CO Linewidths and the Black Hole - Bulge Relationship for High Redshift QSOs

Abstract

Supermassive black holes in galactic nuclei have masses M_BH related to the mass and velocity dispersion σ_* of the host galaxy. We examine the M_BH - σ_* in high redshift QSOs, deriving M_BH from the broad emission-line widths and σ_* from the radio CO lines. At redshifts z = 4 to 6, gigantic black holes appear to exist in relatively modest galaxies.