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Narrow Iron Kα Lines in Active Galactic Nuclei: Evolving Populations?
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Narrow Iron Kα Lines in Active Galactic Nuclei: Evolving Populations?
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We assemble a sample consisting of 66 active galactic nuclei (AGNs) from literature and the {\em XMM-Newton} archive in order to investigate the origin of the 6.4 keV narrow iron K$\alpha$ line (NIKAL). The X-ray Baldwin effect of the NIKAL is confirmed in this sample. We find the equivalent width ($EW$) of the NIKAL is more strongly inversely correlated with Eddington ratio ($\ce$) than the 2-10 keV X-ray luminosity. Our sample favors the origin from the dusty torus and the X-ray Baldwin effect is caused by the changing opening angle of the dusty torus. The relation $EW-\ce$ can be derived from a toy model of the dusty torus. If the unification scheme is valid in all AGNs, we can derive the Baldwin effect from the fraction of type {\sc ii} AGNs to the total population given by {\em Chandra} and {\em Hubble} deep surveys. Thus the evolution of populations could be reflected by the NIKAL's Baldwin effect.
Forward citations
Cited by 1 Pith paper
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Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-Line Region
Gas density in the broad-line region is proposed as the primary driver of the MgII Baldwin effect, with lower densities producing steeper (more negative) slopes.
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