Ion storage ring measurements of dielectronic recombination for astrophysically relevant Feq+ ions

Details Ion storage ring measurements of dielectronic recombination for astrophysically relevant Feq+ ions Ion storage ring measurements of dielectronic recombination for astrophysically relevant Feq+ ions

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..475..166s&link_type=abstract

The fifteenth international conference on the application of accelerators in research and industry. AIP Conference Proceedings,

Physics

Nuclear Physics

Properties Of Atoms, Photoionization Of Atoms And Ions, Atomic And Molecular Beam Sources And Techniques

Scientific paper

Iron ions provide many valuable plasma diagnostics for cosmic plasmas. The accuracy of these diagnostics, however, often depends on an accurate understanding of the ionization structure of the emitting gas. Dielectronic recombination (DR) is the dominant electron-ion recombination mechanism for most iron ions in cosmic plasmas. Using the heavy-ion storage ring at the Max-Planck-Institute for Nuclear Physics in Heidelberg, Germany, we have measured the low temperature DR rates for Feq+ where q=15, 17, 18, and 19. These rates are important for photoionized gases which form in the media surrounding active galactic nuclei, X-ray binaries, and cataclysmic variables. Our results demonstrate that commonly used theoretical approximations for calculating low temperature DR rates can easily under- or over-estimate the DR rate by a factor of ~2 or more. As essentially all DR rates used for modeling photoionized gases are calculated using these approximations, our results indicate that new DR rates are needed for almost all charge states of cosmically abundant elements. Measurements are underway for other charge states of iron.

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