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We recently discovered that the luminous radio-quiet QSO LBQS0302-0019 atz=3.286 is likely accompanied by an obscured AGN at 20kpc projected distance,which we dubbed Jil. It represents the tightest candidate obscured/unobscureddual AGN system at z>3. To verify the dual AGN scenario we obtained deep $K_s$band (rest-frame $V$ band) imaging with the VLT/HAWK-I+GRAAL instrument at 0.4"resolution during science verification in January 2018. Indeed, we detect theindividual host galaxies of the QSO and Jil with estimated stellar masses of$\log(M_\star/M_{\odot})=11.4\pm0.5$ and $\log(M_\star/M_{\odot})=10.9\pm0.5$,respectively. Near-IR spectra obtained with VLT-KMOS reveal a clear [OIII]$\lambda$5007 line detection at the location of Jil which does not contributesignificantly to the $K_s$ band flux. Both observations therefore corroboratethe dual AGN scenario. A comparison to Illustris cosmological simulationssuggests a parent halo mass of $\log(M_\mathrm{halo}/M_{\odot})=13.2\pm0.5$ forthis interacting galaxy system, corresponding to a very massive dark matterhalo at that epoch.

A cosmic dance at z~3: Detecting the host galaxies of the dual AGN system LBQS0302-0019 and Jil with HAWK-I+GRAAL