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We present a new analysis of the soft and medium energy X-ray spectrum of theSeyfert 1 galaxy NGC 3516 taken with the Reflection Grating Spectrometer (RGS)and European Photon Imaging Camera (EPIC) on board the XMM-Newton observatory.We examine four observations made in October 2006. We investigate whether theobserved variability is due to absorption by the warm absorber and/or isintrinsic to the source emission. We analyse in detail the EPIC-pn and RGSspectra of each observation separately. The warm absorber in NGC 3516 is foundto consist of three phases of ionisation, two of which have outflow velocitiesof more than 1000 km/s. The third phase (the least ionised one) is much slowerat 100 km/s. One of the high ionisation phases, with log xi of 2.4, is found tohave a partial covering fraction of about 60%. It has previously been suggestedthat the passage of a cloud, part of a disk wind, in front of the source(producing a change in the covering fraction) was the cause of a significantdip in the lightcurve during one of the observations. From our modelling of theEPIC-pn and RGS spectra, we find that variation in the covering fraction cannotbe solely responsible for this. We show that intrinsic change in the sourcecontinuum plays a much more significant role in explaining the observed fluxand spectral variability than originally thought.

The warm absorber and X-ray variability of the Seyfert 1 galaxy NGC 3516 as seen by the XMM-Newton RGS