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We present an analysis of observations with the Atacama Large(sub-)Millimetre Array (ALMA) of the 380 GHz water emission line and CO (11-10)emission line from MG J0414+0534, a gravitationally lensed dusty star-forminggalaxy that hosts a type 1 quasar. We also present observations at 1.6 GHz withglobal very long baseline interferometry (VLBI) of the radio source. We confirmthe previously reported detection of the 380 GHz water line and that the fluxdensity ratio between the two merging lensed images is reversed with respect tothe radio/mm continuum. We further find tentative evidence of variability inthe integrated line intensity on timescales of days. We show that the 380 GHzwater line has two components of emission: a disc that is around 35 pc indiameter around the quasar, and another component of emission that is offset$\sim$600 pc perpendicular to the disc that lies close to the lensing caustic.With lens modelling of the multi-wavelength data sets, we construct a model forthe quasar system consisting of a circumnuclear disc of molecular gas with asize of about 60 pc bisected by radio jets extending to a distance of about 200pc from the radio core. Our findings suggest that observations with ALMA ofhigh-excitation molecular lines from strongly lensed quasars could allowdetailed studies of AGN accretion and feedback at the cosmic peak of black holeand galaxy growth.

Smoke on the water: CO and H2O in a circumnuclear disc around a quasar at redshift 2.64