Disc wind or disc line? The extraordinary Fe-K feature of Mrk 1513
Journal
Date Issued
2023
Author(s)
Middei, R.
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Matzeu, G. A.
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Bianchi, S.
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Puccetti, S.
Abstract
We discuss the origin of a very unusual spectral structure observed in the
Fe-K band of the Seyfert galaxy Mrk 1513, a local ($z$=0.063) active galactic
nucleus (AGN) that is efficiently accreting matter onto its central
supermassive black hole ($L_{\rm bol}/L_{\rm Edd}\sim$0.5). We consider the
highest quality X-ray observation of this source available to date, performed
in 2003 by XMM-Newton. The hard X-ray spectrum is characterised by a remarkable
spectral drop at $\sim$7 keV, which can be interpreted as either the onset of a
broad absorption trough or the blue wing of a relativistic emission line.
Overall, this complex feature is significant at >5$\sigma$, and it is
qualitatively reminiscent of a P-Cygni profile. A serendipitous spectrum of
lower quality taken by XMM-Newton in 2015 qualitatively confirms the presence
of similar Fe-K structures. Although it is not possible to distinguish between
the two physical scenarios on sheer statistical grounds with the current data,
several considerations lend weight to the possibility that Mrk 1513 is actually
hosting a persistent outflow at accretion-disc scales, thus adding to the
handful of known AGN in which a wide-angle X-ray wind has been identified so
far.
Volume
680
Start page
A50
Issn Identifier
0004-6361
Ads BibCode
2023A&A...680A..50M
Rights
open.access
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