论文标题
脉冲星探测的非额外星际密度光谱
Nonuniversal interstellar density spectra probed by pulsars
论文作者
论文摘要
银河系湍流会影响密度分布和恒星形成。我们引入了一种新的方法，通过使用大量脉冲星样品的分散度量（DM）来测量星际湍流密度光谱。在不需要多个示踪剂的情况下，我们在多个长度尺度的不同范围内获得多相星际介质中的非美度密度光谱。通过比较DMS的分析结构与在天空的不同区域中测量的分析结构功能，我们发现了由冷星际阶段的超音速湍流引起的浅密度光谱，以及在扩散温暖的电离培养基（WIM）中的kolmogorov样密度谱。两种光谱都延伸到数百个PC。在较大的尺度上，我们首次确定散布的WIM中陡峭的密度光谱，该光谱延伸到多个KPC。我们的结果表明，脉冲星的DMS可以提供有关星际湍流的独特新信息。
The Galactic interstellar turbulence affects the density distribution and star formation. We introduce a new method of measuring interstellar turbulent density spectra by using the dispersion measures (DMs) of a large sample of pulsars. Without the need of invoking multiple tracers, we obtain nonuniversal density spectra in the multi-phase interstellar medium over different ranges of length scales. By comparing the analytical structure function of DMs with the observationally measured one in different areas of sky, we find a shallow density spectrum arising from the supersonic turbulence in cold interstellar phases, and a Kolmogorov-like density spectrum in the diffuse warm ionized medium (WIM). Both spectra extend up to hundreds of pc. On larger scales, we for the first time identify a steep density spectrum in the diffuse WIM extending up to several kpc. Our results show that the DMs of pulsars can provide unique new information on the interstellar turbulence.
