MBH mass as a function of galaxy mass for redshifts z = 4, 2, 1 and 0.25 as circles for all MBHs contained within 2 effective radii of their host galaxy. For the lowest redshift, z = 0.25, big circles (dark red) highlight the most massive MBH for a given galaxy, while the small circles (dark red) show all the secondary MBHs within the galaxy. The black line denotes the mean MBH for all primary BH within a given MS bin at z = 0.25 for NEWHORIZON. Also shown are observations of MBH vs. stellar mass for z ∼ 0 − 0.3 from Reines & Volonteri (2015; RV15; green triangles), Greene et al. (2020; Greene20; blue markers) and Baron & Ménard (2019; BM19; grey contours). The error bars in RV15 were omitted for clarity. On average, central MBHs in NEWHORIZON grow significantly only above a stellar mass threshold of a few 109 M⊙, with non-central MBHs generally failing to grow even in galaxies above this mass threshold.
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