Cosmic Rays in Galaxy Clusters and Their Interaction with Magnetic Fields

Cosmic Rays in Galaxy Clusters and Their Interaction with Magnetic Fields
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星系团中的宇宙射线及其与磁场的相互作用

DOI:
10.1007/978-3-662-44625-6_20
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发表时间:
2015
期刊:
arXiv: High Energy Astrophysical Phenomena
影响因子:
--
通讯作者:
T. Jones
T. Jones
中科院分区:
--
文献类型:
--
作者:
G. Brunetti;T. Jones

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宇宙射线可以通过不同的机制在星系团中被加速,并在宇宙学时间内被限制在聚集的星系团体积中。预计这一部件将通过各种机制产生从无线电到γ射线的非热辐射。来自星系间介质的百万分之一量级的同步辐射现在在许多邻近的大质量星系团中被观测到,它为星系团中热气体、磁场和宇宙射线之间复杂的相互作用提供了一个探测器。宇宙射线与磁场的相互作用对这些粒子的加速、演化和动力学至关重要。宇宙射线被捕获和加速,通过散射与磁场波动在收敛(冲击)或湍流驱动,至少部分地,由集群形成的分层过程。有趣的是,这也将团簇形成过程和团簇内介质中的粒子加速过程联系起来。在这一章中,我们描述了星系团中宇宙射线物理学的基本成分,并报告了目前用于限制其起源和演化的最相关的观测值。
Cosmic rays can be accelerated in galaxy clusters by different mechanisms and remain confined in the cluster volume accumulating for cosmological times. This component is expected to generate non-thermal radiation from radio to γ-rays through a variety of mechanisms. Mpc-scale synchrotron radiation from the inter-galactic-medium is nowadays observed in many nearby, massive, clusters and provides a probe of the complex interplay between thermal gas, magnetic fields and cosmic rays in galaxy clusters. The interaction of cosmic rays with magnetic fields is of primary importance for the acceleration, evolution and dynamics of these particles. Cosmic rays are trapped and accelerated via the scattering with magnetic field fluctuations in converging (shocks) or turbulent flows driven, at least in part, by the hierarchical process of clusters formation. Interestingly, this also connects the processes of cluster formation and particle acceleration in the intra-cluster-medium. In this chapter we describe the basic ingredients of the physics of cosmic rays in galaxy clusters and report on the most relevant observables that are nowadays used for constraining their origin and evolution.
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