Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-22
Astrophys.J.622:L97-L100,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, accepted by ApJ Letters
Scientific paper
10.1086/429691
We present evidence for a broad, ionized Fe K line in the XMM-Newton spectrum of the broad-line radio galaxy (BLRG) 4C+74.26. This is the first indication that the innermost regions of the accretion flow in BLRGs contain thin, radiatively efficient disks. Analysis of the 35 ks XMM-Newton observation finds a broad line with an inner radius close to the innermost stable circular orbit for a maximally spinning black hole. The outer radius of the relativistic line is also found to be within 10 gravitational radii. The Fe K line profile gives an inclination angle of ~40 degrees, consistent with the radio limit. There are two narrow components to the Fe K complex: one at 6.4 keV from neutral Fe, and one at 6.2 keV. These may form the blue and red horns of a diskline from farther out on the disk, but a longer observation is required to confirm this hypothesis. We discuss the implications of this observation for models of jet production, and suggest that BLRGs and radio-loud quasars will have larger than average black hole masses, thus resulting in thicker accretion flows close to the black hole.
Ballantyne David R.
Fabian Andrea C.
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