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Narrow Iron K$alpha$ Lines in Active Galactic Nuclei: Evolving Populations? | Xin-Lin Zhou & Jian-Min Wang
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3 Dec 2004 | Journal: | Astrophys.J. 618 (2004) L83-L86 | Subject: | astro-ph | Affiliation: | IHEP, Beijing) & Jian-Min Wang (IHEP, Beijing | Abstract: | 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. | Source: | arXiv, astro-ph/0412075 | Services: | Forum | Review | PDF | Favorites |
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