The formation of supermassive black holes from Population III.1 seeds. II. Evolution to the local universe

Abstract

We present predictions for cosmic evolution of populations of supermassive black holes (SMBHs) forming from Population III.1 seeds, i.e., early, metal-free dark matter minihalos forming far from other sources, parameterized by isolation distance, $d_{\mathrm{iso}}$. Extending previous work that explored this scenario to $z=10$, we follow evolution of a $(60\mathrm{Mpc}{)}^3$ volume to $z=0$. We focus on evolution of SMBH comoving number densities, halo occupation fractions, angular clustering and 3D clustering, exploring a range of $d_{\mathrm{iso}}$ constrained by observed local number densities of SMBHs. We also compute synthetic projected observational fields, in particular a case comparable to the Hubble Ultra Deep Field. We compare Pop III.1 seeding to a simple halo mass threshold model, commonly adopted in cosmological simulations of galaxy formation. Major predictions of the Pop III.1 model include that all SMBHs form by $z\sim 25$, after which their comoving number densities are near-constant, with low merger rates. Occupation fractions evolve to concentrate SMBHs in the most massive halos by $z=0$, but with rare cases in halos down to $\sim 10^8{M}_{\odot }$. The $d_{\mathrm{iso}}$ scale at epoch of formation, e.g., $100$kpc-proper at $z\sim 30$, i.e., $\sim 3$Mpc-comoving, is imprinted in the SMBH two-point angular correlation function, remaining discernible as a low-amplitude feature to $z\sim 1$. The SMBH 3D two-point correlation function at $z=0$ also shows lower amplitude compared to equivalently massive halos. We discuss prospects for testing these predictions with observational surveys of SMBH populations.

arXiv comment15 pages, 15 figures, 2 tables. Accepted for publication in MNRAS

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