Abstract & pre-registration

[Dragan Lukic <lukic@astro.columbia.edu>]

Registration form
-----------------------------------------------------------------------Last
name: Lukic
First name: Dragan
Middle name/initial:
Affiliation: Columbia Astrophysics Laboratory
Street Address: 550 West 120th Street, Mail Code 5247
City: New York
State: NY
Postal Code: 10027
Country: U.S.A
Tel: (212)854-1449
Fax: (212)854-8121
E mail: lukic@astro.columbia.edu
Citizenship*: Serbia
Abstract title Dielectronic Recombination In Active Galactic Nuclei
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*Non-US citizens should contact Cara Loomis if travel reimbursement for
the Workshop is required.

Please find attached abstract.

Best Regards
Dr Dragan Lukic
Columbia Astrophysics Laboratory
MC 5247
550 West 120th Street
New York, NY 10027
Office: 212-854-1449
Fax:    212-854-8121
email: lukic@astro.columbia.edu


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\title{Dielectronic Recombination In Active Galactic Nuclei}





\author{

D. Luki\' c$^1$, Z. Altun$^2$, N. R. Badnell$^3$, C. Brandau$^{4,5}$,\\ 

M. Lestinsky$^6$, A. M\"{u}ller$^4$, D. W. Savin$^1$, S. Schippers$^4$,\\ 

E. W. Schmidt$^4$, M. Schnell$^1$, F. Sprenger$^6$, and A. Wolf$^6$\\ \\

$^1$Columbia Astrophysics Laboratory, New York, NY, USA\\

$^2$Marmara University, Istanbul, Turkey\\

$^3$University of Strathclyde, Glasgow, UK\\

$^4$Justus-Liebig-Universit\"{a}t, Giessen, Germany\\

$^5$Gesellschaft f\"{u}r Schwerionenforschung, Darmstadt, Germany\\

$^6$Max-Planck-Institut f\"{u}r Kernphysik, Heidelberg, Germany\\}







\date{2 December 2005}



\maketitle



\begin{abstract}



XMM-Newton and Chandra observations of active galactic nuclei show a rich spectrum 

of X-ray absorption lines.  These observations have detected a broad unresolved 

transition array (UTA) between $\approx$ 15-17 \AA. This is attributed to inner-shell photoexcitation 

of M-shell iron ions. Modelling 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 at the Max-Plank-Institute for Nuclear Physics in Heidelberg, Germany. Storage 

rings are currently the only laboratory method capable of studying low temperature DR. We 

use our results to produce experimentally-derived DR rate coefficients. We are also providing 

our data to atomic theorist to benchmark their DR calculations. Here we will report our recent 

DR results for selected Fe M-shell ions. 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.

	

This work has been supported in part by NASA, the German Federal Ministry for Education and Research, 

and the German Research Council.



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