arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0710.0767astro-ph
收藏

超高能cosmic ray源结构分布的研究

Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources

Hajime Takami, Katsuhiko Sato

摘要:

我们研究了超高能宇宙射线(UHECR)的近期观测是否可以揭示其局部源分布,如果它们的起源是天体物理对象,它反映了所观察到的局部结构。为了讨论这种可能性,我们计算UHE质子的到达分布,考虑到它们在星系际空间的传播过程,即能量损失和偏转的河外磁场(EGMF)。对于一个现实的模拟,我们构建并采用了一个结构化的EGMF和UHECR源分布的模型,再现了银河系周围实际观察到的局部结构。利用相关系数将到达分布与它们的源分布进行统计比较。我们特别发现,$10^{19.8}$ eV以上的超高能电子回旋共振是最好的指标,以破译其源分布在100 Mpc,和检测约500个事件的所有天空允许我们揭示的本地结构的UHE宇宙合理的EGMF强度和源数密度。这一数量的事件可以通过皮埃尔俄歇天文台五年的观测来检测。

英文摘要:

We investigate the possibility that near future observations of ultra-high-energy cosmic rays (UHECRs) can unveil their local source distribution, which reflects the observed local structures if their origins are astrophysical objects. In order to discuss this possibility, we calculate the arrival distribution of UHE protons taking into account their propagation process in intergalactic space i.e. energy losses and deflections by extragalactic magnetic field (EGMF). For a realistic simulation, we construct and adopt a model of a structured EGMF and UHECR source distribution, which reproduce the local structures actually observed around the Milky Way. The arrival distribution is compared statistically to their source distribution using correlation coefficient. We specially find that UHECRs above $10^{19.8}$eV are best indicators to decipher their source distribution within 100 Mpc, and detection of about 500 events on all the sky allows us to unveil the local structure of UHE universe for plausible EGMF strength and the source number density. This number of events can be detected by five years observation by Pierre Auger Observatory.

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。

↑