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We present ALMA observations of the mid-J 12CO emission from six single-dishselected 870-micron sources in the Extended Chandra Deep Field-South (ECDFS)and UKIDSS Ultra-Deep Survey (UDS) fields. These six single-dish submillimetresources were selected based on previous ALMA continuum observations, whichshowed that each comprised a blend of emission from two or more individualsubmillimetre galaxies (SMGs), separated on 5--10 arcsec scales. The sixsingle-dish submillimetre sources targeted correspond to a total of 14individual SMGs, of which seven have previously-measured robustoptical/near-infrared spectroscopic redshifts, which were used to tune our ALMAobservations. We detect CO(3-2) or CO(4-3) at z=2.3--3.7 in seven of the 14SMGs, and in addition serendipitously detect line emission from three gas-richcompanion galaxies, as well as identify four new 3.3-mm selected continuumsources in the six fields. Joint analysis of our CO spectroscopy and existingdata suggests that 64 \pm 18% of the SMGs in blended submillimetre sources areunlikely to be physically associated. However, three of the SMG fields (50%)contain new, serendipitously-detected CO-emitting (but submillimetre-faint)sources at similar redshifts to the 870-micron selected SMGs we targeted. Thesedata suggest that the SMGs inhabit overdense regions, but that these are notsufficiently overdense on ~100 kpc scales to influence the source blendinggiven the short lifetimes of SMGs. We find that 21 \pm 12% of SMGs havespatially-distinct and kinematically-close companion galaxies (~8--150 kpc and<~300 km/s), which may have enhanced their star-formation via gravitationalinteractions.

An ALMA survey of CO in submillimetre galaxies: companions, triggering, and the environment in blended sources