各向异性星际辐射场作用下球形硅酸盐颗粒的扭矩
Torques on Spheroidal Silicate Grains Exposed to Anisotropic Interstellar Radiation Fields
摘要：
由于星光的吸收和散射而产生的辐射力矩，被认为在星际磁场的作用下，对晶粒的排列起着重要的作用。辐射的吸收也引起反冲力矩，与光电效应和光脱附有关。反冲力矩比直接辐射力矩更难建模和计算。在这里，我们考虑相对简单的情况下，一个球状颗粒。鉴于我们对光电产额和其他相关谷物物理性质的最佳估计，我们发现反冲扭矩的贡献与直接辐射扭矩相比在10%或更低的水平。我们建议在辐射驱动药柱排列的模型中不包括反冲力矩。然而，需要对亚微米晶粒的表面性质和光电产率进行额外的实验表征，以更好地量化这些扭矩的大小。
英文摘要：
Radiative torques, due to the absorption and scattering of starlight, are thought to play a major role in the alignment of grains with the interstellar magnetic field. The absorption of radiation also gives rise to recoil torques, associated with the photoelectric effect and photodesorption. The recoil torques are much more difficult to model and compute than the direct radiative torque. Here, we consider the relatively simple case of a spheroidal grain. Given our best estimates for the photoelectric yield and other relevant grain physical properties, we find that the recoil torques contribute at the 10% level or less compared with the direct radiative torque. We recommend that the recoil torques not be included in models of radiation-driven grain alignment at this time. However, additional experimental characterization of the surface properties and photoelectric yield for sub-micron grains is needed to better quantify the magnitude of these torques.
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