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We investigate the ionic column density variability of the ionized outflowsassociated with NGC$\sim$7469, to estimate their location and power. This couldallow a better understanding of galactic feedback of AGNs to their hostgalaxies. Analysis of seven XMM-Newton grating observations from 2015 isreported. We use an individual-ion spectral fitting approach, and comparedifferent epochs to accurately determine variability on time-scales of years,months, and days. We find no significant column density variability in a 10year period implying that the outflow is far from the ionizing source. Theimplied lower bound on the ionization equilibrium time, 10 years, constrainsthe lower limit on the distance to be at least 12 pc, and up to 31 pc, muchless but consistent with the 1 kpc wide starburst ring. The ionizationdistribution of column density is reconstructed from measured column densities,nicely matching results of two 2004 observations, with one large highionization parameter ($\xi$) component at $2<\log \xi<3.5$, and one at$0.5<\log \xi<1$ in cgs units. The strong dependence of the expression forkinetic power, $\propto1/\xi$, hampers tight constraints on the feedbackmechanism of outflows with a large range in ionization parameter, which isoften observed and indicates a non-conical outflow. The kinetic power of theoutflow is estimated here to be within 0.4 and 60 \% of the Eddingtonluminosity, depending on the ion used to estimate $\xi$.

Multi-wavelength campaign on NGC7469 II. Column densities and variability in the X-ray spectrum