PARTICLE ACCELERATION AND NON-THERMAL EMISSION FROM GALAXY CLUSTERS
PARTICLE ACCELERATION AND NON-THERMAL EMISSION FROM GALAXY CLUSTERS
复制标题
星系团的粒子加速和非热发射
DOI：
10.5303/jkas.2004.37.5.493
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发表时间：
2004
影响因子：
1
通讯作者：
G. Brunetti
中科院分区：
文献类型：
--
作者：
G. Brunetti
星系团中非热现象的存在和程度现在已经得到了充分的证实。我们理解这些现象的一个关键问题是相对论电子的起源，而相对论电子的起源可能受到射电晕精细射电性质及其统计模型的制约。在这篇文章中，我们认为目前的数据支持这样一种情况，即星系团内介质(ICM)中发射的电子在离开时被就地重新加速。给出了湍流粒子加速模型的概述，重点介绍了最近的与时间相关的计算，其中包括粒子与MHD波的完全耦合。
The existence and extent of non-thermal phenomena in galaxy clusters is now well established. A key question in our understanding of these phenomena is the origin of the relativistic electrons which may be constrained by the modelling of the fine radio properties of radio halos and of their statistics. In this paper we argue that present data favour a scenario in which the emitting electrons in the intracluster medium (ICM) are reaccelerated in situ on their way out. An overview of turbulent-particle acceleration models is given focussing on recent time-dependent calculations which include a full coupling between particles and MHD waves.