The Dielectric Function of "Astrodust", and Absorption and Scattering Cross Sections for Spheroids

Draine, Bruce T.; Hensley, Brandon S.
Issue date: 2021
Cite as:
Draine, Bruce T. & Hensley, Brandon S. (2021). The Dielectric Function of "Astrodust", and Absorption and Scattering Cross Sections for Spheroids [Data set]. Princeton University. https://doi.org/10.34770/9ypp-dv78
@electronic{draine_bruce_t_2021,
  author      = {Draine, Bruce T. and
                Hensley, Brandon S.},
  title       = {{The Dielectric Function of "Astrodust",
                and Absorption and Scattering Cross Sect
                ions for Spheroids}},
  publisher   = {{Princeton University}},
  year        = 2021,
  url         = {https://doi.org/10.34770/9ypp-dv78}
}
Abstract:

The dielectric function for "Astrodust" grain material is provided for different assumed values of the dust grain shape (spheroid axis ratio) and porosity (vacuum fraction), and fraction of the interstellar iron present as metallic inclusions. For each case, the dielectric function is obtained by requiring that the grains reproduce the observed infrared opacity, and match to a physically reasonable dielectric function at 1 micron, and extending to X-ray energies. The derived dielectric functions satisfy the Kramers-Kronig relations. Dielectric functions are provided from 1 Angstrom to 5 cm (12.4 keV to 2.59e-5 eV). For each dielectric function, we also calculate absorption and scattering corss sections for spheroidal grains, for three orientations of the grain relative to incident linearly-polarized light, for wavelengths from the Lyman limit (0.0912 micron) to the microwave (4 cm), and grain "effective radii" a_eff from 3.162A to 5.012 micron.

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# Filename Description Filesize
1 Readme.txt 4.59 KB
2 DH21Ad.html 21.3 KB
3 DH21_aeff list of a_{eff} values for tabulated cross sections 1.71 KB
4 DH21_wave list of wavelengths for tabulated cross sections 11.1 KB
5 index_DH21Ad_P0.00_0.00_0.333 347 KB
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