James Webb Space Telescope Feed Post

UNCOVER | UNCOVERing the extended strong lensing structures of Abell 2744 with the deepest JWST imaging

A 34" × 34" cutout of an UNCOVER color-composite image. We mark identified SL features around the northern sub-structure of A2744. The northern BCG, which is left free to vary in our SL model, is shown in red. We also show the critical curves of our SL model for source redshifts Zs = 1 in yellow, Zs = 1.6881 in blue and Zs = 10 in purple. The critical curves from the current model do not pass where we would expect for system 78, suggesting that the system either lies at a lower redshift (Zs < 1), that it consists only of two images, or most probably, that the mass of this sub-halo is somewhat overestimated. A red spiral galaxy south of the N-BCG is notably lensed, i.e. magnified and distorted, but is likely not multiply imaged