Double-lens scintillometry: The variable scintillation of pulsar B1508+55
Double-lens scintillometry: The variable scintillation of pulsar B1508+55
复制标题
双透镜闪烁测量：脉冲星 B1508 55 的可变闪烁
DOI：
10.1093/mnras/stac2160
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发表时间：
2022
影响因子：
4.8
通讯作者：
Jason Wu
中科院分区：
文献类型：
--
作者：
T. Sprenger;R. Main;O. Wucknitz;Geetam Mall;Jason Wu
我们报告了从2020年初到2022年初在Effelsberg 100米望远镜上对PSR B1508+55闪烁的观测结果。在2020年秋季，接近脉冲星被预测在其脉冲轮廓中交叉回波的时间，观察到闪烁弧从特殊的条纹状特征突然过渡到抛物线弧。为了推断散射的几何模型，我们测量地球的年速度曲线的影响，视线的相对运动，和第二个散射屏幕上的点的投影，并开发新的方法来做到这一点。后一种现象是由这项研究发现的，强烈表明两个屏幕的散射几何形状。我们推导出一个分析的两个屏幕模型，并证明在马尔可夫链蒙特卡罗分析以及模拟，它可以成功地应用于解释的观察，通过解释的过渡作为图像的相对振幅的变化，以及在各向异性的方向的转变。我们在这里展示的方法的集合是可转移到其他的散射模型的潜力，大大提高约束。
We report on observations of PSR B1508+55’s scintillation at the Effelsberg 100-m telescope spanning from early 2020 to early 2022. In the autumn of 2020, close to the time the pulsar was predicted to cross echoes in its pulse profile, a sudden transition in the scintillation arcs from peculiar stripe-like features to parabolic arclets was observed. To infer a geometric model of the scattering we measure the effects of the annual velocity curve of Earth, of the relative movement of the line of sight, and of the projection of points on a second scattering screen and develop novel methods to do so. The latter phenomenon was discovered by this study and strongly indicates a two-screen scattering geometry. We derive an analytical two-screen model and demonstrate in a Markov Chain Monte Carlo analysis as well as simulations that it can be successfully applied to explain the observations by interpreting the transition as a change of relative amplitudes of images as well as a shift in the orientation of anisotropy. The collection of methods we demonstrate here is transferable to other pulsars with the potential to strongly improve constraints on scattering models.