Lobban, AP and Vaughan, S and Pounds, K and Reeves, JN (2018) X-ray time lags in PG 1211+143. Monthly Notices of the Royal Astronomical Society. 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
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: 08 Feb 2018 09:31
URI: http://eprints.keele.ac.uk/id/eprint/4432

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