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arXiv 2203.15134astro-ph.HEastro-ph.SR
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PSR B1957 +20食区附近强散射的探测

Detection of strong scattering close to the eclipse region of PSR B1957+20

J. T. Bai, S. Dai, Q. J. Zhi, W. A. Coles, D. Li, W. W. Zhu, G. Hobbs, G. J. Qiao, N. Wang, J. P. Yuan, M. D. Filipovic, J. B. Wang, Z. C. Pan, L. H. Shang, S. … 展开作者

J. T. Bai, S. Dai, Q. J. Zhi, W. A. Coles, D. Li, W. W. Zhu, G. Hobbs, G. J. Qiao, N. Wang, J. P. Yuan, M. D. Filipovic, J. B. Wang, Z. C. Pan, L. H. Shang, S. J. Dang, S. Q. Wang, C. C. Miao

摘要:

我们提出了第一次测量脉冲散射接近PSR B1957+20,这是在一个紧凑的二元系统与低质量的恒星的日食区。我们测量的脉冲散射时间尺度为0.2毫秒接近日食,并表明它的规模与分散措施(DM)过剩大致为$τ\proptoΔ{\rm DM}^{2}$。我们的观测提供了强散射的第一个证据,由于多路径传播效应的食材料。我们表明,Kolmogorov湍流的日食物质与$\sim100$ m的内部尺度和日食区域的大小的外部尺度可以很自然地解释观测。我们的研究结果表明,在这样的系统中的食材料可以是高度湍流的,并建议散射是在1.4 GHz左右的主要食机制之一。

英文摘要:

We present the first measurement of pulse scattering close to the eclipse region of PSR B1957+20, which is in a compact binary system with a low-mass star. We measured pulse scattering time-scales up to 0.2 ms close to the eclipse and showed that it scales with the dispersion measure (DM) excess roughly as $τ\proptoΔ{\rm DM}^{2}$. Our observations provide the first evidence of strong scattering due to multi-path propagation effects in the eclipsing material. We show that Kolmogorov turbulence in the eclipsing material with an inner scale of $\sim100$ m and an outer scale of the size of the eclipse region can naturally explain the observation. Our results show that the eclipsing material in such systems can be highly turbulent and suggest that scattering is one of the main eclipsing mechanisms at around 1.4 GHz.

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