Characterizing the AGN populating the NuSTAR Extragalactic Survey fields

I will present a spectroscopic analysis of a sample of 63 AGN detected in the NuSTAR Extragalactic Survey fields and selected to have bright fluxes in the 8-24 keV energy range. I will report on their properties measured through a broad-band joint NuSTAR+Chandra/XMM spectral analysis. In particular I will discuss on the derived observed/intrinsic column density distribution, Compton Thick and absorption fractions comparing them with Cosmic X-ray Background population synthesis model predictions.