Left: velocity map of the Lyα emission feature. The color code highlights the velocity along the line of sight in each spaxel of the image, the zero-point being set at z = 3.0887 or λvac = 4970.5 Å. The curves are the isophotes labeled in units of 10-20 erg s-1 cm-2 spaxel-1. Below 6 × 10-19 erg s-1 cm-2 spaxel-1, the S/N is very low and everything outside this isophote is strongly affected by background noise. The green point near the center shows the position of the QSO. The dashed rectangle represents the region of the image used in Fig. 9; we have enhanced it by lowering the contrast in the area that surrounds it. Right: map of the FWHMs of the Lyα emission feature. The FWHM in each spaxel is computed from the Gaussian fit of the emission spectrum. For comparison, the average FWHM measured from the total emission spectrum is 560 km s-1.
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