Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l.129w&link_type=abstract
Astrophysical Journal Letters v.447, p.L129
Astronomy and Astrophysics
Astronomy
17
Galaxies: Ism, Ism: Dust, Extinction, X-Rays: Galaxies, Techniques: Spectroscopic
Scientific paper
I show that new information about the compositions and crystal structures of interstellar grains can be derived from measurements of extended X-ray absorption fine structure (EXAFS) above the absorption edges in the spectra of highly extincted and bright X-ray stars. It will be also possible to probe the long-range crystal structures of solid grains by analyzing extended X-ray absorption-edge profiles modified by X-ray absorption near edge structure (XANES). I show that recently developed high-resolution (E/ Delta E ~ 1000) X-ray spectrometers (e.g., the High-Energy Transmission Grating Spectrometer on the Advanced X-Ray Astrophysics Facility [AXAF] or the Reflection Grating Spectrometer on the X-Ray Multi-Mirror satellite [XMM]) will be able to measure these features.
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