Galaxy and AGN Evolution in the MIR: a combined Spitzer and X-ray view
  A proper analysis of the evolution of sources emitting in the Mid-Infrared is strongly dependent on their broad-band spectral properties (SEDs) at different redshifts and luminosities and on a reliable classification allowing to disentangle AGN from star-formation activity. The diagnostic diagrams based on the optical line ratios are often ambiguous and/or misleading not allowing a proper separation of the galaxy/AGN populations. Thanks to the combination of deep Spitzer and X-rays data a much better census of the hidden AGN activity and dust-obscured star-forming galaxies can be obtained, constraining galaxy and AGN evolutionary models. 
C. Gruppioni (1), F. Pozzi (1 and 2), A. Comastri (1), C. Vignali (2)   and G. Rodighiero (3). ((1) INAF-Osservatorio Astron...