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Dual-Active Galactic Nuclei (AGN) are a natural consequence of thehierarchical structure formation scenario, and can provide an important test ofvarious models for black hole growth. However, due to their rarity anddifficulty to find at high redshift, very few confirmed dual-AGN are known atthe epoch where galaxy formation peaks. Here we report the discovery of agravitationally lensed dual-AGN system at redshift 2.37 comprising twooptical/IR quasars separated by 6.5+/-0.6 kpc, and a third compact (R_eff =0.45+/-0.02 kpc) red galaxy that is offset from one of the quasars by 1.7+/-0.1kpc. From Very Large Array imaging at 3 GHz, we detect 600 and 340 pc-scaleradio emission that is associated with both quasars. The 1.4 GHz luminositydensities of the radio sources are about 10^24.35 W / Hz, which is consistentwith weak jets. However, the low brightness temperature of the emission is alsoconsistent with star-formation at the level of 850 to 1150 M_sun / yr. Althoughthis supports the scenario where the AGN and/or star-formation is beingtriggered through an ongoing triple-merger, a post-merger scenario where twoblack holes are recoiling is also possible, given that neither has a detectedhost galaxy.

PS J1721+8842: A gravitationally lensed dual AGN system at redshift 2.37 with two radio components