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

Research output: Contribution to journalArticle

13 Citations (Scopus)

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

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occultation
ionization
galaxies
x rays
cold gas
ionized gases
optical properties
nuclei
radii
gas

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Iwasawa, K. ; Matt, G. ; Fabian, A. C. ; Bianchi, S. ; Brandt, W. N. ; Guainazzi, M. ; Murayama, T. ; Taniguchi, Y. / Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383. In: Monthly Notices of the Royal Astronomical Society. 2001 ; Vol. 326, No. 1. pp. 119-125.
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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.",
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Iwasawa, K, Matt, G, Fabian, AC, Bianchi, S, Brandt, WN, Guainazzi, M, Murayama, T & Taniguchi, Y 2001, 'Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383', Monthly Notices of the Royal Astronomical Society, vol. 326, no. 1, pp. 119-125. https://doi.org/10.1046/j.1365-8711.2001.04585.x

Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383. / Iwasawa, K.; Matt, G.; Fabian, A. C.; Bianchi, S.; Brandt, W. N.; Guainazzi, M.; Murayama, T.; Taniguchi, Y.

In: Monthly Notices of the Royal Astronomical Society, Vol. 326, No. 1, 01.09.2001, p. 119-125.

Research output: Contribution to journalArticle

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T1 - Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383

AU - Iwasawa, K.

AU - Matt, G.

AU - Fabian, A. C.

AU - Bianchi, S.

AU - Brandt, W. N.

AU - Guainazzi, M.

AU - Murayama, T.

AU - Taniguchi, Y.

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N2 - 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.

AB - 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.

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