The Black Hole - Bulge Relationship for QSOs at High Redshift

Indicators of Black Hole Mass and Eddington Accretion Ratio from Qso X-ray and Uv Spectra

The evolution of luminous QSOs is linked to the evolution of massive galaxies. We know this because the relic black-holes found locally have masses dependent on the properties of the host galaxy’s bulge. An important way to explore this evolution would be to measure dependences of black hole masses and Eddington accretion ratios over a range of redshifts, i.e., with cosmological age. For low re...

The Fundamental Plane of Quasars

We present results from an archival study of 70 medium-redshift QSOs observed with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The QSOs have magnitudes MV ≤ −23 (total nuclear plus host light) and redshifts 0.06 ≤ z ≤ 0.46. A close relationship between QSO host and nucleus is found by examining multiple parameters at once. A principal components analysis shows that 3 ...

Joint Formation of QSOs and Spheroids: QSOs as clocks of star formation in Spheroids

Direct and indirect observational evidence leads to the conclusion that high redshift QSOs did shine in the core of early type galaxies during their main episode of star formation. In a previous paper we showed that the evolution of the luminosity function of QSOs can be accounted for within the framework of the analytical hierarchical model for dark matter haloes in the line of the extended Pr...

The Fundamental Plane of QSOs and the Relationship Between Host and Nucleus

We present results from an archival study of 70 medium-redshift QSOs observed with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The QSOs have magnitudes MV ≤ −23 (total nuclear plus host light) and redshifts 0.06 ≤ z ≤ 0.46. The aim of the present study is to investigate the connections between the nuclear and host properties of QSOs, using high-resolution images and r...

2 Black Hole Demographics : High Redshift QSOs