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Evidence for an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C+74.26 | D.R. Ballantyne
; A.C. Fabian
; | Date: |
22 Feb 2005 | Journal: | Astrophys.J. 622 (2005) L97-L100 | Subject: | astro-ph | Affiliation: | CITA, Toronto IoA, Cambridge | Abstract: | 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. | Source: | arXiv, astro-ph/0502461 | Services: | Forum | Review | PDF | Favorites |
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