论文标题
DM功率：用于高精度色散度量的算法，并应用于快速无线电爆发
DM-power: an algorithm for high precision dispersion measure with application to fast radio bursts
论文作者
论文摘要
我们提出了DM-Power，这是一种精确确定无线电爆发的色散度量（DM）的新方法，并将其应用于快速无线电爆发（FRB）FRB 〜20180916b。 DM-Power在FRB中看到的多个时间尺度上的复杂结构的启发，通过在突发的功率谱中的多个傅立叶频率组合测量，从而优化了DM。通过在每个傅立叶频率下进行最佳加权测量值，DM-Power找到了一个爆发DM，可以有效地包含许多不同的爆发时间表。我们在模拟高斯脉冲轮廓上验证了该技术，其精度降低至$σ_ {\ rm dm} \ sim 0.001〜 {\ rm pc〜cm}^{ - 3} $，然后将其应用于Pulsar B0329+54和FRB 〜2018099161b。这些DM测量值的精度足以测量$ \ 2 $ HR跨度的DM统计学意义变化。尽管这种变化可能是沿视线沿线的电子密度变化的结果，但更像是，观察到的变化是固有的频率依赖性爆发结构的结果，可以模仿分散延迟。
We present DM-power, a new method for precisely determining the dispersion measure (DM) of radio bursts, and apply it to the Fast Radio Burst (FRB) source FRB~20180916B. Motivated by the complex structure on multiple time scales seen in FRBs, DM-power optimizes the DM by combining measurements at multiple Fourier frequencies in the power spectrum of the burst. By optimally weighting the measurements at each Fourier frequency, DM-power finds a burst DM that effectively incorporates information on many different burst timescales. We validate this technique on simulated Gaussian pulse profiles with a precision down to $σ_{\rm DM} \sim 0.001~{\rm pc~cm}^{-3}$, and then apply it to bursts from pulsar B0329+54 and FRB~20180916B. The precision of these DM measurements are sufficient to measure a statistically significant variation in DM over a $\approx 2$ hr span. While this variation could be the result of electron density variations along the line of sight, it is more like that the observed variation is the result of intrinsic frequency-dependent burst structure that can mimic a dispersive delay.
