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Fig. 8.

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Depletion time (left) and gas fraction (right) as a function of offset from the main sequence (ΔMS) as parameterised by Speagle et al. (2014) for our QSOs (magenta circles). The comparison samples are as indicated in Fig. 6, and we show their combined median error shown by a cross in each panel. For the QSO comparison samples, the gas mass estimates have been adjusted for αCO = 4. The vertical dashed line shows the position for sources on the main–sequence, Δ = 0. Our CO–detected QSOs follow the overall trend shown by the comparison samples of decreasing (increasing) depletion time (gas fraction) with increasing ΔMS. B1608+656 and B1600+434 are outliers in this plot, as they have lower tdep by about an order of magnitude than other star–forming galaxies and QSOs of similar ΔMS, further supporting the idea that they are transitioning into quiescence.

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