Fig. 10

Lyα halo scale length plotted as a function of rest-frame FWHM of the Lyα line. The purple dots correspond to the objects that have a high significant Lyα halo (p0 ≤ 0.05). Most of the objects without a significant Lyα halo (p0> 0.05, see Sect. 5.1, red circles) or with upper limits on their halo properties (green triangles for scale lengths, black crosses for halo fluxes – see Sect. 4.3.2) show a Lyα line narrower than 350 km s-1 (black dashed line).
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