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The Carnegie Observatories

Contributing to basic research in astronomy since 1904, as a part of the Carnegie Institution of Washington

Connecting Galaxy Evolution, Star Formation and the X-ray Background

Connecting Galaxy Evolution, Star Formation and the X-ray Background


 

David Ballantyne (U of Arizona)

As a result of deep hard X-ray observations by Chandra and XMM, a significant fraction of the cosmic X-ray background has been resolved into individual sources. Optical followup observations find that these objects are mostly obscured Type 2 AGN, have Seyfert-like X-ray luminosities, and peak in redshift at z~0.7. Since this redshift is similar to the peak in the cosmic star-formation rate, it possible that the obscuring material required for AGN unification is regulated by star-formation within the host galaxy, and therefore connected to the overall growth of the galaxy. In this talk, I show how observations at both X-ray and mid-IR wavelengths can constrain models of AGN evolution and unification, leading us to a greater understanding of the intertwined processes of galaxy evolution, black hole growth and star formation.