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NGC 4151 is the brightest Seyfert 1 nucleus in X-rays. It was the firstobject to show short time delays in the Fe K band, which were attributed torelativistic reverberation, providing a new tool for probing regions at theblack hole scale. Here, we report the results of a large XMM-Newton campaign in2015 to study these short delays further. Analyzing high quality data that spantime scales between hours and decades, we find that neutral and ionizedabsorption contribute significantly to the spectral shape. Accounting for theireffects, we find no evidence for a relativistic reflection component, contraryto early work. Energy-dependent lags are significantly measured in the newdata, but with an energy profile that does not resemble a broad iron line, incontrast to the old data. The complex lag-energy spectra, along with the lackof strong evidence for a relativistic spectral component, suggest that theenergy-dependent lags are produced by absorption effects. The long termspectral variations provide new details on the variability of the narrow FeK$\alpha$ line . We find that its variations are correlated with, and delayedwith respect to, the primary X-ray continuum. We measure a delay of $\tau=3.3^{+1.8}_{-0.7}$ days, implying an origin in the inner broad line region(BLR). The delay is half the H$\beta$ line delay, suggesting a geometry thatdiffers slightly from the optical BLR.

Revisiting The Spectral and Timing Properties of NGC 4151