X-RAY SPECTROSCOPY OF THE BROAD-LINE RADIO GALAXY 3C-111

Citation
Cs. Reynolds et al., X-RAY SPECTROSCOPY OF THE BROAD-LINE RADIO GALAXY 3C-111, Monthly Notices of the Royal Astronomical Society, 299(2), 1998, pp. 410-416
Citations number
30
Categorie Soggetti
Astronomy & Astrophysics
ISSN journal
00358711
Volume
299
Issue
2
Year of publication
1998
Pages
410 - 416
Database
ISI
SICI code
0035-8711(1998)299:2<410:XSOTBR>2.0.ZU;2-D
Abstract
We present an ASCA observation of the broad-line radio galaxy 3C 111. The X-ray spectrum is well described by a model consisting of a photoe lectrically absorbed power-law form. The inferred absorbing column den sity is significantly greater than expected on the basis of 21-cm meas urements of Galactic Hr. Whilst this may be the result of intrinsic ab sorption from a circumnuclear torus or highly warped accretion disc, i nhomogeneities and molecular gas within the foreground giant molecular cloud may also be responsible for some of this excess absorption. We also claim a marginal detection of a broad iron K alpha line which is well explained as being a fluorescent line originating from the centra l regions of a radiatively efficient accretion disc. This line appears weak in comparison to those found in (radio-quiet) Seyfert nuclei. We briefly discuss the implications of this fact.