added dimension.
P. Schechter
Tue, 24 May 22
52/92
Comments: Submitted to AJ; 6 pages, 3 figures of which Figure 1 is the centerpiece
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