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16 papers · 2 filters
Modelling the broad Fe Kα reverberation in the AGN NGC 4151
E. M. Cackett, A. Zoghbi, C. Reynolds +4
The recent detection of X-ray reverberation lags, especially in the Fe Kα line region, around Active Galactic Nuclei (AGN) has opened up the possibility of studying the time-resolv…
The curious time lags of PG 1244+026: Discovery of the iron K reverberation lag
E. Kara, E. M. Cackett, A. C. Fabian +2
High-frequency iron K reverberation lags, where the red wing of the line responds before the line centroid, are a robust signature of relativistic reflection off the inner accretio…
X-ray and UV correlation in the quiescent emission of Cen X-4, evidence of accretion and reprocessing
F. Bernardini, E. M. Cackett, E. F. Brown +5
We conducted the first long-term (60 days), multiwavelength (optical, ultraviolet, and X-ray) simultaneous monitoring of Cen X-4 with daily Swift observations, with the goal of und…
Hard X-ray Lags in Active Galactic Nuclei: Testing the Distant Reverberation Hypothesis with NGC 6814
D. J. Walton, A. Zoghbi, E. M. Cackett +7
We present an X-ray spectral and temporal analysis of the variable active galaxy NGC 6814, observed with Suzaku during November 2011. Remarkably, the X-ray spectrum shows no eviden…
Calculating Time Lags From Unevenly-Sampled Light Curves
Abderahmen Zoghbi, Chris Reynolds, Ed Cackett
Timing techniques offer powerful tools to study dynamical astrophysical phenomena. In the X-ray band, they offer the potential of probing accretion physics down to the event horizo…
Broad iron lines in neutrons stars: dynamical broadening or wind scattering?
Edward M. Cackett, Jon M. Miller
Broad iron emission lines are observed in many accreting systems from black holes in AGN and X-ray binaries to neutron star low-mass X-ray binaries. The origin of the line broadeni…