Current Status of X-ray Spectroscopy and Relevant Atomic Data

Physics – Atomic Physics

Scientific paper

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Scientific paper

With the advent of the high-resolution grating spectrometers on board the Chandra and XMM-Newton observatories, X-ray spectroscopy has become the most powerful tool for X-ray measurements in space. The increasing role of spectroscopy has naturally drawn attention to the relevant atomic physics and atomic data, as those are directly linked with our ability to draw meaningful conclusions from observed spectra. A review of the atomic data needs for analyzing cosmic X-ray spectra is presented including the various line-excitation mechanisms. The adequacy of the existing data is assessed. In general, a combination of state-of-the-art atomic codes and high precision laboratory measurements provide a reasonable description of the overwhelming majority of cosmic spectra. However, in a few intriguing cases, non-standard models and special laboratory measurements are still required, examples of which are the 2p - 3s lines of Fe-L ions and inner-shell absorption lines of low-Z elements.

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