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Fig. 4.

image

Lyα SB resulting from the combination of recombination emission (of all gas in the simulation) below the mirror limit and collisional excitation of gas below half the critical self-shielding density, covering an area of 20 × 20 arcmin2, or 31.0 × 31.0 h−2 cMpc2, in a narrowband with Δλobs = 8.75 Å (corresponding to ∼2.7 h−1 cMpc) in a simulation snapshot at z = 4.8. The images are made by the projection method (Sect. 2.4.1) onto a pixel grid of 6000 × 6000; this is the same pixel size as MUSE, making this image the equivalent of a mosaic of 20 × 20 MUSE pointings (more details on MUSE follow in Sect. 3.3). Regions 1 and 2, indicated by the white rectangles, will be studied in more detail later. Also shown in the bottom left corner are the scales of the MUSE FOV (1 × 1 arcmin2) and 1 h−1 cMpc.

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