Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-27
Astrophys.J. 612 (2004) 786-796
Astronomy and Astrophysics
Astrophysics
35 pages, 12 figures. Minor typographical issues updated
Scientific paper
10.1086/422806
We present X-ray spectra of the nucleus of the nearby radio galaxy Centaurus A from observations with the XMM-Newton EPIC CCD cameras (two exposures separated by 12 months) and the Chandra HETGS. For the first time in an FRI type galaxy, we resolve fluorescent K$\alpha$ emission from cold, neutral, or near-neutral iron at 6.4 keV, with an rms line width of $\sim$20 eV. The Fe line parameters observed are consistent with fluorescent emission from material at a large distance from the AGN, either in the form of an absorber that nearly completely surrounds the central engine or a torus that lies predominantly out of the line of sight. Unresolved emission lines from neutral Si K$\alpha$ at 1.74 keV and neutral S K$\alpha$ at 2.30 keV are also detected. We find no evidence in the data for a previously reported 6.8 keV broadened Fe line. The continuum spectrum is well fitted with a combination of a heavily absorbed power-law component that we relate, using Bondi theory, to accretion phenomena in the form of a standard, geometrically thin, optically thick disk, and a second, less absorbed, power-law component that we associate with emission from the subparsec VLBI radio jet.
Evans Daniel A.
Forman William R.
Hardcastle Martin J.
Jones Christine
Kraft Ralph Porter
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