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The co-evolution of host galaxies and the active black holes which reside intheir centre is one of the most important topics in modern observationalcosmology. Here we present a study of the properties of obscured ActiveGalactic Nuclei (AGN) detected in the CDFS 1Ms observation and their hostgalaxies. We limited the analysis to the MUSIC area, for which deep K-bandobservations obtained with ISAAC@VLT are available, ensuring accurateidentifications of the counterparts of the X-ray sources as well as reliabledetermination of photometric redshifts and galaxy parameters, such as stellarmasses and star formation rates. In particular, we: 1) refined theX-ray/infrared/optical association of 179 sources in the MUSIC area detected inthe Chandra observation; 2) studied the host galaxies observed and rest framecolors and properties. We found that X-ray selected (L_X>10^{42} erg s^{-1})AGN show Spitzer colors consistent with both AGN and starburst dominatedinfrared continuum; the latter would not have been selected as AGN frominfrared diagnostics. The host galaxies of X-ray selected obscured AGN are allmassive (M_*>10^{10} M_sun) and, in 50% of the cases, are also actively formingstars (1/SSFR<t_{Hubble}) in dusty environments. The median L/LEdd value of theactive nucleus is between 2% and 10% depending on the assumed M_{BH}/M_{*}ratio. Finally, we found that the X-ray selected AGN fraction increases withthe stellar mass up to a value of ~30% at z>1 and M_*>3x10^{11} M_sun, afraction significantly higher than in the local Universe for AGN of similarluminosities.

Black hole growth and starburst activity at z = 0.6-4 in the Chandra Deep Field South. Host galaxies properties of obscured AGN