Prague Synergy 2013: Abstract

Andrea MerloniA. Bongiorno; the COSMOS Survey team

Evolution of AGN and SMBH growth

How did supermassive black holes form and grow in the nuclei of galaxies? Why are their physical properties today so tightly linked to those of their hosts? What was the impact on the surrounding structures of the copious energy release, either in radiative or mechanical form, associated to the growth of such black holes in active galactic nuclei (AGN)? I will show how constraints available from a multi-wavelength AGN surveys on the growth of the supermassive black holes can be used to give at least partial answers to some of these questions. Using the rich multi-band photometry in the COSMOS field we explore the host galaxy properties of a large, complete, sample of X-ray and spectroscopically selected AGN. Based on a two-components fit to their Spectral Energy Distribution, we derive rest-frame magnitudes, colors, stellar masses and star formation rates up to z~3, and we study the connection between these host galaxy properties, accretion luminosity and obscuration in galactic nuclei across more than 2/3 of the age of the Universe. Although AGN activity and star formation appear to have a common triggering mechanism, we do not find any 'smoking gun' signaling the influence of luminous AGN on the global properties of their host galaxies.