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Fig. E.1.


Top: χsmth map of 57″ × 57″ (or 438 kpc × 438 kpc) FoV for 6.25 Å (5 layers) centered at the wavelength expected for the C IV line emission (6208.8 Å) given the center of the 3D mask for the Lyα emission. The map is obtained after PSF and continuum subtraction using a Gaussian kernel with FWHM = 1.66″ (i.e., similar to the seeing) as explained in Appendix C. Bottom: same as the top panel, but centered at the wavelength expected for the He II line emission (6573.5 Å). Both maps, covering the corresponding velocity range of Fig. C.1, do not reveal the presence of any clear detection of extended C IV or He II line emission associated with the extended Lyα emission. In both panels, we overlay a grid spaced by 15″ (or 115 kpc) and we indicate with circles the position of QSO1 and QSO2 prior to their PSF subtraction. In both panels, the interloper galaxy G is indicated with its contour.

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