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We examine archival XMM-Newton data on the extremely variable narrow-lineSeyfert 1 (NLS1) active galactic nucleus (AGN) 1H 0707-495. We constructfractional excess variance (Fvar) spectra for each epoch, including the recent2019 observation taken simultaneously with eROSITA. We explore both intrinsicand environmental absorption origins for the variability in different epochs,and examine the effect of the photoionised emission lines from outflowing gas.In particular, we show that the unusual soft variability first detected byeROSITA in 2019 is due to a combination of an obscuration event and strongsuppression of the variance at 1 keV by photoionised emission, which makes thevariance below 1 keV appear more extreme. We also examine the variability onlong timescales, between observations, and find that it is well described by acombination of intrinsic variability and absorption variability. We suggestthat the typical extreme high frequency variability which 1H 0707-495 is knownfor is intrinsic to the source, but the large amplitude, low frequencyvariability that causes prolonged low-flux intervals is likely dominated byvariable low-ionisation, low velocity absorption.

The nature of the extreme X-ray variability in the NLS1 1H 0707-495