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,
Details of observations Our observations, from which we inferred S301, comprise 19 datasets spanning more than 8 years. We first noted S301 in 2023, when pointing directly to Sgr A*. Given the position of the star close to Sgr A* and its large proper motion, it was clear that it might be on a tight orbit,
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
Data The HST Advanced Camera for Surveys (ACS) images use the Wide Field Channel (WFC) in the F555W and F814W filters, have an angular resolution of 0.1″ and reach exposure times of 2,406 s and 2,439 s, respectively. The observations were carried out in September 2022 under HST programme ID 16890 (ref. 52) and the resulting images of
