Scattering by interstellar dust grains. I. Optical and ultraviolet

被引:486
作者
Draine, BT [1 ]
机构
[1] Princeton Univ Observ, Princeton, NJ 08544 USA
基金
美国国家科学基金会;
关键词
dust; extinction; polarization; scattering; ultraviolet : ISM;
D O I
10.1086/379118
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:1017 / 1025
页数:9
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