Does the AGN Unified Model Evolve With Redshift? Utilizing the X-ray Background to Predict the Mid-Infrared

Details Does the AGN Unified Model Evolve With Redshift? Utilizing the X-ray Background to Predict the Mid-Infrared Does the AGN Unified Model Evolve With Redshift? Utilizing the X-ray Background to Predict the Mid-Infrared

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.2708b&link_type=abstract

American Astronomical Society Meeting 208, #27.08; Bulletin of the American Astronomical Society, Vol. 38, p.107

Astronomy and Astrophysics

Astronomy

Scientific paper

Deep X-ray surveys have resolved much of the extragalactic X-ray background (XRB) into point sources, the vast majority of which are obscured AGN. Optical followup observations of these objects have shown intriguing evidence that the covering factor of absorbing material around the AGN (as determined by the ratio of Type 2/Type 1 sources) changes with redshift. If so, then the absorbing material must be connected to processes within the host galaxy. Here, we use the results of XRB synthesis calculations as input to detailed Cloudy simulations in order to predict the evolution of AGN properties at several mid-IR wavelengths. We find that the mid-IR luminosity functions of AGN will be an excellent tool to measure the evolution of the covering factor of the gas and dust around the AGN. In addition, fitting our models to existing data clearly indicates that the inner radius of the absorbing gas and dust around an average AGN lies at distances of 10 pc from the central engine, rather than the more traditional value of 1 pc.

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