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        Chandra and XMM-Newton Observations of the Nucleus of Centaurus A

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        Author
        Evans, D.A.
        Kraft, R.P.
        Worrall, D.M.
        Hardcastle, M.J.
        Jones, C.
        Forman, W.R.
        Murray, S.S.
        Attention
        2299/7336
        Abstract
        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 FR I type galaxy, we resolve fluorescent K emission from cold, neutral, or near-neutral iron at 6.4 keV, with an rms line width of 20 eV. The Fe line parameters observed are consistent with fluorescent emission from material at a large distance from the active galactic nucleus, 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 at 1.74 keV and neutral S K 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.
        Publication date
        2004-09
        Published in
        The Astrophysical Journal
        Other links
        http://hdl.handle.net/2299/7336
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