A nearby source of ultra-high energy cosmic rays

被引：2

作者：

Kuznetsov, Mikhail Yu. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Nucl Res, 60th October Anniversary Prospect 7a, Moscow 117312, Russia

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 04期

基金：

俄罗斯科学基金会;

关键词：

ultra high energy cosmic rays; cosmic ray theory;

D O I：

10.1088/1475-7516/2024/04/042

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently the Telescope Array collaboration reported an observation of cosmic ray event with very high energy 244 EeV (2.44 x 10(20) eV). Importantly, the event is hard to correlate with the matter distribution in the local Universe, even after taking into account deflections in magnetic fields. This implies that the event is likely a nucleus with a large charge. An attenuation length of the nucleus of such a high energy in intergalactic space is quite small, therefore its source should be relatively close to our Galaxy. Using these arguments we derive a new upper bound on a distance to the closest ultra -high energy cosmic ray (UHECR) source and a lower bound on the UHECR source number density in general. The distance to the closest source should not exceed 5 Mpc at 95% C.L. and the 95% C.L. lower -bound on the sources number density is rho > 1.0 x 10(-4) Mpc(-3). The number density of UHECR sources emitting heavy nuclei is constrained for the first time.

引用

页数：11

共 29 条

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