2016ApJ...817..139H -
Astrophys. J., 817, 139 (2016/February-1)
Accurate modeling of X-ray extinction by interstellar grains.
HOFFMAN J. and DRAINE B.T.
Abstract (from CDS):
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.
Abstract Copyright:
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Journal keyword(s):
dust, extinction - ISM: abundances - scattering - X-rays: general - X-rays: ISM
Simbad objects:
1
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