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Lobban, AP, Vaughan, S, Pounds, K and Reeves, JN (2018) X-ray time lags in PG 1211+143. Monthly Notices of the Royal Astronomical Society, 476 (1). pp. 225-234. ISSN 0035-8711
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Abstract
We investigate the X-ray time lags of a recent ∼630 ks XMM-Newton observation of PG 1211+143. We find well-correlated variations across the XMM-Newton EPIC bandpass, with the first detection of a hard lag in this source with a mean time delay of up to ∼3 ks at the lowest frequencies. We find that the energy-dependence of the low-frequency hard lag scales approximately linearly with log(E) when averaged over all orbits, consistent with the propagating fluctuations model. However, we find that the low-frequency lag behaviour becomes more complex on timescales longer than a single orbit, suggestive of additional modes of variability. We also detect a high-frequency soft lag at ∼10−4 Hz with the magnitude of the delay peaking at ≲ 0.8 ks, consistent with previous observations, which we discuss in terms of small-scale reverberation.
Item Type: | Article |
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Additional Information: | 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. |
Uncontrolled Keywords: | accretion, accretion discs, galaxies, active galaxies, individual, PG 1211+143, Seyfert, X-rays |
Subjects: | Q Science > QB Astronomy > QB460 Astrophysics |
Divisions: | Faculty of Natural Sciences > School of Physical and Geographical Sciences |
Depositing User: | Symplectic |
Date Deposited: | 08 Feb 2018 09:27 |
Last Modified: | 06 Nov 2018 09:45 |
URI: | https://eprints.keele.ac.uk/id/eprint/4432 |