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The origin of the soft X-ray excess in AGN has been a mystery ever since itsdiscovery. We present how the time variability of this spectral component canpoint towards its origin. Using the powerful technique of multi-epoch fitting,we study how the soft excess in a given object depends on other parameters ofthe continuum and the accretion disk possibly hinting at its nature. As anexample, we present results from this technique applied to the Seyfert galaxyMrk 841. We study all (3) XMM and some of the Suzaku pointings available andfind that the source displays an impressive variability in the soft X-ray bandon the timescale of years. We study several common soft excess models and theirability to physically consistently explain this spectral variability. Mrk 841is found to show a distinct variability pattern that can be best explained bythe soft excess originating mostly from a thermal Comptonization component. Thevariability timescale can be constrained to be on the order of a few days.

Tackling the soft X-ray excess in AGN with variability studies