Journal
ASTRONOMY & ASTROPHYSICS
Volume 448, Issue 2, Pages 499-511Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20054091
Keywords
galaxies : Seyfert; X-rays : galaxies
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We present a sample of 8 nearby Seyfert 2 galaxies observed by HST and Chandra. All of the sources present soft X-ray emission which is coincident in extension and overall morphology with the [ O III] emission. The spectral analysis reveals that the soft X-ray emission of all the objects is likely to be dominated by a photoionized gas. This is strongly supported by the 190 ks combined XMM-Newton/RGS spectrum of Mrk 3, which different diagnostic tools confirm as being produced in a gas in photoionization equilibrium with an important contribution from resonant scattering. We tested with the code cloudy a simple scenario where the same gas photoionized by the nuclear continuum produces both the soft X-ray and the [O III] emission. Solutions satisfying the observed ratio between the two components exist, and require the density to decrease with radius roughly like r(-2), similarly to what often found for the Narrow Line Region.
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