LBQS0109: a) white contours show the ALMA 3 mm continuum emission in correspondence of LBQS0109 at an angular resolution of 0.64′′×0.53′′. Contours correspond to − 2, 2, 3, 4 and 5 times the noise per beam (12 μJy). The colour background image shows the continuum emission in H band from SINFONI observations. The blue arrow indicates the direction of the ionised outflow revealed by the kinematic analysis of the broad [Oiii]λ5007 line (Carniani et al. 2015a). b) CO(3−2) spectrum extracted from an aperture as large as the synthesised beam size of the ALMA observations and re-binned to 120 km s^-1. The vertical green solid and dotted lines mark the expected CO(3−2) central wavelength based on the redshift of the narrow Hα and [Oiii]λ5007 component, respectively (Carniani et al. 2016). The dashed red curve shows the best fit Gaussian profile. c) CO(3−2) surface brightness map. Black solid contours are at the levels of 2σ, 3σ, 4σ and 5σ of the CO(3−2) flux map, where σ is 0.03 Jy/beam km s^-1. The 2σ negative contours are indicated by the black dashed curves. The synthesised beam is shown in the bottom-left corner of the map.