Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-10
Mon.Not.Roy.Astron.Soc.374:697-702,2007
Astronomy and Astrophysics
Astrophysics
6 pages, 6 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11183.x
We performed a detailed analysis of the Chandra and HST images of the Seyfert 2 galaxy, NGC7582. The dust lane, as mapped by the HST NIR and optical images, strongly influences the morphology of the soft X-ray emission, being spatially coincident with excess of X-ray absorption. Two 'hot spots', i.e. regions where emission from higher ionization stages of O and Ne is stronger, are observed in the soft X-ray image. They can be tracers of variations of the ionization parameter, even if, at least for one of them, absorption may be the dominant effect. The positions of the `hot spots' suggest that they are not affected by the star-formation regions observed with HST, being located far away from them. Therefore, the starburst does not seem to play an important role in the photoionization of the soft X-ray emitting gas. The resulting picture is consistent with modified unification scenarios, where the Compton-thick torus coexists with a large-scale Compton-thin material associated with the dust lane and circumnuclear gas is photoionized by the AGN along torus-free lines of sight.
Bianchi Stefano
Chiaberge Marco
Guainazzi Matteo
Piconcelli Enrico
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