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X-ray reverberation lags of the Fe–K line due to AGN disc winds

Mizumoto, Misaki; Ebisawa, Ken; Tsujimoto, Masahiro; Done, Chris; Hagino, Kouichi; Odaka, Hirokazu

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Authors

Ken Ebisawa

Masahiro Tsujimoto

Kouichi Hagino

Hirokazu Odaka



Abstract

Short X-ray reverberation lags are seen across a broad Fe–K energy band in more than 20 active galactic nuclei (AGNs). This broad iron line feature in the lag spectrum is most significant in super-Eddington sources such as Ark 564 (L/LEdd ∼ 1) and 1H 0707–495 (L/LEdd ≳ 10). The observed lag time-scales correspond to very short distances of several Rg/c, so that they have been used to argue for extremely small ‘lamp-post’ coronae close to the event horizon of rapidly spinning black holes. Here, we show for the first time that these Fe–K short lags are more likely to arise from scattering in a highly ionized wind, launched at ∼50Rg⁠, rotating and outflowing with a typical velocity of 0.2c. We show that this model can simultaneously fit the time-averaged energy spectra and the short-time-scale lag–energy spectra of both 1H 0707–495 and Ark 564. The Fe–K line in 1H 0707–495 has a strong P-Cygni-like profile, which requires that the wind solid angle is large and that our line of sight intercepts the wind. By contrast, the lack of an absorption line in the energy spectrum of Ark 564 requires rather face-on geometry, while the weaker broad Fe–K emission in the energy and lag–energy spectra argue for a smaller solid angle of the wind. This is consistent with theoretical predictions that the winds get stronger when the sources are more super-Eddington, supporting the idea of AGN feedback via radiation-pressure-driven winds.

Citation

Mizumoto, M., Ebisawa, K., Tsujimoto, M., Done, C., Hagino, K., & Odaka, H. (2019). X-ray reverberation lags of the Fe–K line due to AGN disc winds. Monthly Notices of the Royal Astronomical Society, 482(4), 5316-5326. https://doi.org/10.1093/mnras/sty3056

Journal Article Type Article
Acceptance Date Nov 6, 2018
Online Publication Date Nov 12, 2018
Publication Date Feb 1, 2019
Deposit Date Nov 9, 2018
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 482
Issue 4
Pages 5316-5326
DOI https://doi.org/10.1093/mnras/sty3056

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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