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- W3098800898 abstract "Interstellar abundance determinations from fits to X-ray absorption edges often rely on the incorrect assumption that scattering is insignificant and can be ignored. We show instead that scattering contributes significantly to the attenuation of X-rays for realistic dust grain size distributions and substantially modifies the spectrum near absorption edges of elements present in grains. The dust attenuation modules used in major X-ray spectral fitting programs do not take this into account. We show that the consequences of neglecting scattering on the determination of interstellar elemental abundances are modest; however, scattering (along with uncertainties in the grain size distribution) must be taken into account when near-edge extinction fine structure is used to infer dust mineralogy. We advertise the benefits and accuracy of anomalous diffraction theory for both X-ray halo analysis and near edge absorption studies. We present an open source Fortran suite, General Geometry Anomalous Diffraction Theory (GGADT), that calculates X-ray absorption, scattering, and differential scattering cross sections for grains of arbitrary geometry and composition." @default.
- W3098800898 created "2020-11-23" @default.
- W3098800898 creator A5023974267 @default.
- W3098800898 creator A5091899674 @default.
- W3098800898 date "2016-01-27" @default.
- W3098800898 modified "2023-09-26" @default.
- W3098800898 title "ACCURATE MODELING OF X-RAY EXTINCTION BY INTERSTELLAR GRAINS" @default.
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- W3098800898 doi "https://doi.org/10.3847/0004-637x/817/2/139" @default.
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