Possible Evolution of Supermassive Black Holes from FRI quasars

TL;DR

This paper proposes a new low-probability pathway for rapid supermassive black hole growth in the early universe, linking FRI quasars' properties to black hole evolution without super Eddington accretion.

Contribution

It introduces a novel growth channel for supermassive black holes that connects FRI quasars' characteristics to early universe black hole formation.

Findings

Identifies a low-probability growth channel for billion-solar-mass black holes.

Links FRI quasars to massive black hole growth and their observational scarcity.

Constructs high-redshift AGN luminosity function consistent with recent data.

Abstract

We explore the question of the rapid buildup of black hole mass in the early universe employing a growing black hole mass-based determination of both jet and disk powers predicted in recent theoretical work on black hole accretion and jet formation. Despite simplified, even artificial assumptions about accretion and mergers, we identify an interesting low probability channel for the growth of one billion solar mass black holes within hundreds of millions of years of the Big Bang without appealing to super Eddington accretion. This result is made more compelling by the recognition of a connection between this channel and an end product involving active galaxies with FRI radio morphology but weaker jet powers in mildly sub-Eddington accretion regimes. While FRI quasars have already been shown to occupy a small region of the available parameter space for black hole feedback in the paradigm, we further suggest that the observational dearth of FRI quasars is also related to their connection to the most massive black hole growth due to both these FRIs high redshifts and relative weakness. Our results also allow us to construct the AGN luminosity function at high redshift, that agree with recent studies. In short, we produce a connection between the unexplained paucity of a given family of active galactic nuclei and the rapid growth of supermassive black holes, two heretofore seemingly unrelated aspects of the physics of active galactic nuclei.