论文标题
由微米大小的尘埃诱导的近红外光的高圆极化
High circular polarization of near infrared light induced by micron-size dust grains
论文作者
论文摘要
我们使用三维辐射转移计算探索了恒星形成区域中近红外光的圆极化（CP）的诱导。模拟在每个散射/吸收过程中都追踪了由组成的颗粒组成的尘土飞扬的散射/吸收过程中的变化。我们发现，随着灰尘颗粒的大小增加，CP学位大大扩大，并且超过$ \ sim 20 $ 20 $百分比。因此，如果微米大小的晶粒在尘土飞扬的气体板中占主导地位，则可以考虑在发光的年轻恒星物体周围观察到的高CP。 CP的分布显示了不对称四极杆模式，而不论谷物尺寸如何。另外，我们发现CP度取决于灰尘气板的相对位置。如果尘土飞扬的气板位于星形区域后面，则CP在$ 1.0〜 {\ rmμm} $ dust dust Grains的情况下达到$ \ sim 60 $ 60 $。因此，我们建议观察到的CP地图可以通过灰尘晶粒的不同尺寸分布和对齐晶粒的构型来解释。
We explore the induction of circular polarization (CP) of near-infrared light in star-forming regions using three-dimensional radiative transfer calculations. The simulations trace the change of Stokes parameters at each scattering/absorption process in a dusty gas slab composed of aligned grains. We find that the CP degree enlarges significantly according as the size of dust grains increases and exceeds $\sim 20$ percent for micron-size grains. Therefore, if micron-size grains are dominant in a dusty gas slab, the high CP observed around luminous young stellar objects can be accounted for. The distributions of CP show the asymmetric quadrupole patters regardless of the grain sizes. Also, we find that the CP degree depends on the relative position of a dusty gas slab. If a dusty gas slab is located behind a star-forming region, the CP reaches $\sim 60$ percent in the case of $1.0~{\rm μm}$ dust grains. Hence, we suggest that the observed variety of CP maps can be explained by different size distributions of dust grains and the configuration of aligned grains.
