Searching for extended Lyα emission in groups within the MXDF field. The images are composites of low and mid-frequencies IUWT wavelets S/N components. The solid contours display the segmentation corresponding to the identified structures (named filament in the text). LAE group members and potential low-z interlopers are shown, respectively, as red and white symbols. The group number, its corresponding redshift and the diffuse emission P-value (P) (see Sect. 4.4) are labeled. The P-value is written in red for groups with confidence 1. The blue circle symbol in group 6 indicates the location of the AGN ID 788 in the Chandra catalog (Luo et al. 2017). The MXDF field shown here corresponds to a depth of 16+ h. It has a diameter of 80″ or 2.5 cMpc at z = 3.
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