X-Ray Resonance Opacity of Oxygen and Iron in AGN MCG--6-30-15

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dc.creatorPradhan, Anil K.
dc.creatorChen, Guo-Xin
dc.creatorDelahaye, Franck
dc.creatorNahar, Sultana N.
dc.creatorOelgoetz, Justin
dc.date2002-04-08
dc.date2002-04-09
dc.date.accessioned2026-07-07T08:22:22Z
dc.date.available2026-07-07T08:22:22Z
dc.descriptionTheoretical differential oscillator strengths related to monochromatic opacity due to K- and L-shell absorption from oxygen and iron ions are directly compared with the Chandra and Xmm-Newton spectra of Seyfert~1 galaxy MCG--6-30-15. We compute the highly resolved continuum with resonances due to O I - VI and Fe XVI. It is found that the KLn (n --> infty) resonance series limits in O VI, and the lowest LMM resonance in Fe XVI, lie at the prominent 17.5 A break in the observed spectra. We also calculate and identify, for the first time, the observed gap in spectral flux at 22-23 A in the Chandra spectra due to K --> L resonant absorption features from all O-ions O I - VI, potentially leading to abundance determination of several or all ionization stages; similar signature gaps may be predicted due to other elements. The precise atomic parameters are computed in the relativistic close coupling approximation using the Breit-Pauli R-matrix method. The new X-ray opacities might possibly distinguish between models of a dusty warm absorber, and/or gravitational redshift and broadening due to a massive black hole in MCG--6-30-15.
dc.description16 pages, 3 figures. Fig. 2 is in color, available from http://www.astronomy.ohio-state.edu/~oelgoetz/xop-mcg6.html
dc.identifierhttps://arxiv.org/abs/astro-ph/0204116
dc.identifierhttp://arxiv.org/abs/astro-ph/0204116
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135631
dc.subjectAstrophysics
dc.subjectAtomic Physics
dc.titleX-Ray Resonance Opacity of Oxygen and Iron in AGN MCG--6-30-15
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