Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-10
Mon.Not.Roy.Astron.Soc.326:119,2001
Astronomy and Astrophysics
Astrophysics
7 pages, MNRAS in press
Scientific paper
10.1046/j.1365-8711.2001.04585.x
We report the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tol0109-383. The X-ray emission of this source observed below 7 keV is dominated by reflection from both cold and ionized gas, as seen in the ASCA data. The excess hard X-ray emission is presumably due to the central source absorbed by an optically thick obscuring torus with N(H)~2e24 cm-2. The strong cold X-ray reflection, if it is produced at the inner surface of the torus, is consistent with the picture where much of the inner nucleus of Tol0109-383 is exposed to direct view, as indicated by optical and infrared properties. However, the X-ray absorption must occur at small radii in order to hide the central X-ray source but leave the optical high-ionization emission line region unobscured. This may also be the case for objects like the Seyfert 1 galaxy Mrk231.
Bianchi Simone
Brandt Wiliam N.
Fabian Andrea C.
Guainazzi Matteo
Iwasawa Kashuzi
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