Optical, UV, and x-ray scattering by interstellar dust grains
Apr, 200336 pages
Published in:
- Astrophys.J. 598 (2003) 1017-1025
e-Print:
- astro-ph/0304060 [astro-ph]
DOI:
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Abstract: (arXiv)
Scattering and absorption properties at optical and ultraviolet wavelengths are calculated for an interstellar dust model consisting of carbonaceous grains and amorphous silicate grains. Polarization as a function of scattering angle is calculated for selected wavelengths from the IR to the vacuum UV. The widely-used Henyey-Greenstein phase function provides a good approximation for the scattering phase function between ~0.4 and 1 micron, but fails to fit the calculated phase functions at shorter wavelengths and longer wavelengths. A new analytic phase function is presented. It is exact at long wavelengths, and provides a good fit to the numerically-calculated phase function for lambda > 0.27um. Observational determinations of the scattering albedo and - ULTRAVIOLET ISM
- X-RAY ISM
- POLARIZATION
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