Galaxy overdensity BOSS1441 at z = 2.32 ± 0.02 (Cai et al. 2017a). The density contours (green) for LAEs are shown in steps of 0.1 galaxies per arcmin2, with the inner density peak of 1.0 per arcmin2. The density contours are shown with increasing thickness for increasing galaxy number density. The brown crosses indicate the positions of known QSOs in the redshift range 2.30 ≤ z < 2.34, and thus likely within the overdensity. We also highlight the position of the ELAN MAMMOTH-1 (dotted crosshair), and the effective area of our SCUBA-2 observations (red dashed contour).
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