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We study a sample of Herschel-PACS selected galaxies within the GOODS-Southand the COSMOS fields in the framework of the PACS Evolutionary Probe (PEP)project. Starting from the rich multi-wavelength photometric data-setsavailable in both fields, we perform a broad-band Spectral Energy Distribution(SED) decomposition to disentangle the possible active galactic nucleus (AGN)contribution from that related to the host galaxy. We find that 37 per cent ofthe Herschel-selected sample shows signatures of nuclear activity at the 99 percent confidence level. The probability to reveal AGN activity increases forbright ($L_{\rm 1-1000} > 10^{11} \rm L_{\odot}$) star-forming galaxies at$z>0.3$, becoming about 80 per cent for the brightest ($L_{\rm 1-1000} >10^{12} \rm L_{\odot}$) infrared (IR) galaxies at $z \geq 1$. Finally, wereconstruct the AGN bolometric luminosity function and the super-massive blackhole growth rate across cosmic time up to $z \sim 3$ from a Far-Infrared (FIR)perspective. This work shows general agreement with most of the panchromaticestimates from the literature, with the global black hole growth peaking at $z\sim 2$ and reproducing the observed local black hole mass density withconsistent values of the radiative efficiency $\epsilon_{\rm rad}$($\sim$0.07).

Tracing the cosmic growth of super massive black holes to z ~ 3 with Herschel