Data from paper: Caught in Swallowtails: Discovery of Two Swallowtail Image Formations in MS 0451.6-0305

We report the discovery of two swallowtail image formations at z=2.91 and z=6.70 behind the galaxy cluster MS 0451.6-0305 in JWST-NIRCam imaging. We find that in both of the above lensed systems, the complex image morphology cannot be reproduced by simple fold/cusp caustics, and detailed lens modeling reveals higher-order swallowtail caustic configurations. In the z=2.91 lens system, a small part of the source galaxy (which itself is part of a galaxy group) containing atleast two compact knots sits inside the swallowtail caustic, producing a quadruply imaged arc. At two of the image positions of these knots, we infer point source magnifications of > 300, implying lensing-corrected effective radii of < 0.8-1.5 pc. The z=6.70 system exhibits even more complex image formation. We therefore only use the most confidently identified counter-images of knots in this system as constraints in our lens modeling. The resulting model predicts magnifications in 20-200 range and lensing-corrected effective radii of <~ 0.8-18.5 pc for various knots. Together, these two systems represent the first example of observations of multiple swallowtail image formations in a single galaxy cluster and demonstrate the ability of swallowtail caustics to magnify individual substructures at sub-parsec scales, from intermediate redshifts to the first billion years of the Universe.