Sustained super-Eddington accretion in high-redshift quasars

Understand

Observations of $z \gtrsim 6$ quasars provide information on the early evolution of the most massive black holes (MBHs) and galaxies.

• Current observations, able to trace both gas and stellar properties, reveal a population of MBHs that is significantly more massive than expected from the local MBH-stellar mass relation.
• The population lies on, but mostly above, the relation observed in the nearby Universe.
• This suggests that these objects grew very rapidly.