X-ray time delays from the Seyfert 2 galaxy IRAS 18325-5926
arXiv:1409.3189 · doi:10.1093/mnras/stu1888
Abstract
Using new XMM-Newton observations we detect hard X-ray time lags in the rapid variability of the Compton-thin Seyfert 2 galaxy IRAS 18325-5926. The higher-energy X-ray variations lag behind correlated lower-energy variations by up to ~3ks and the magnitude of the lag increases clearly with energy separation between the energy bands. We find that the lag-energy spectrum has a relatively simple log(E) shape. This is quite different in both shape and magnitude from the lags predicted by simple reflection models, but very similar to the hard X-ray lags often seen in black hole X-ray binaries. We apply several spectral models to the lag-energy spectrum and rule out simple reflection as an origin for the hard lags. We find that both propagating fluctuations embedded in the accretion flow and electron scattering from material embedded in or behind a cold absorbing medium offer equally good fits to the observed low-frequency hard X-ray lags and are both consistent with the time-averaged spectrum. Such models will likely look very different outside of XMM-Newton's observable bandpass, paving the way for future studies with NuSTAR.
Accepted for publication in MNRAS: 10 pages, 5 figures, 2 tables
References in corpus (5)
- An XMM-Newton survey of broad iron lines in Seyfert galaxies
- X-ray reverberation around accreting black holes
- Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
- Spectral-timing evidence for a Very High State in the Narrow Line Seyfert 1 Ark 564
- Observations of MCG-5-23-16 with Suzaku, XMM-Newton and NuSTAR: Disk tomography and Compton hump reverberation
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