通过低频无线电发射探索磁化宇宙网
Exploring the magnetized cosmic web through low frequency radio emission
摘要：
最近低频射电望远镜能力的改进为研究宇宙网的热和非热特性提供了一个独特的机会。我们认为，从巨大的射电遗迹的扩散，极化发射痕迹结构形成冲击波和照明的大规模磁场。为了证明这一点，我们在高分辨率的宇宙学模拟的星系团的冲击加速相对论电子的人口模型，并计算由此产生的无线电同步辐射。我们发现，个别冲击波对应于无线电表面亮度图，使我们能够测量这些冲击的马赫数本地化的峰值。我们发现遗迹的光度和计数强烈地依赖于磁场性质、团簇质量和动力学状态。通过适当地结合不同的集群数据，包括法拉第旋转措施，我们能够约束等离子体的一些宏观参数的结构形成冲击，如湍流模型。我们还预测了温热星系际介质的性质的上限，如它的温度和密度。我们预测，目前这一代的射电望远镜（LOFAR，GMRT，MWA，LWA）有可能发现一个更大的样本的射电遗迹，与多个遗迹预计每个剧烈合并集群。未来的实验（SKA）将使我们能够进一步探测团簇中等离子体物理的宏观参数。
英文摘要：
Recent improvements in the capabilities of low frequency radio telescopes provide a unique opportunity to study thermal and non-thermal properties of the cosmic web. We argue that the diffuse, polarized emission from giant radio relics traces structure formation shock waves and illuminates the large-scale magnetic field. To show this, we model the population of shock-accelerated relativistic electrons in high-resolution cosmological simulations of galaxy clusters and calculate the resulting radio synchrotron emission. We find that individual shock waves correspond to localized peaks in the radio surface brightness map which enables us to measure Mach numbers for these shocks. We show that the luminosities and number counts of the relics strongly depend on the magnetic field properties, the cluster mass and dynamical state. By suitably combining different cluster data, including Faraday rotation measures, we are able to constrain some macroscopic parameters of the plasma at the structure formation shocks, such as models of turbulence. We also predict upper limits for the properties of the warm-hot intergalactic medium, such as its temperature and density. We predict that the current generation of radio telescopes (LOFAR, GMRT, MWA, LWA) have the potential to discover a substantially larger sample of radio relics, with multiple relics expected for each violently merging cluster. Future experiments (SKA) should enable us to further probe the macroscopic parameters of plasma physics in clusters.
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。
