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The Seyfert 1 galaxy Mrk 279 was observed by XMM-Newton in November 2005 inthree consecutive orbits, showing significant short-scale variability (averagesoft band variation in flux ~20%). The source is known to host a two-componentwarm absorber with distinct ionisation states from a previous Chandraobservation. We aim to study the warm absorber in Mrk 279 and investigate anypossible response to the short-term variations of the ionising flux, and toassess whether it has varied on a long-term time scale with respect to theChandra observation. We find no significant changes in the warm absorber onneither short time scales (~2 days) nor at longer time scales (two and a halfyears), as the variations in the ionic column densities of the most relevantelements are below the 90% confidence level. The variations could still bepresent but are statistically undetected given the signal-to-noise ratio of thedata. Starting from reasonable standard assumptions we estimate the location ofthe absorbing gas, which is likely to be associated with the putative dustytorus rather than with the Broad Line Region if the outflowing gas is moving atthe escape velocity or larger.

XMM-Newton RGS observation of the warm absorber in Mrk 279