Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109–383 |
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| Authors: | K Iwasawa G Matt AC Fabian S Bianchi WN Brandt M Guainazzi T Murayama Y Taniguchi |
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| Institution: | 1Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;2Dipartimento di Fisica, Universitàdegli Studi Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy;3Department of Astronomy &Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA;4XMM-Newton SOC, VILSPA, ESA, Apartado 50727, E-28080 Madrid, Spain;5Astronomical Institute, Tohoku University, Aoba, Sendai 980-8678, Japan;6Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA |
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| Abstract: | We report on the BeppoSAX detection of a hard X-ray excess in the X-ray spectrum of the classical high-ionization Seyfert 2 galaxy Tol 0109–383. 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 caused by the central source absorbed by an optically thick obscuring torus with N H～2×1024 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 Tol 0109–383 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 such as the Seyfert 1 galaxy Mrk231. |
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| Keywords: | galaxies: individual: Tol " target="_blank"> galaxies: Seyfert X-rays: galaxies |
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