arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1812.09673astro-ph.HE
收藏

从能谱和各向异性指示宇宙射线的近源特征

Indication of nearby source signatures of cosmic rays from energy spectra and anisotropies

Wei Liu, Yi-Qing Guo, Qiang Yuan

摘要:

银河系宇宙射线(GCR)的起源在发现一个多世纪后仍然是一个谜。带电粒子在湍流的银河系磁场中的扩散传播使我们无法追溯到它们的加速点。然而,附近的GCR源可能会在本地测量的能量谱和到达方向的各向异性上留下印记。在这项工作中,我们提出了一个简单而自然的描述GCR的生产和传播,在一个两区盘晕扩散的情况下,与附近的源,了解最新的精确测量的能谱和各向异性的GCR。我们发现,在CREAM测量的质子和氦核的能谱以及各种实验检测到的大尺度各向异性中,都出现了一个共同的能量标度$\sim100$ TeV。这些结果表明,一个或多个本地源是非常有可能的重要贡献者GCR低于$100$ TeV。该研究为通过光谱和各向异性测量的联合努力来识别GCR源提供了一种探索。

英文摘要:

The origin of Galactic cosmic rays (GCRs) remains a mystery after more than one century of their discovery. The diffusive propagation of charged particles in the turbulent Galactic magnetic field makes us unable to trace back to their acceleration sites. Nevertheless, nearby GCR source(s) may leave imprints on the locally measured energy spectra and the anisotropies of the arrival direction. In this work we propose a simple but natural description of the GCR production and propagation, within a two-zone disk-halo diffusion scenario together with a nearby source, to understand the up-to-date precise measurements of the energy spectra and anisotropies of GCRs. We find that a common energy scale of $\sim100$ TeV appears in both energy spectra of protons and Helium nuclei measured recently by CREAM and large-scale anisotropies detected by various experiments. These results indicate that one or more local sources are very likely important contributors to GCRs below $100$ TeV. This study provides a probe to identify source(s) of GCRs by means of joint efforts of spectral and anisotropy measurements.

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。

↑