dc.contributor.author | Evans, D.A. | |
dc.contributor.author | Kraft, R.P. | |
dc.contributor.author | Worrall, D.M. | |
dc.contributor.author | Hardcastle, M.J. | |
dc.contributor.author | Jones, C. | |
dc.contributor.author | Forman, W.R. | |
dc.contributor.author | Murray, S.S. | |
dc.date.accessioned | 2011-12-19T15:01:30Z | |
dc.date.available | 2011-12-19T15:01:30Z | |
dc.date.issued | 2004-09 | |
dc.identifier.citation | Evans , D A , Kraft , R P , Worrall , D M , Hardcastle , M J , Jones , C , Forman , W R & Murray , S S 2004 , ' Chandra and XMM-Newton Observations of the Nucleus of Centaurus A ' , The Astrophysical Journal , vol. 612 , pp. 786-796 . | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | dspace: 2299/198 | |
dc.identifier.uri | http://hdl.handle.net/2299/7336 | |
dc.description.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. | en |
dc.format.extent | 389093 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | Astronomy | |
dc.title | Chandra and XMM-Newton Observations of the Nucleus of Centaurus A | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | SPECS Deans Group | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.description.status | Peer reviewed | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |