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		| Paper: | 
		At the Edge of the X-ray Universe: Results from the Deepest Extragalactic Surveys | 
	 
	
		| Volume: | 
		380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys | 
	 
	
		| Page: | 
		103 | 
	 
	
		| Authors: | 
		Brandt, W.N. | 
	 
	
	
		| Abstract: | 
		I briefly review some recent results from the deepest surveys of the cosmic X-ray background with the Chandra and XMM-Newton missions, focusing on studies of active galactic nuclei (AGNs). Topics covered include (1) the challenges and results of source follow-up, (2) X-ray absorption in deep-field AGNs, (3) the number-density and spectral evolution of AGNs, (4) AGN selection completeness, and (5) the X-ray AGN content of distant infrared and submillimeter galaxies. I also describe some outstanding problems and prospects for current and future X-ray missions. | 
	 
	
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