The variable ionized absorber in the Seyfert 2 Mrk 348

Abstract

We present the results of the analysis of the X-ray spectrum of the Seyfert 2 Mrk 348, observed by Suzaku and XMM-Newton. The overall spectrum of Mrk 348 can be described by a primary power law continuum seen through three layers of absorption, of which one is neutral and two are ionised. Comparing Suzaku (2008) and XMM-Newton (2002) observations we find variability of the X-ray spectral curvature. We suggest that the variability can be explained through the change of column density of both the neutral and one of the ionised absorbers, together with a variation of the ionisation level of the same absorber. We thus confirm one of the main features presented in past works, where intrinsic column density variability up to $\sim 10^{23}$~cm${}^{-2}$ was observed on time scales of months. We also find that the photon index of the underlying power law continuum ($\Gamma \sim 1.8$) is in agreement with the previous observations of this Seyfert 2.

13 pages, 6 figures

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• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• Suzaku Observations of Moderately Obscured (Compton-thin) Active Galactic Nuclei Selected by Swift/BAT Hard X-ray Survey
• X-ray spectral variability of Seyfert 2 galaxies
• The variable and non-variable X-ray absorbers in Compton-thin type-II Active Galactic Nuclei
• Long-term X-ray stability and UV variability of the ionized absorption in NGC 3783