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

Abstract

We investigate the ionic column density variability of the ionized outflows associated with NGC$\sim$7469, to estimate their location and power. This could allow a better understanding of galactic feedback of AGNs to their host galaxies. Analysis of seven XMM-Newton grating observations from 2015 is reported. We use an individual-ion spectral fitting approach, and compare different epochs to accurately determine variability on time-scales of years, months, and days. We find no significant column density variability in a 10 year period implying that the outflow is far from the ionizing source. The implied lower bound on the ionization equilibrium time, 10 years, constrains the lower limit on the distance to be at least 12 pc, and up to 31 pc, much less but consistent with the 1 kpc wide starburst ring. The ionization distribution of column density is reconstructed from measured column densities, nicely matching results of two 2004 observations, with one large high ionization parameter ($\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 for kinetic power, $\propto 1/\xi$, hampers tight constraints on the feedback mechanism of outflows with a large range in ionization parameter, which is often observed and indicates a non-conical outflow. The kinetic power of the outflow is estimated here to be within 0.4 and 60 \% of the Eddington luminosity, depending on the ion used to estimate $\xi$.

13 pages, 9 Figures

References in corpus (4)

• Anatomy of the AGN in NGC 5548: II. The Spatial, Temporal and Physical Nature of the Outflow from HST/COS Observations
• The mass-energy budget of the ionised outflow in NGC 7469
• Radiation Pressure Confinement -- III. The origin of the broad ionization distribution in AGN outflows
• Multiwavelength campaign on Mrk 509 XV. A global modeling of the broad emission lines in the Optical, UV and X-ray bands

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• Multi-wavelength campaign on NGC 7469 V. Analysis of the HST/COS observations: Super solar metallicity, distance, and trough variation models
• Effects of ultra-fast outflows on X-ray time lags in AGN
• The ionic composition of the local absorber towards 3C 273
• Testing X-ray Reprocessing and Mapping the Soft Excess of NGC 7469 with NICER