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Title:
ASCA spectroscopy of IRAS 23060+0505: penetrating the torus of a type 2 quasar with X-rays
Authors:
Brandt, W. N.; Fabian, A. C.; Takahashi, K.; Fujimoto, R.; Yamashita, A.; Inoue, H.; Ogasaka, Y.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AC(Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229, Japan ), AD(Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229, Japan ), AE(Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229, Japan ), AF(Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Sagamihara, Kanagawa 229, Japan ), AG(NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 4, pp. 617-622. (MNRAS Homepage)
Publication Date:
10/1997
Origin:
MNRAS
MNRAS Keywords:
GALAXIES: INDIVIDUAL: IRAS 23060+0505, GALAXIES: SEYFERT, X-RAYS: GALAXIES
Bibliographic Code:
1997MNRAS.290..617B

Abstract

We report on a pointed ASCA observation of the powerful (L_bol~1.3x10^46 erg s^-1) type 2 infrared luminous galaxy IRAS 23060+0505. This galaxy has been the subject of detailed spectroscopic and spectropolarimetric studies which have revealed a hidden broad-line region and have been used to construct a detailed model of the light paths in this source. Our observation detects IRAS 23060+0505 in the X-ray band for the first time and complements the optical and infrared studies. We detect hard X-ray emission that can be modelled as a power law with a 2-10 keV luminosity of 1.5x10^44 erg s^-1, thereby verifying the existence of an accreting supermassive black hole in IRAS 23060+0505. The obscuring torus of IRAS 23060+0505 appears to be Compton thin along our line of sight, and we measure a column to the nuclear X-ray source of about 8x10^22 cm^-2. Comparison of the X-ray column with the A_V=30+/-4 mag extinction measurement by Young et al. suggests that the torus may have a dust-to-gas ratio rather similar to that in the interstellar medium of the Milky Way. We also find some evidence for iron K-line emission. The apparent X-ray to bolometric luminosity ratio for IRAS 23060+0505 is <~1 per cent, a rather low value, and we consider possible explanations for this low ratio.

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