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Astron. Astrophys. 344, 857-867 (1999)

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5. Summary

The main results derived from the present BeppoSAX observation of Mkn 3 are the following:

  • Fit of the data above [FORMULA] 8 keV require a strongly absorbed power-law, with [FORMULA] [FORMULA] 1.3 [FORMULA] 1024 cm-2.

  • The intrinsic high-energy power-law continuum is steep ([FORMULA] [FORMULA] 1.8) and shows no high-energy cutoff up to [FORMULA] 150 keV, similar to what is found in most Seyfert 1 galaxies.

  • Having argued that a second absorbed power-law (i.e. a dual-absorber) is unlikely in this source, the data between [FORMULA] 2-10 keV require an unabsorbed reflection component to make the flat spectrum underlying the iron line.

  • From the data fit and the long-term X-ray history of the source, the (neutral) iron line intensity is consistent with being produced in an obscuring torus placed at a distance of [FORMULA] 2 pc from the source partly by transmission through its rim and partly by reflection over its inner surface.

  • Iron line emission is also detected at [FORMULA] 7.0 keV. It can be interpreted either as [FORMULA] emission associated to the neutral reflection component and/or to the absorption, either as H- and He-like Fe emission associated to the ionized soft scattered component, or a combination of the two. It could also be produced by an additional reflection component from a highly inclined relativistic accretion disk.

Overall, these results fit well into unified models scenarios of Seyfert galaxies and highlight the potentialities of using BeppoSAX in broad-band X-ray spectroscopy studies of buried sources like Seyfert 2 galaxies.

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© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999