The K-alpha complex of He-like iron with dielectronic satellites

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dc.creatorOelgoetz, Justin
dc.creatorPradhan, Anil K.
dc.date2001-06-19
dc.date.accessioned2026-07-07T08:22:22Z
dc.date.available2026-07-07T08:22:22Z
dc.descriptionIt is shown that the dielectronic satellites (DES) dominate X-ray spectral formation in the 6.7 keV K-alpha complex of Fe XXV at temperatures below that of maximum abundance in collisional ionization equilibrium T_m. Owing to their extreme temperature sensitivity the DES are excellent spectral diagnostics for T < T_m in photoionized, colllisional, or hybrid plasmas; whereas the forbidden, intercombination, and resonance lines of Fe XXV are not. A diagnostic line ratio GD(T) is defined including the DES and the lines, with parameters from new relativistic atomic calculations. The DES absorption resonance strengths may be obtained from differential oscillator strengths to possibly yield the Fe XXIV/Fe XXV column densities. The DES contribution to highly ionized Fe should be of interest for models of redward broadening of K-alpha features, ionized accretion discs, accretion flows, and K-alpha temporal-temperature variability in AGN.
dc.description5 pages, 4 Figs., submitted to MNRAS. High-resolution, full-size figures are available from http://www.astronomy.ohio-state.edu/~pradhan
dc.identifierhttps://arxiv.org/abs/astro-ph/0106330
dc.identifierhttp://arxiv.org/abs/astro-ph/0106330
dc.identifierMNRAS, 2001, 327, L42
dc.identifierdoi:10.1046/j.1365-8711.2001.04980.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135630
dc.subjectAstrophysics
dc.subjectAtomic Physics
dc.titleThe K-alpha complex of He-like iron with dielectronic satellites
dc.typetext

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