The Black Hole–Bulge Relationship for QSOs at High Redshift

2005/12/15 by G. A. Shields, K. L. Menezes, C. A. Massart +2 · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #astro-ph

paper · pdf · doi:10.1086/500542

published as Astrophys.J.641:683-688,2006 · 16 pages, 4 EPS figures, accepted for publication in The Astrophysical Journal

arxiv created 2005/12/15 · openalex publication_date 2006/04/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

We examine the black hole mass-galaxy bulge relationship in high-redshift QSOs. Black hole masses are derived from broad emission lines, and the host galaxy stellar velocity dispersion σ * is estimated from the widths of the radio CO emission lines. At redshifts z > 3, the CO line widths are narrower than expected for the black hole mass, indicating that these giant black holes reside in undersized bulges by an order of magnitude or more. The largest black holes ( M BH > 10 9 M ☉ ) evidently grow rapidly in the early universe without commensurate growth of their host galaxies. CO line widths offer a unique opportunity to study AGN host galaxy dynamics at high redshift.

Citations

• M BH - Relation for a Complete Sample of Soft X-Ray-selected Active Galactic Nuclei
• Black Holes in Galaxy Mergers: Evolution of Quasars
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• Molecular Gas at High Redshift
• A 3 × 10[TSUP]9[/TSUP] [ITAL]M[/ITAL][TINF]⊙[/TINF] Black Hole in the Quasar SDSS J1148+5251 at [CLC][ITAL]z[/ITAL][/CLC] = 6.41

Cited by

• Scaling Relations Between Low-mass Black Holes and Their Host Galaxies
• Growth of Black Holes and Their Host Spheroids in (Sub)mm-loud High-Redshift QSOs
• RESOLVING THE DYNAMICAL MASS OF Az∼ 1.3 QUASI-STELLAR OBJECT HOST GALAXY USING SINFONI AND LASER GUIDE STAR ASSISTED ADAPTIVE OPTICS