arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.09191astro-ph.HE
收藏

在大型曝光观测站背景下来自超重暗物质的超高能宇宙射线

Ultra high energy cosmic rays from super-heavy dark matter in the context of large exposure observatories

A. D. Supanitsky, G. Medina-Tanco

摘要:

超高能宇宙射线(UHECR,$E>10^{18}$ eV)的起源至今仍不确定。然而,由于皮埃尔俄歇天文台和望远镜阵列天文台的数据,已经取得了很大的进展。UHECR通量呈现两个主要特征,被称为脚踝的光谱硬化和在较高能量下的抑制。实验数据表明,在脚踝以上的UHECRs流量占主导地位的星系外组成部分的天体物理起源。然而,少数组成部分的外来起源,占主导地位的流量超过抑制仍然是兼容的,与目前的数据。因此,存在一部分UHECR通量来源于星系晕中聚集的超重暗物质粒子衰变的可能性。在这些情况下,主要的贡献来自我们星系的晕。在这篇文章中,识别这些场景的背景下,未来非常大的曝光宇宙射线观测站的可能性进行了研究。值得一提的是,位于附近宇宙的河外晕的贡献也包括在这些研究中。

英文摘要:

The origin of the ultra high energy cosmic rays (UHECRs, $E>10^{18}$ eV) is still uncertain. However, great progress has been achieved due to the data taken by The Pierre Auger and Telescope Array observatories. The UHECR flux presents two main features, a hardening of the spectrum known as the ankle and a suppression at higher energies. The experimental data suggest that above the ankle the UHECRs flux is dominated by an extragalactic component of astrophysical origin. However, a minority component of exotic origin that dominates the flux beyond the suppression is still compatible with current data. Therefore, there exist the possibility that part of the UHECR flux originates from the decay of super-heavy dark matter particles clustered in the halos of the galaxies. In these scenarios the main contribution comes from the halo of our galaxy. In this article the possibility of identifying these scenarios in the context of the future very large exposure cosmic rays observatories is studied. It is worth mentioning that the contribution of the extragalactic halos located in the nearby universe is also included in these studies.

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。

↑