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Studying the average properties of active galactic nuclei (AGN) host stellarpopulations is an important step in understanding the role of AGN in galaxyevolution and the processes which trigger and fuel AGN activity. Here wecalculate model spectral energy distributions (SEDs) that include emission fromthe AGN, the host galaxy stellar population, and dust enshrouded starformation. Using the framework of cosmic X-ray background population synthesismodeling, the model AGN hosts are constrained using optical (B band) and nearinfrared (J band, 3.6 um, 5.7 um, 8.0 um, and 24 um) luminosity functions andnumber counts. It is found that at z < 1, type 1 and type 2 AGN hosts havesimilar stellar populations, in agreement with the orientation based unifiedmodel and indicative of secular evolution. At z > 1, type 2 AGN hosts areintrinsically different from type 1 AGN hosts, suggesting that the simpleorientation based unified model does not hold at z > 1. Also, it is found thatif Compton thick (CT) AGN evolve like less obscured type 2 AGN, then, onaverage, CT AGN hosts are similar to type 2 AGN hosts; however, if CTobscuration is connected to an evolutionary stage of black hole growth, then CTAGN hosts will also be in specific evolutionary stages. Multi-wavelengthselection criteria of CT AGN are discussed.

The Young, the Old, and the Dusty: Stellar Populations of AGN Hosts