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X-ray variability of the Seyfert 1 Markarian 335: power spectrum and time lags

X-ray variability of the Seyfert 1 Markarian 335: power spectrum and time lags
X-ray variability of the Seyfert 1 Markarian 335: power spectrum and time lags
To investigate further the comparison between active galactic nuclei (AGN) and black hole X-ray binaries, we have studied the main X-ray variability properties of the Seyfert 1 galaxy Mrk 335. We put particular emphasis on the X-ray time lags, which is a potentially important diagnostic of physical models. From a 100 ks observation by XMM–Newton, we show that the power spectrum of this source is well fitted by a bending power-law model, and the bend time-scale Tb is precisely at the value predicted by the Tb versus H? linewidth relation of McHardy et al. Variations in different energy bands show time-scale-dependent time lags, where higher energy bands lag lower ones. The lag, ?, varies as a function of the Fourier frequency, f, of the variability component in the light curves as ??f?1 at low frequencies, but there is a sharp cut-off in the lags at a frequency close to the bend frequency in the power spectrum. Similar behaviour is seen in black hole X-ray binary systems. The length of the time lags increases continuously with energy separation, in an almost loglinear relation. We show that the lag spectra can be produced by fluctuations propagating through the accretion flow as long as the energy spectrum of the X-ray emitting region hardens towards the centre.
galaxies: active
0035-8711
211-218
Arvalo, P.
09b113a9-dd97-4a1d-8808-99af9cad078b
McHardy, I. M.
4f215137-9cc4-4a08-982e-772a0b24c17e
Summons, D. P.
55d43559-6af7-4e9b-8b8d-2278bdc1feb4
Arvalo, P.
09b113a9-dd97-4a1d-8808-99af9cad078b
McHardy, I. M.
4f215137-9cc4-4a08-982e-772a0b24c17e
Summons, D. P.
55d43559-6af7-4e9b-8b8d-2278bdc1feb4

Arvalo, P., McHardy, I. M. and Summons, D. P. (2008) X-ray variability of the Seyfert 1 Markarian 335: power spectrum and time lags. Monthly Notices of the Royal Astronomical Society, 388 (1), 211-218. (doi:10.1111/j.1365-2966.2008.13367.x).

Record type: Article

Abstract

To investigate further the comparison between active galactic nuclei (AGN) and black hole X-ray binaries, we have studied the main X-ray variability properties of the Seyfert 1 galaxy Mrk 335. We put particular emphasis on the X-ray time lags, which is a potentially important diagnostic of physical models. From a 100 ks observation by XMM–Newton, we show that the power spectrum of this source is well fitted by a bending power-law model, and the bend time-scale Tb is precisely at the value predicted by the Tb versus H? linewidth relation of McHardy et al. Variations in different energy bands show time-scale-dependent time lags, where higher energy bands lag lower ones. The lag, ?, varies as a function of the Fourier frequency, f, of the variability component in the light curves as ??f?1 at low frequencies, but there is a sharp cut-off in the lags at a frequency close to the bend frequency in the power spectrum. Similar behaviour is seen in black hole X-ray binary systems. The length of the time lags increases continuously with energy separation, in an almost loglinear relation. We show that the lag spectra can be produced by fluctuations propagating through the accretion flow as long as the energy spectrum of the X-ray emitting region hardens towards the centre.

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More information

Published date: July 2008
Keywords: galaxies: active
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 144659
URI: https://eprints.soton.ac.uk/id/eprint/144659
ISSN: 0035-8711
PURE UUID: 65eda01a-4cc6-4f79-8f03-656dd3243603

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Date deposited: 26 May 2010 15:41
Last modified: 17 Jul 2019 00:07

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