论文标题
通过辐射扭矩对不规则晶粒的比对：效率研究
Alignment of irregular grains by radiative torques: efficiency study
论文作者
论文摘要
我们研究了辐射扭矩（大鼠）的晶粒对齐效率，以使谷物合奏。将谷物建模为扁平球体和扁平球体的集合，变形为高斯随机椭圆形，并使用数值精确的方法求解它们的散射相互作用。我们定义了晶粒的分数，这些晶粒既快速旋转又表现出与垂直于磁场的晶粒长轴的完美对齐。我们证明，对于典型的星际条件，由大鼠机制产生的比对度明显大于基于顺磁性弛豫的戴维斯 - 格林斯坦（DG）机制所产生的比对程度。我们量化了与对齐的疗效有关的因素，并表明它与大鼠理论的分析模型（AMO）的$ q_ \ mathrm {max} $有关。我们的结果表明，即使晶粒没有磁性夹杂物，大鼠比对也可能足够强大，并且可以解释观察结果。
We study the efficiency of grain alignment by radiative torques (RATs) for an ensemble of irregular grains. The grains are modeled as ensembles of oblate and prolate spheroids, deformed as Gaussian random ellipsoids, and their scattering interactions are solved using numerically exact methods. We define the fraction of the grains that both rotate fast and demonstrate perfect alignment with grain long axes perpendicular to the magnetic field. We demonstrate that for typical interstellar conditions the degree of alignment arising from the RAT mechanism is significantly larger than that arising from the Davis-Greenstein (DG) mechanism based on paramagnetic relaxation. We quantify a factor related to the efficacy of alignment and show that it is related to a $q_\mathrm{max}$-factor of analytical model (AMO) of the RAT theory. Our results indicate that the RAT alignment can potentially be sufficiently strong and to explain observations even if grains do not have magnetic inclusions.
