Our cosmological initial conditions are based on the simulation Phi-4096 of ref. 51. In this work, a dark-matter-only N-body simulation was performed in a comoving box of side length 16 h−1 Mpc. The initial condition is generated by MUSIC52 at a redshift of 127. The cosmological parameters used follow the latest measurement by Planck53: Ωm = 0.31, ΩΛ = 0.69, Ωb = 0.048, h = 0.68,
Observations and data reduction MoM-BH*-1 has been observed with JWST by three programmes. It was imaged in cycle 1 by the PRIMER survey14 (JWST-GO-1837; principal investigator: J. Dunlop) using the MIRI (5 January 2023 and 16 January 2023) and NIRCam (7 August 2023 and 9 August 2023) instruments. In cycle 2 (19 December 2023), the
