X-ray Reverberation Signals in Suzaku Observations of NGC 4051

Details X-ray Reverberation Signals in Suzaku Observations of NGC 4051 X-ray Reverberation Signals in Suzaku Observations of NGC 4051

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0821m&link_type=abstract

American Astronomical Society, HEAD meeting #11, #8.21; Bulletin of the American Astronomical Society, Vol. 41, p.666

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Scientific paper

Long Suzaku observations of the nearby type I AGN NGC 4051 from 2005 and 2008 have been analysed, investigating both the X-ray spectral variability and the short-timescale timing signals. A maximum-likelihood method, that is immune to gaps in the Suzaku time series, was used to measure the power spectrum and timing lags. We find time lags of 970 +/- 225s between hard and soft bands and show that both the frequency-dependence and the energy-dependence of the lags are consistent with being caused by time-delayed reflection from material about 600 gravitational radii from the central source. A high covering factor of material is implied, consistent with the spectral analysis. There is no requirement for any reflection from the inner accretion disk. Other AGN such as Ark 564 that show similar time lags may also be explained in this way.

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