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We present an analysis of archival observations with the Atacama Large(sub-)Millimetre Array (ALMA) of the gravitationally lensed quasar MGJ0414+0534, which show four compact images of the quasar and an Einstein ringfrom the dust associated with the quasar host galaxy. We confirm that theflux-ratio anomalies observed in the mid-infrared and radio persists into thesub-mm for the continuum images of the quasar. We report the detection of CO(11-10) spectral line emission, which traces a region of compact gas around thequasar nucleus. This line emission also shows evidence of a flux-ratio anomalybetween the merging lensed images that is consistent with those observed atother wavelengths, suggesting high-excitation CO can also provide a usefulprobe of substructures that is unaffected by microlensing or dust extinction.However, we do not detect the candidate dusty dwarf galaxy that was previouslyreported with this dataset, which we conclude is due to a noise artefact. Thus,the cause of the flux-ratio anomaly between the merging lensed images is stillunknown. The composite compact and diffuse emission in this system suggestlensed quasar-starbursts will make excellent targets for detecting darksub-haloes and testing models for dark matter.

A flux-ratio anomaly in the CO spectral line emission from gravitationally-lensed quasar MG J0414+0534