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We present the spectral/timing properties of the bare Seyfert galaxy Ark 120through a deep ~420ks XMM-Newton campaign plus recent NuSTAR observations and a~6-month Swift monitoring campaign. We investigate the spectral decompositionthrough fractional rms, covariance and difference spectra, finding the mid- tolong-timescale (~day-year) variability to be dominated by a relatively smooth,steep component, peaking in the soft X-ray band. Additionally, we find evidencefor variable FeK emission red-ward of the FeK-alpha core on long timescales,consistent with previous findings. We detect a clearly-defined power spectrumwhich we model with a power law with a slope of alpha ~ 1.9. By extending thepower spectrum to lower frequencies through the inclusion of Swift and RXTEdata, we find tentative evidence of a high-frequency break, consistent withexisting scaling relations. We also explore frequency-dependent Fourier timelags, detecting a negative ('soft') lag for the first time in this source withthe 0.3-1 keV band lagging behind the 1-4 keV band with a time delay of ~900s.Finally, we analyze the variability in the optical and UV bands using theOptical/UV Monitor on-board XMM-Newton and the UVOT on-board Swift and searchfor time-dependent correlations between the optical/UV/X-ray bands. We findtentative evidence for the U-band emission lagging behind the X-rays with atime delay of 2.4 +/- 1.8 days, which we discuss in the context of discreprocessing.

A deep X-ray view of the bare AGN Ark 120. III. X-ray timing analysis and multiwavelength variability