Fig. 2.

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Suggested constraints on radial number density profile, n•(r), of the stellar-mass black hole cluster as a function of radial distance, r, from the Sgr A⋆ supermassive black hole are plotted together with an arbitrary distribution function (solid ‘bumpy’ black line) fulfilling these constraints. The vertical dotted red lines mark the boundaries between regions I, II, and III in which the impact of the black holes is qualitatively different. The horizontal dashed lines mark the density of the black holes for which O and B stars would be ground down in 5 Myr. The observational constraints based on the GRAVITY Collaboration (2024) enclosed mass limits and on a subsample of the hypercompact radio sources from Zhao et al. (2022) are depicted by the x-shaped points with arrows at the corresponding distances from Sgr A⋆. The purpose of the dotted grey lines is to guide the eye of the reader to the particular density values.
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