论文标题
模拟宇宙网的多波长互相关分析
Multi wavelength cross-correlation analysis of the simulated cosmic web
论文作者
论文摘要
我们使用磁静脉动力学宇宙学模拟来研究不同可观察到的不同可观察结果（即X射线发射，Sunyaev-Zeldovich信号在21 cm处，HI温度降低，弥漫性同步加速器发射和Faraday旋转）作为cosmic Web中差异问题的探针。我们采用统一和简单的方法在各种波长下产生合成观测，并比较可观察到的不同组合的检测机会彼此相关，并且与体积中的基本星系分布相关。通过目前可用的星系和现有仪器调查，检测光环外宇宙网络中弥漫性气体的最佳机会是通过与Sunyaev-Zeldovich观测值交叉相交星系的分布。我们还发现，星系网络与无线电发射或法拉第旋转之间的互相关已可以用于限制外那层次磁场的振幅，远离现有无线电观察结果的群集体积之外，并探测宇宙磁性的起源，并随着未来的无线电传播而探索。
We used magneto-hydrodynamical cosmological simulations to investigate the cross-correlation between different observables (i.e. X-ray emission, Sunyaev-Zeldovich signal at 21 cm, HI temperature decrement, diffuse synchrotron emission and Faraday Rotation) as a probe of the diffuse matter distribution in the cosmic web. We adopt an uniform and simplistic approach to produce synthetic observations at various wavelengths, and we compare the detection chances of different combinations of observables correlated with each other and with the underlying galaxy distribution in the volume. With presently available surveys of galaxies and existing instruments, the best chances to detect the diffuse gas in the cosmic web outside of halos is by cross-correlating the distribution of galaxies with Sunyaev-Zeldovich observations. We also find that the cross-correlation between the galaxy network and the radio emission or the Faraday Rotation can already be used to limit the amplitude of extragalactic magnetic fields, well outside of the cluster volume usually explored by existing radio observations, and to probe the origin of cosmic magnetism with the future generation of radio surveys.
