The Iron Line Background

Abstract

We investigate the presence of iron line emission among faint X-ray sources identified in the 1Ms Chandra Deep Field South and in the 2Ms Chandra Deep Field North. Individual source spectra are stacked in seven redshift bins over the range z=0.5-4. We find that iron line emission is an ubiquitous property of X-ray sources up to z~3. The measured line strengths are in good agreement with those expected by simple pre-Chandra estimates based on X-ray background synthesis models. The average rest frame equivalent width of the iron line does not show significant changes with redshift.

5 pages, 2 figures, ApJ Letters in press (include emulateapj.sty)

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• The X-ray spectral properties of the AGN population in the XMM-Newton bright serendipitous survey
• Searching for the 3.5 keV Line in the Deep Fields with Chandra: the 10 Ms observations
• A selection effect boosting the contribution from rapidly spinning black holes to the Cosmic X-ray Background
• Average Fe K-alpha emission from distant AGN
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• Rest-frame stacking of 2XMM catalog sources : Properties of the Fe Kalpha line
• Averaging the AGN X-ray spectra from deep Chandra fields
• The XMM deep survey in the CDFS XI. X-ray properties of 185 bright sources
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• Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra
• Relativistic accretion disk reflection in AGN X-ray spectra at z=0.5--4: a study of four \textit{Chandra} deep fields
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• On the equivalent width of the Fe K$\alpha$ line produced by a dusty absorber in active galactic nuclei
• Extragalactic Surveys: AGN physics and evolution
• The Integrated Relativistic Iron Line from Active Galactic Nuclei: Chasing the Spin Evolution of Supermassive Black Holes
• Relativistic Iron lines at high redshifts
• Strong gravity effects: X-ray spectra, variability and polarimetry