The Black Hole Mass - Galaxy Bulge Relationship for QSOs in the SDSS DR3

Abstract

We investigate the relationship between black hole mass, M_BH, and host galaxy velocity dispersion, σ_*, for QSOs in Data Release 3 of the Sloan Digital Sky Survey. For redshifts z < 0.5, our results agree with the M_BH - σ_* relationship for nearby galaxies. For 0.5 < z < 1.19, the measured σ_{O III} and σ_{O II} are narrower on average than what we expect from the M_BH - σ_* relationship by ∼ 0.13 dex. Pending analysis of selection effects, we consider this an upper limit for evolution of the M_BH - σ_* relationship between redshift z ≃ 1 and the present. Within this limit, this suggests either that black holes and bulges grow concurrently or that both black holes and bulges have completed their growth by redshift z ≈ 1. This material will be presented in more detail in Salviander et al. (2006).