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arXiv 0906.4850astro-ph.HEastro-ph.CO
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超高频ECR到达方向与宇宙大尺度结构的相关性研究

A study of the Correlation of Arrival Directions of UHECRs with the Large Scale Structure of the Universe

Dongsu Ryu, Hyesung Kang, Santabrata Das

摘要:

超高能宇宙射线(UHECR)被认为是源于天体物理源,它应该跟踪宇宙的大尺度结构(LSS)。另一方面,星系际空间(IGMF)中的磁场,它也跟踪宇宙的LSS,偏转带电的UHECR的轨迹,并破坏观测到的UHECR事件与它们的真实源的位置相关性。为了探索这个问题,我们研究了UHE质子通过宇宙磁化LSS的传播的模拟,这在Das等人(2008)中有过报道,其中IGMF是基于湍流发电机模型估计的(Ryu等人,2008)。假设的源被放置在模拟宇宙中的星系团和星系群中,而观察者则位于与本星系群具有相似属性的星系群中。我们计算了模拟UHE质子事件的到达方向与候选源位置之间的角距离的统计。我们比较了我们的模拟与俄歇数据计算的统计。我们讨论了我们的工作对UHECRs来源性质的影响。

英文摘要:

Ultrahigh energy cosmic rays (UHECRs) are believed to originate from astrophysical sources, which should trace the large scale structure (LSS) of the universe. On the other hand, the magnetic field in the intergalactic space (IGMF), which also traces the LSS of the universe, deflects the trajectories of the charged UHECRs and spoils the positional correlation of the observed UHECR events with their true sources. To explore this problem, we studied a simulation of the propagation of UHE protons through the magnetized LSS of the universe, reported earlier in Das et al. (2008), in which the IGMF was estimated based on a turbulence dynamo model (Ryu et al. 2008). Hypothetical sources were placed inside clusters and groups of galaxies in the simulated universe, while observers were located inside groups of galaxies that have similar properties as the Local Group. We calculated the statistics of the angular distance between the arrival directions of simulated UHE proton events and the positions of candidate sources in our simulation. We compared the statistics from our simulation with those calculated with the Auger data. We discussed the implication of our works on the nature of the sources of UHECRs.

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。

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