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We present observations and analysis of an unusual [C II] emission line in the very luminous quasi-stellar object (QSO) SDSS J155426.16+193703.0 at z ∼ 4.6. The line is extremely broad (full width at half-maximum 735 km s−1) and seems to have a flat-topped or double-peaked line profile. A velocity map of the line shows a gradient across the source that indicates large-scale rotation of star-formin...

ALMA detection of a disc-dominated [C ii] emission line at z=4.6 in the luminous QSO J1554+1937