Confirmation of a new population of cocooned AGN

Cocooned AGN are a new population of AGN selected with MIR properties indicativeof powerful quasars, but quiescent galaxylike optical spectra, includingweaktoabsent OIII emission. This is likely due to AGN youth or virgul4 picovering factor obscuring material enshrouding the AGN, but the existing minimalXray data has been insufficient to differentiate between these scenarios. Wepropose a targeted campaign of 8 of the brightest CAGN in our sample. AnXMMNewton exposure quasisimultaneously with NuSTAR is sufficient to make thisdistinction, even up to Comptonthick levels of obscuration, with parameterdegeneracies. These observations are essential to determine the emissionmechanism responsible for the CAGN and hence push towards a complete census of black hole growth \\ evolution. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]