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The peculiar QSO J0927+2943 shows multiple sets of emission lines in itsoptical spectrum. This signature has been interpreted as the relative motionbetween a black hole, either recoiling or bound in a binary system, and itshost galaxy, or as a superposition of two galaxies along the line of sight. Inorder to test these scenarios, we have collected 2mm CO(2-1) observations usingthe IRAM Plateau de Bure Interferometer, and optical images and spectroscopy atthe Calar Alto observatory. Together with archival HST images, these dataprovide unique insights on the nature of this system. The recoiling/binaryblack hole scenarios are ruled out by the clear detection of a galactic-scalemolecular gas reservoir at the same redshift of the QSO broad lines. Theobservations presented here also disfavour the superposition model, althoughwith less constraints. Thus, the origin of the second, bright set of narrowemission lines in J0927+2943 is still unknown.

New insights on the recoiling/binary black hole candidate J0927+2943 via molecular gas observations