Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..630l&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations and analyses of the Fe K-alpha spectrum has long been a mainstay of astrophysical X-ray spectroscopy. This will continue to be true in the future with Astro-E 2 and Constellation-X in the offing. Advancements in detector capabilities exemplified by the XRS on Astro-E 2 promise to uncover the spectral complexity in the Fe K- alpha spectrum in several classes of celestial X-ray source complexity that has been observed only in solar and laboratory plasmas thus far. Since the spectra observed to date have not been of high quality models commonly used to analyze Fe K-alpha spectra from cosmic sources are often highly simplified. In order to upgrade the diagnostic capability associated with these spectra I have calculated detailed atomic models that include the effects of inner-shell photoionization autoionization collisional excitation at relatively high particle number densities and photoexcitation in plasmas with high X-ray and/or UV energy densities. I discuss the uses and limitations of these models in the context of compact X-ray sources.
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