PSR B0329 +54：在基线高达330，000 km处使用RadioAstron发现的散射增宽图像中的子结构
PSR B0329+54: Substructure in the scatter-broadened image discovered with RadioAstron on baselines up to 330,000 km
摘要：
我们分辨了PSR B 0329 +54的散射增宽像，并探测到了其中的亚结构，这些结果不受源的任何扩展结构的影响，而是直接归因于星际介质。我们在324 MHz的地面空间干涉仪RadioAstron上获得了这些结果，其中包括空间射电望远镜（SRT），地基Westerbork综合射电望远镜和64米Kalyazin射电望远镜，基线投影高达330，000公里，2013年11月22日和2014年1月1日至2日。在短的15，000至35，000公里地面空间基线投影中，可见度幅度随基线长度而减小，提供了4.8 $\pm$ 0.8 mas的散射盘大小的直接测量。在较长的基线上，预计散射盘不会探测到能见度。然而，获得了显着的检测与能见度振幅的3%至5%的最大分散在一个平均值和近似恒定的高达330，000公里。这些粒子反映了星际介质散射的亚结构，为电离星际物质的研究提供了新的途径。地球附近的衍射光斑大小为17，000 $\pm$ 3，000 km。假设星际介质中的等离子体湍流不规则性，我们估计，有效的散射屏位于0.6 $\pm$ 0.1的距离从地球到脉冲星。
英文摘要：
We have resolved the scatter-broadened image of PSR B0329+54 and detected substructure within it. These results are not influenced by any extended structure of a source but instead are directly attributed to the interstellar medium. We obtained these results at 324 MHz with the ground-space interferometer RadioAstron which included the space radio telescope (SRT), ground-based Westerbork Synthesis Radio Telescope and 64-m Kalyazin Radio Telescope on baseline projections up to 330,000 km in 2013 November 22 and 2014 January 1 to 2. At short 15,000 to 35,000 km ground-space baseline projections the visibility amplitude decreases with baseline length providing a direct measurement of the size of the scattering disk of 4.8$\pm$0.8 mas. At longer baselines no visibility detections from the scattering disk would be expected. However, significant detections were obtained with visibility amplitudes of 3 to 5% of the maximum scattered around a mean and approximately constant up to 330,000 km. These visibilities reflect substructure from scattering in the interstellar medium and offer a new probe of ionized interstellar material. The size of the diffraction spot near Earth is 17,000$\pm$3,000 km. With the assumption of turbulent irregularities in the plasma of the interstellar medium, we estimate that the effective scattering screen is located 0.6$\pm$0.1 of the distance from Earth toward the pulsar.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
