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- W2114861383 abstract "MCG-6-30-15 is one of the most observed narrow-line Seyfert 1 galaxies in the X-ray band. In this paper, we examine the X-ray time lags in this source using a total of 600 ks in observations (440 ks exposure) taken with the XMM–Newton telescope (300 ks in 2001 and 300 ks in 2013). Both the old and new observations show the usual hard lag that increases with energy; however, the hard lag turns over to a soft lag at frequencies below ∼10−4 Hz. The highest frequencies (∼10−3 Hz) in this source show a clear soft lag, as previously presented for the first 300 ks observation, but no clear iron K lag is detected in either the old or new observation. The soft lag is more significant in the old observation than the new. The observations are consistent with a reverberation interpretation, where the soft, reflected emission is delayed with respect to the hard power-law component. These spectral timing results suggest that two distinct variability mechanisms are important in this source: intrinsic coronal variations (which lead to correlated variability in the reprocessed emission) and geometrical changes in the corona. Variability due to geometrical changes does not result in correlated variability in the reflection, and therefore inhibits the clear detection of an iron K lag." @default.
- W2114861383 created "2016-06-24" @default.
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- W2114861383 date "2014-09-22" @default.
- W2114861383 modified "2023-10-18" @default.
- W2114861383 title "The changing X-ray time lag in MCG-6-30-15" @default.
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- W2114861383 doi "https://doi.org/10.1093/mnras/stu1750" @default.
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