Conference paper

Appeared in: Contributed papers & abstracts of invited lectures, topical invited lectures and progress reports, 24th Summer School and International Symposium on Physics and Ionized Gases

Editor list: Malović, Gordana

Publication year: 2008

Pages: 99-102

ISBN: 978-86-80019-27-7

URL: https://ui.adsabs.harvard.edu/abs/2008POBeo..84...99L/abstract

Conference: 24th Summer School and International Symposium on the Physics of ionized Gases

Title of series: Publications of the Astronomical Observatory of Belgrade

Number in series: 84

Abstract: 

XMM-Newton and Chandra observations of active galactic nuclei (AGN) show rich spectra of X-ray absorption lines. These observations have detected a broad unresolved transition array (UTA) between 15-17 ºA. This is attributed to inner-shell photoexcitation of M-shell iron ions. Modeling these UTA features is currently limited by uncertainties in the low-temperature dielectronic recombination (DR) data for M-shell iron. In order to resolve this issue, and to provide reliable iron M-shell DR data for plasma modeling, we are carrying out a series of laboratory measurements using the heavy-ion Test Storage Ring (TSR) at the Max-Plank-Institute for Nuclear Physics in Heidelberg, Germany. Currently, laboratory measurements of low temperature DR can only be performed at storage rings. We use the DR data obtained at TSR, to calculate rate coefficients for plasma modeling and to benchmark theoretical DR calculations. At temperatures where these ions are predicted to form in photoionized gas, we find a significant discrepancy between our experimental results and previously recommended DR rate coefficients. Here we report our recent experimental results for DR of Mg-like Fe XV forming Al-like Fe XIV.

Harvard Citation style: Lukic, D., Schnell, M., Savin, D., Brandau, C., Schmidt, E., Böhm, S., et al. (2008) Dielectronic recombination measurements of iron M-shell ions motivated by active galactic nuclei X-ray absorption features, in Malović, G. (ed.) Contributed papers & abstracts of invited lectures, topical invited lectures and progress reports, 24th Summer School and International Symposium on Physics and Ionized Gases. Beograd. pp. 99-102. https://ui.adsabs.harvard.edu/abs/2008POBeo..84...99L/abstract

APA Citation style: Lukic, D., Schnell, M., Savin, D., Brandau, C., Schmidt, E., Böhm, S., Müller, A., Schippers, S., Lestinsky, M., Sprenger, F., Wolf, A., Altun, Z., & Badnell, N. (2008). Dielectronic recombination measurements of iron M-shell ions motivated by active galactic nuclei X-ray absorption features. In Malović, G. (Ed.), Contributed papers & abstracts of invited lectures, topical invited lectures and progress reports, 24th Summer School and International Symposium on Physics and Ionized Gases. (pp. 99-102). https://ui.adsabs.harvard.edu/abs/2008POBeo..84...99L/abstract