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Fig. 10.

image

Projected density of 364 galaxies (40 with zspec) at 3.42 ≤ z ≤ 3.57. The contours show 1, 2, 3, 4σ level of the overdensity. Left panel: field observed in GOODS-South ALMA. Right panel: zoom-in of the extended structure in the bottom right corner of GOODS-ALMA field that encompasses 126(18) galaxies over 15 arcmin2. The red star indicates the position of AGS24. The red circle indicates a 50″radius region (2 arcmin2) including 26(3) galaxies. The yellow stars refer to the HST-galaxies AGS 11, 15 and 17 located also in this larger structure. The green circles represent the AGS 1 and 5, which are also in this redshift range but not optically dark. The white circles show the 40 galaxies with spectroscopic redshifts. We note that the two white circles falling on the red star of AGS24 are two galaxies dissociated from AGS24. The magenta square denotes the center of the proto-cluster CCPC-z34-002 identified by Franck & McGaugh (2016). The cyan square denotes Candels5001, which used to be the most massive galaxy at 3 <  z < 4 in this field (Ginolfi et al. 2017). The 50″scale in the figure is equivalent to a proper distance of 0.37 Mpc at z = 3.5.

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