Schematic view (to scale) of the outflow structure around a QSO at z = 6. Regions b, c, and d are as in Fig. 1. The host halo mass was fixed to 3 × 1011M⊙. As Rayleigh-Taylor instabilities develop, the gas shell loses fragments (clouds) of the size of its thickness. Depending on when a cloud detaches from the shell, it will be seen as an outflowing or inflowing cloud, where “younger” clouds have larger distances from the QSO and higher receding velocities. The length of each arrow is proportional to the cloud velocity. The dashed curve at ~ 50 kpc shows the boundary where clouds are seen as infalling or outflowing. Clouds that have detached from the shell at tacc< 186 Myr have already fallen back to the BH by the time the system is observed (t9), and still, they may accumulate and produce large reservoirs of cold gas around the QSO.
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