Average AGN X-ray Spectrum
Date: 22 February 2005
Depicts: Average X-ray spectrum of AGN in the X-ray background
The light of about 100 distant active galaxies was first corrected to the rest frame of our Milky Way and then added together. Then a simple spectral model without lines was subtracted. The residual spectrum shows a strong, relativistically broadened iron line, which must originate from matter in the immediate vicinity of the black holes.
Last Update: 1 September 2019