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

doi:10.1046/j.1365-8711.2001.04585.x

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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13 Scopus citations

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.

Original language	English (US)
Pages (from-to)	119-125
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	326
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2001.04585.x
State	Published - Sep 1 2001

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.2001.04585.x

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title = "Nuclear obscuration in the high-ionization Seyfert 2 galaxy Tol 0109-383",

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.",

author = "K. Iwasawa and G. Matt and Fabian, {A. C.} and S. Bianchi and Brandt, {W. N.} and M. Guainazzi and T. Murayama and Y. Taniguchi",

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doi = "10.1046/j.1365-8711.2001.04585.x",

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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.

PY - 2001/9/1

Y1 - 2001/9/1

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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JO - Monthly Notices of the Royal Astronomical Society

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

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