a false postive
by Budgieye moderator
"Well done - you correctly ignored the false positive in this field:
The shape of this blue arc looks too straight for it to be a lensed image (straight arcs are mostly produced by very massive galaxy clusters/groups). If the pair of blue compact sources were lensed images of a background quasar they would be on diametrically opposite sides of the lensing galaxy. Images of lensed QSOs could appear in these poisitons if a third image was present to the north, but this is not seen."
I posted this so I could think about it later