NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T17:48:38 PDT
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For refcode 2006MNRAS.368L..62N:
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NED Abstract

Copyright by Royal Astronomical Society. 2006MNRAS.368L..62N On the origin of the iron K{alpha} line cores in active galactic nuclei Nandra, K. Abstract. X-ray observations made with Chandra and XMM-Newton have shown that there are relatively narrow cores to the iron K{alpha} emission lines in active galactic nuclei (AGN). Plausible origins for this core emission include the outer regions of an accretion disc, a parsec-scale molecular torus, and the optical broad-line region (BLR). Using data from the literature it is shown that no correlation exists between the Fe K{alpha} core width and the BLR (specifically H{beta}) line width. This shows that in general the iron K{alpha} core emission does not arise from the BLR. There is a similar lack of correlation between the width of the Fe K{alpha} core and black hole mass. The average K{alpha} width is about a factor of 2 lower than the H{beta} width. It therefore seems likely that, in many cases, the narrow core arises in the torus. There is a very wide range of observed Fe K{alpha} core widths, however, and this argues for multiple origins. The simplest explanation for the observed line profiles in AGN is that they are due to a mixing of very narrow emission from the inner edge of the torus, and broadened emission from the accretion disc, in varying proportions from object to object.
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