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Fig. 1

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The three combined and sky-subtracted FORS2 spectra along with their spatial deconvolution. The spatial resolution after deconvolution is 0.25′′. In each panel, the vertical arrow indicates the position of the Lyα emission line of the quasar, the wavelength of which is indicated. The horizontal double arrow is 50 Å wide. A Lyα envelope is detected in all three quasars. The envelope of SDSS J14472 + 0401 is blueshifted from that of the quasar, while that of SDSS J21474−0838 and that of BR 2237−0607 are redshifted. The height of the spectra is 16′′ in all panels.

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