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Title:
The ASCA X-ray spectrum of the powerful radio galaxy 3C 109
Authors:
Allen, S. W.; Fabian, A. C.; Idesawa, E.; Inoue, H.; Kii, T.; Otani, C.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AC(Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan ), AD(Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, Kanagawa 229, Japan ), AE(Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, Kanagawa 229, Japan ), AF(RIKEN, Institute of Physical and Chemical Research, Hirosawa, Wako, Saitama 351- 01, Japan )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 3, pp. 765-770. (MNRAS Homepage)
Publication Date:
04/1997
Origin:
MNRAS
MNRAS Keywords:
GALAXIES: ACTIVE, GALAXIES: INDIVIDUAL: 3C 109, X-RAYS: GALAXIES
Bibliographic Code:
1997MNRAS.286..765A

Abstract

We report the results from an ASCA X-ray observation of the powerful broad-line radio galaxy 3C 109. The ASCA spectra confirm our earlier ROSAT detection of intrinsic X-ray absorption associated with the source. The absorbing material obscures a central engine of quasar-like luminosity. The luminosity is variable, having dropped by a factor of 2 since the ROSAT observations 4 years before. The ASCA data also provide evidence for a broad iron emission line from the source, with an intrinsic FWHM of ~120 000kms^-1. Interpreting the line as fluorescent emission from the inner parts of an accretion disc, we can constrain the inclination of the disc to be >35 deg, and the inner radius of the disc to be <70 Schwarzschild radii. Our results support unified schemes for active galaxies, and demonstrate a remarkable similarity between the X-ray properties of this powerful radio source and those of lower luminosity, Seyfert 1 galaxies.

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