Impact of Galaxy Clusters on the Propagation of Ultrahigh-energy Cosmic Rays

被引：8
作者：
Condorelli, Antonio [1 ]
Biteau, Jonathan [1 ,2 ]
Adam, Remi [3 ]
机构：
[1] Univ Paris Saclay, CNRS, IN2P3, IJCLab, F-91405 Orsay, France
[2] Inst Univ France IUF, Paris, France
[3] Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Nice, France
来源：
ASTROPHYSICAL JOURNAL | 2023年 / 957卷 / 02期
关键词：
LARGE-SCALE STRUCTURE; INTRACLUSTER MEDIUM; ARRIVAL DIRECTIONS; MAGNETIC-FIELD; COMA CLUSTER; SAMPLE; GAS; ANISOTROPY; EVOLUTION; SPECTRA;
D O I：
10.3847/1538-4357/acfeef
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Galaxy clusters are the largest objects in the Universe kept together by gravity. Most of their baryonic content is made of a magnetized diffuse plasma. We investigate the impact of such a magnetized environment on the propagation of ultrahigh-energy cosmic rays (UHECRs). The intracluster medium (ICM) is described according to the self-similar assumption, in which gas density and pressure profiles are fully determined by the cluster mass and redshift. The magnetic field is scaled to the thermal components of the ICM under different assumptions. We model the propagation of UHECRs in the ICM using a modified version of the Monte Carlo code SimProp, where hadronic processes and diffusion in the turbulent magnetic field are implemented. We provide a universal parameterization that approximates the UHECR fluxes escaping from the environment as a function of the most relevant quantities, such as the mass of the cluster, the position of the source with respect to the center of the cluster, and the nature of the accelerated particles. We show that galaxy clusters are an opaque environment, especially for UHECR nuclei. The role of the most massive nearby clusters in the context of the emerging UHECR astronomy is finally discussed.
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页数：8
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