Fig. 2.
Continuum-subtracted spectrum of the CO(3−2) emission line in PDS 456, extracted from a circular region of 1 arcsec radius. Panel a: integrated flux density as a function of velocity, corresponding to a circular region of 1 arcsec radius centred on the QSO position. The channel width is 30 km s−1. Panel b: zoomed-in view of the high-velocity wings in the CO(3−2) line profile.
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