The Iron line background

Marcella Brusa (MPE)

We have performed X--ray spectral analysis of all the spectroscopically identified sources detected in the Chandra Deep Field North and Chandra Deep Field South observations. A total of ~250 spectra were stacked in 5 different redshift bins over the range z=0.5-1.7. A single absorbed power law model does not provide an acceptable description of the data and significant residuals are always present at the expected position of Fe K_alpha line at 6.4 keV in all the redshift bins.

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