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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1307.6371 (astro-ph)
[Submitted on 24 Jul 2013]

Title:The flux-dependent X-ray time lags in NGC 4051

Authors:W. N. Alston, S. Vaughan, P. Uttley
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Abstract:We present an analysis of the X-ray time lags for the highly variable Seyfert 1 galaxy NGC 4051, based on a series of XMM-Newton observations taken in 2009. We investigate the Fourier frequency dependent time lags in the light curves between the 0.3--1.0 keV and 2.0--5.0 keV energy bands as a function of source flux, including simultaneous modelling of the resulting lag-frequency spectra. We find the shape of the lag-frequency spectra to vary significantly and systematically with source flux. We model the lag-frequency spectra using simple transfer functions, and find that two time lag components are required, one in each energy band. The simplest acceptable fits have only the relative contribution of the lagged component in the hard band varying with flux level, which can be associated with changes in the energy spectrum. We discuss the interpretation of these results in terms of the currently popular models for X-ray time lags.
Comments: 9 pages, 4 figures. Accepted for publication in MNRAS
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1307.6371 [astro-ph.HE]
  (or arXiv:1307.6371v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1307.6371
Related DOI: https://doi.org/10.1093/mnras/stt1391

Submission history

From: William Alston MPhys [view email]
[v1] Wed, 24 Jul 2013 10:25:04 UTC (143 KB)
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