Oral Presentation

Investigating the cosmic evolution of the black hole mass - bulge luminosity relation

Daeseong Park (NAOC)

We investigate the cosmic evolution of the black hole mass – bulge luminosity relation using a sample of 52 active galaxies at z ∼ 0.36 and z ∼ 0.57, corresponding to look-back times of 4 and 6 Gyrs. By employing multi-component spectral and structural decomposition methods to the high-quality Keck spectra and high-resolution HST images, black hole masses are estimated from the Hβ broad emission line with the 5100Å nuclear luminosity, and bulge luminosities are derived from the surface photometry. Using Monte Carlo simulations to take into account selection effects, we find the positive evolutionary trend, which is consistent with that BH growth precedes that of the host galaxies. This indicates that black holes grow first and then their host galaxies follow up in the framework of the co-evolution of black holes and galaxies.