Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383

K. Iwasawa, G. Matt, A. C. Fabian, S. Bianchi, W. N. Brandt, M. Guainazzi, T. Murayama, Y. Taniguchi

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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 NH ∼ 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.

Original languageEnglish (US)
Pages (from-to)119-125
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume326
Issue number1
DOIs
StatePublished - Sep 1 2001

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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