Are we surprised to find SMBHs with JWST at z > 9?

Understand

JWST is unveiling for the first time accreting black holes (BHs) with masses of 10^6 - 10^7 Msun at z > 4, with the most distant residing in GNz11 at z = 10.6.

• Are we really surprised to find them in the nuclei of z = 5 - 11 galaxies? Here we predict the properties of 4 < z < 11 BHs and their host galaxies considering an Eddington-limited (EL) and a super-Eddington (SE) BH accretion scenario, using the Cosmic Archaeology Tool (CAT) semi-analytical model.
• We calculate the transmitted spectral energy distribution of CAT synthetic candidates, representative of the BH/galaxy properties of GNz11.
• We also examine the possibility that the z = 8.7 galaxy CEERS-1019 could host an active BH.