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

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dc.creatorEvans, D. A.
dc.creatorKraft, R. P.
dc.creatorWorrall, D. M.
dc.creatorHardcastle, M. J.
dc.creatorJones, C.
dc.creatorForman, W. R.
dc.creatorMurray, S. S.
dc.date2004-05-27
dc.date2004-09-22
dc.date.accessioned2026-07-07T02:13:18Z
dc.date.available2026-07-07T02:13:18Z
dc.descriptionWe 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$α$ emission from cold, neutral, or near-neutral iron at 6.4 keV, with an rms line width of $\sim$20 eV. The Fe line parameters observed are consistent with fluorescent emission from material at a large distance from the AGN, either in the form of an absorber that nearly completely surrounds the central engine or a torus that lies predominantly out of the line of sight. Unresolved emission lines from neutral Si K$α$ at 1.74 keV and neutral S K$α$ 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.
dc.description35 pages, 12 figures. Minor typographical issues updated
dc.identifierhttps://arxiv.org/abs/astro-ph/0405539
dc.identifierhttp://arxiv.org/abs/astro-ph/0405539
dc.identifierAstrophys.J. 612 (2004) 786-796
dc.identifierdoi:10.1086/422806
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7767
dc.subjectAstrophysics
dc.titleChandra and XMM-Newton Observations of the Nucleus of Centaurus A
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