期刊
ASTROPHYSICAL JOURNAL
卷 598, 期 2, 页码 1017-1025出版社
IOP PUBLISHING LTD
DOI: 10.1086/379118
关键词
dust, extinction; polarization; scattering; ultraviolet : ISM
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 infrared to the vacuum ultraviolet. The widely used Henyey-Greenstein phase function provides a good approximation for the scattering phase function at wavelengths between similar to0.4 and 1 mum but fails to fit the calculated phase functions at shorter 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 > 0.27 mum. Observational determinations of the scattering albedo and [cos theta] show considerable disagreement, especially in the ultraviolet. Possible reasons for this are discussed.
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