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It is
illuminating to see how our understanding of astrophysical sources
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evolves as the
quality of our X-ray spectral data improves.
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In some cases,
the very early measurements and interpretations were
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remarkably
accurate, even though the data were quite crude (e.g. stellar
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coronae,
interstellar absorption).
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In others, the
higher resolution spectra have shown that our earlier
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spectral models
were completely wrong (e.g. Seyfert 2’s, early-type
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stars).
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I do not expect
to see such a significant “jump” with future
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experiments. Hopefully, X-ray spectroscopy will then
become more of
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a standard tool,
and less of a novelty.
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In any case, the
last three years have been very exciting.
I suspect we
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can look forward
to at least a few more years in the same vein.
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