Probing the Local Interstellar Medium with Scintillometry of the Bright Pulsar B1133 + 16
Probing the Local Interstellar Medium with Scintillometry of the Bright Pulsar B1133 + 16
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DOI：
10.3847/1538-4357/ac460b
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
J. McKee;Hengrui Zhu;D. Stinebring;J. Cordes
中科院分区：
文献类型：
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作者：
J. McKee;Hengrui Zhu;D. Stinebring;J. Cordes
星际介质中有大量散射屏，其中大部分来源不明。脉冲星的闪烁研究为解析这些散射屏提供了一种灵敏的工具，并提供了一种测量其特性的方法。在本文中，我们报告了对 PSR B1133 + 16 34 年阿雷西博观测的分析，从中我们获得了高质量的动态光谱及其相关的闪烁弧，这些闪烁弧是由沿着脉冲星视线的散射屏产生的。我们已经确定了六个单独的散射屏，它们导致了观察到的闪烁弧，这些闪烁弧持续了几十年。假设散射屏幕此时没有发生显着变化，我们对整个地球轨道上弧曲率的变化进行了建模，并提取了六个屏幕中五个屏幕的位置、方向和速度信息，最高精度的距离测量将屏幕放置在距地球仅 5.46−0.59+0.54 pc 处。我们将这些屏幕中较远的部分与局部气泡的低密度区域联系起来。
The interstellar medium hosts a population of scattering screens, most of unknown origin. Scintillation studies of pulsars provide a sensitive tool for resolving these scattering screens and a means of measuring their properties. In this paper, we report our analysis of 34 yr of Arecibo observations of PSR B1133 + 16, from which we have obtained high-quality dynamic spectra and their associated scintillation arcs, arising from the scattering screens located along the line of sight to the pulsar. We have identified six individual scattering screens that are responsible for the observed scintillation arcs, which persist for decades. Using the assumption that the scattering screens have not changed significantly in this time, we have modeled the variations in arc curvature throughout the Earth’s orbit and extracted information about the placement, orientation, and velocity of five of the six screens, with the highest-precision distance measurement placing a screen at just 5.46−0.59+0.54 pc from the Earth. We associate the more distant of these screens with an underdense region of the Local Bubble.