论文标题
磁铁和快速无线电爆发的一对对称风中的法拉第转换
Faraday conversion in pair-symmetric winds of magnetars and Fast Radio Bursts
论文作者
论文摘要
我们考虑在靠近光缸的成对对称磁场风的内部传播偏振。磁场中的配对等离子体是双重的，是$ \ propto b^2 $效应。结果，这种等离子体像相位延迟器一样工作：stokes参数遵循庞贝雷球体上的圆形轨迹。在高度磁化的状态下，$ω，\，ω_p\llΩ_b$，相应的旋转速率与磁场无关。具有分散度量DM $ \ SIM 10^{ - 6} $ PC CM $^{ - 3} $的等离子体屏幕可以诱导大型变化，包括大量有效旋转度量（RM）。 （概括）RM，$ \ proptoλ^α$的频率缩放，模仿$α= 2 $的常规rm，用于小相移，但可以小于$α= 1 $。在解释观察结果时，应独立拟合极化参数的频率缩放。该模型提供了（i）在FRB中观察到的（i）大圆极化组件的解释，并右左开关； （ii）大的RM，可能会更改符号； （iii）时间依赖性变化。需要相对密集和慢的风 - 常规脉冲星的相应效果很小。
We consider propagation of polarization in the inner parts of pair-symmetric magnetar winds, close to the light cylinder. Pair plasmas in magnetic field is birefringent, a $\propto B^2$ effect. As a result, such plasmas work as phase retarders: Stokes parameters follow a circular trajectory on the Poincare sphere. In the highly magnetized regime, $ω, \, ω_p \ll ω_B$, the corresponding rotation rates are independent of the magnetic field. A plasma screen with dispersion measure DM $\sim 10^{-6}$ pc cm$^{-3}$ can induce large polarization changes, including large effective Rotation Measure (RM). The frequency scaling of the (generalized) RM, $ \propto λ^α$, mimics the conventional RM with $α=2$ for small phase shifts, but can be as small as $α=1$. In interpreting observations the frequency scaling of polarization parameters should be fitted independently. The model offers explanations for (i) large circular polarization component observed in FRBs, with right-left switching; (ii) large RM, with possible sign changes; (iii) time-depend variable polarization. Relatively dense and slow wind is needed - the corresponding effect in regular pulsars is small.
