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Fig. 2.


Sample of six LAEs surrounded by a Lyα halo with S/N >  10 from the L17 sample. Each row shows a different object. First column: HST/F606W image of the LAE. The HST coordinates (Rafelski et al. 2015) are indicated by the black cross in all panels. The MUSE ID and z are indicated. Second column: Lyα narrowband image (plotted with a power-law stretch) with SB contour at 10−18 erg s−1 cm−2 arcsec−2 (dashed white). The solid white contour shows the outer limit of the Voronoi bins group (S/N >  4) used in this study (see Sect. 3.1). Third column: map of the Lyα line peak velocity shift relative to the central () Lyα line peak (see Sect. 3.3). The diverging colormaps are centered on the parameter values of the central line and have the same dynamical range to ease the visual comparison. The FWHM of the PSF is plotted in the upper-left corner. Fourth column: map of the Lyα line FWHM. Fifth column: lines extracted in the ellipsoid areas designated by the same line style on the maps. They aim to highlight the spectral variations in the core and halo components. The dotted and dashed colored horizontal lines show the 1σ error and the dashed black line shows the zero.

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