论文标题
基于Sunyaev-Zel'Dovich效应的相对论动力学理论的经验检验
Empirical test for relativistic kinetic theories based on the Sunyaev-Zel'dovich effect
论文作者
论文摘要
我们提出了一种新方法，以根据Sunyaev-Zel'Dovich（SZ）效应的频率依赖性来确定星系内气体（ICG）中的电子速度（EV）分布函数。人们普遍认为，相对论EV分布是Juttner建议的分布。但是，关于相对论动力学理论的基础，还有一场持续的辩论，也提出了其他分布。中等程度的群内气体（ICG）提供了一个独特的实验室，以测试相对论动力学理论。我们进行了蒙特卡洛模拟，以假设juttner eV分布假设几％误差，从单个温度气体产生SZ信号。我们拟合了基于非权威主义的麦克斯威尔语及其两个相对论概括的SZ模型，即Juttner和修改后的Juttner分布。我们发现，SZ信号中有1％的误差足以根据其不同最佳拟合温度来区分这些具有很高意义的分布。但是，在集群中的任何LOS中，ICG都包含一系列温度。使用合并星系群集的N体/流体动力学模拟，并通过LOS在LOS的SZ测量中通过Bow Shock在SZ测量中有1％的误差，我们发现可以区分Juttner和改良的Juttner分布，具有很高的意义。我们的结果表明，假设使用其他观测值获得的同一集群中的同一群集中，将ICG温度从拟合到SZ数据衍生为SZ数据，将使我们能够区分不同的分布。
We propose a new method to determine the electron velocity (EV) distribution function in the intracluster gas (ICG) in clusters of galaxies based on the frequency dependence of the Sunyaev-Zel'dovich (SZ) effect. It is generally accepted that the relativistic equilibrium EV distribution is the one suggested by Juttner. However, there is an ongoing debate on the foundation of relativistic kinetic theory, and other distributions have also been proposed. The mildly relativistic intracluster gas (ICG) provides a unique laboratory to test relativistic kinetic theories. We carried out Monte Carlo simulations to generate SZ signal from a single-temperature gas assuming the Juttner EV distribution assuming a few per cent errors. We fitted SZ models based on non-relativistic Maxwellian, and its two relativistic generalizations, the Juttner and modified Juttner distributions. We found that a 1% error in the SZ signal is sufficient to distinguish between these distributions with high significance based on their different best-fit temperatures. However, in any LOS in a cluster, the ICG contains a range of temperatures. Using our N-body/hydrodynamical simulation of a merging galaxy cluster and assuming a 1% error in the SZ measurements in a LOS through a bow shock, we find that it is possible to distinguish between Juttner and modified Juttner distributions with high significance. Our results suggest that deriving ICG temperatures from fitting to SZ data assuming different EV distribution functions and comparing them to the temperature in the same cluster obtained using other observations would enable us to distinguish between the different distributions.11 pages, 8 figures, and 1 table, accepted for publication in the Astrophysical Journal
