论文标题
用快速无线电爆发探测播出的湍流
Probing the intergalactic turbulence with fast radio bursts
论文作者
论文摘要
弥漫性间层状培养基（IGM）的湍流在宇宙时间的各种天体物理过程中起着重要作用，但是在观察和数值上限制其统计特性非常具有挑战性。通过沿不同视线沿不同视线的湍流朝向快速无线电爆发（FRB）的统计分析，我们证明了FRB提供了一种独特的工具来探测播层间湍流。我们测量FRB的分散度度量（DMS）的结构功能（SF），以研究由白术湍流引起的多尺度电子密度波动。 SF具有较大的振幅和具有角度分离的Kolmogorov幂律缩放，显示了在一系列长度范围内的大且相关的DM波动。鉴于FRB的DMS是IgM主导的，我们的结果暂时表明，播层湍流具有kolmogorov功率谱和外部尺度，其订单为$ 100 $ MPC。
The turbulence in the diffuse intergalactic medium (IGM) plays an important role in various astrophysical processes across cosmic time, but it is very challenging to constrain its statistical properties both observationally and numerically. Via the statistical analysis of turbulence along different sightlines toward a population of fast radio bursts (FRBs), we demonstrate that FRBs provide a unique tool to probe the intergalactic turbulence. We measure the structure function (SF) of dispersion measures (DMs) of FRBs to study the multi-scale electron density fluctuations induced by the intergalactic turbulence. The SF has a large amplitude and a Kolmogorov power-law scaling with angular separations, showing large and correlated DM fluctuations over a range of length scales. Given that the DMs of FRBs are IGM dominated, our result tentatively suggests that the intergalactic turbulence has a Kolmogorov power spectrum and an outer scale on the order of $100$ Mpc.
