论文标题
绝热压缩方案的应用到Galaxy群集Abell 3411-3412中的无线电遗物
The application of the adiabatic compression scenario to the radio relic in the galaxy cluster Abell 3411-3412
论文作者
论文摘要
尽管无线电遗物被认为是由合并冲击引起的簇内冲击波，这是用于描述冲击阵线的（重新）加速过程的最广泛使用的模型，但扩散的冲击加速器（DSA）模型有几个挑战，其中包括在低震动计数下效率低的事实。鉴于这些挑战，值得考虑替代机制。一种可能性是由残留化石电子种群的冲击波绝热压缩，该射线射流射流射流射流射流。本文将该模型应用于合并星系集群Abell 3411-3412中的遗物，其中已经观察到了遗物和射电星系之间的无线电桥，目的是重现遗物的光谱指数的空间结构。提出了四种情况，其中研究了不同的效果，例如冲击前后的效果和不同的冲击强度。结果表明，绝热压缩模型可以重现整个遗物上观察到的光谱指数的冲击马赫数，该遗物的值低于该遗物的DSA型建模所需的值，并且与X射线观测值衍生的值（例如其他机制，例如扩展阶段或后震动后的湍流前方，有效的震动前方，均与X射线观测值相符。
Although radio relics are understood to originate in intracluster shock waves resulting from merger shocks, the most widely used model for describing this (re-)acceleration process at shock fronts, the diffusive shock acceleration (DSA) model, has several challenges, including the fact that it is inefficient at low shock Mach numbers. In light of these challenges, it is worthwhile to consider alternative mechanisms. One possibility is the adiabatic compression by a shock wave of a residual fossil electron population which has been left over from a radio galaxy jet. This paper applies this model to the relic hosted in the merging galaxy cluster Abell 3411-3412, where a radio bridge between the relic and a radio galaxy has been observed, with the aim to reproduce the spatial structure of the spectral index of the relic. Four scenarios are presented, in which different effects are investigated, such as effects behind the shock front and different shock strengths. The results show that the adiabatic compression model can reproduce the observed spectral indices across the relic for a shock Mach number that is lower than the value required by the DSA-type modelling of this relic and is in accordance with the values derived from X-ray observations, if other mechanisms, such as an expansion phase or post-shock turbulence, are effective behind the shock front.
