NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T07:00:33 PDT
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For refcode 2006A&A...448..499B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2006A&A...448..499B The soft X-ray/NLR connection: a single photoionized medium? S. Bianchi, M. Guainazzi and M. Chiaberge Received 23 August 2005 / Accepted 29 October 2005 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. Key words: galaxies: Seyfert, X-rays: galaxies
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