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Last updated on April 17, 2014 at 21:23 EDT
Average AGN X-ray Spectrum
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Average AGN X-ray Spectrum

January 25, 2013
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. Copyright: MPE