James Webb Space Telescope Feed Post

Harvard ADS: Supermassive primordial black holes for the GHZ9 and UHZ1 observed by the JWST

Paper abstract: The high redshift (z>10) galaxies GHZ9 and UHZ1 observed by the James Webb Space Telescope (JWST) are very massive and have exceptionally high black hole-to-star mass ratios with the central black hole masses M\gtrsim 10^7\rm~M_\odot. In this paper, we explore the possibility that they are seeded by the supermassive primordial black holes (SMPBHs), which came into being in the very early universe, with initial masses ~ 10^7\rm~M_\odot. We present the self-similar accretion solutions for SMPBHs, and find that the mass growth of SMPBHs during pregalactic era may be negligible. These SMPBHs, when the redshift z<~ 20, can accelerate seeding high-redshift galaxies and their baryonic content, and consequently explain the central supermassive black holes (SMBHs) of high-redshift massive galaxies through sub-Eddington accretion. According to our results, SMPBHs actually could lead to the existence of more massive SMBHs at higher redshifts compared to other SMBH seed scenarios, specially SMBHs with masses M\gtrsim 10^7~\rm M_\odot at z>20 might only origin from SMPBHs, thus the corresponding observation can serve as a potential probe to PBHs.