标题： Suzaku对星系团1RXS J0603.3+4214的观测：“梳子”射电遗迹中粒子加速过程的含义 显示英文标题

标题： Suzaku Observations of the Galaxy Cluster 1RXS J0603.3+4214: Implications of Particle Acceleration Processes in "Toothbrush" Radio Relic

摘要： 我们展示了对具有“牙刷”射电遗迹的星系团1RXS J0603.3+4214的Suzaku观测结果。尽管从射电观测预计在遗迹外缘存在马赫数为$M \simeq 4$的激波，但我们的星系团介质温度测量显示的温度差异比预期的要弱。从遗迹外缘的温度差异估计的马赫数为$M \simeq 1.5$，即使考虑到统计和系统误差，也明显低于从射电数据估计的值。这表明，通常用于将射电光谱指数与马赫数联系起来的线性测试粒子情况下的扩散激波加速理论不适用于这个遗迹。我们还测量了遗迹西部分的温度差异，从XMM-Newton数据的X射线表面亮度分析中推测该处存在马赫数为$M \simeq 1.6$的激波，并以独立的方式得到了一致的结果。我们在遗迹区域搜索了非热逆康普顿成分，结果在0.3-10 keV波段的通量上限为$2.4 \times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$。 磁场强度的下限变为1.6 $\mu$G，这意味着磁能密度可能超过热能的几个 $\% $。 显示英文摘要

摘要： We present the results of Suzaku observations of the galaxy cluster 1RXS J0603.3+4214 with "toothbrush" radio relic. Although a shock with Mach number $M \simeq 4$ is expected at the outer edge of the relic from the radio observation, our temperature measurements of the intracluster medium indicate a weaker temperature difference than what is expected. The Mach number estimated from the temperature difference at the outer edge of the relic is $M \simeq 1.5$, which is significantly lower than the value estimated from the radio data even considering both statistical and systematic errors. This suggests that a diffusive shock acceleration theory in the linear test particle regime, which is commonly used to link the radio spectral index to the Mach number, is invalid for this relic. We also measured the temperature difference across the western part of the relic, where a shock with $M \simeq 1.6$ is suggested from the X-ray surface brightness analysis of the XMM-Newton data, and obtained consistent results in an independent way. We searched for the non-thermal inverse Compton component in the relic region and the resultant upper limit on the flux is $2.4 \times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$ in the 0.3-10 keV band. The lower limit of the magnetic field strength becomes 1.6 $\mu$G, which means that magnetic energy density could be more than a few $\% $ of the thermal energy.