Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku
Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku
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DOI：
10.1093/pasj/65.1.16
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发表时间：
2011-12
影响因子：
2.3
通讯作者：
H. Akamatsu;H. Kawahara
中科院分区：
文献类型：
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作者：
H. Akamatsu;H. Kawahara
我们使用Suzaku卫星对四个星系团中的六个巨大无线电遗迹进行了系统的x射线分析。样本包括CIZA 2242.8-5301、Zwcl 2341.1-0000、Abell 3667的东南部以及之前公布的Abell 3667和Abell 3376西北部的结果。特别是我们首次利用Suzaku卫星观测到CIZA 2242.8-5301的狭窄（50 kpc）遗迹，使我们能够减少投影效应。我们报道了在CIZA2242.8-5301和Abell 3667 SE遗迹位置的x射线检测。在ZWCL2341.1-0000中两个遗迹的位置，我们没有检测到冲击。通过光谱温度分布，我们发现CIZA 2242.8-5301、Abell 3376、Abell 3667NW和Abell 3667SE的温度分布在遗迹之间有明显的跳跃。我们使用Rankine-Hugoniot跳变条件从x射线温度或压力剖面估计马赫数，并将其与无线电频谱指数得出的马赫数进行比较。所得的马赫数（M=1.5-3）几乎一致，而x射线数据得出的CIZA2242马赫数趋于低于射电观测结果。这些结果表明，合并星团中的巨大射电遗迹与激波结构有关，正如先前对单个星团的研究所表明的那样。
We perform a systematic X-ray analysis of six giant radio relics in four clusters of galaxies using the Suzaku satellite. The sample includes CIZA 2242.8-5301, Zwcl 2341.1-0000, the South-East part of Abell 3667 and previously published results of the North-West part of Abell 3667 and Abell 3376. Especially we first observed the narrow (50 kpc) relic of CIZA 2242.8-5301 by Suzaku satellite, which enable us to reduce the projection effect. We report X-ray detections of shocks at the position of the relics in CIZA2242.8-5301 and Abell 3667 SE. At the position of the two relics in ZWCL2341.1-0000, we do not detect shocks. From the spectroscopic temperature profiles across the relic, we find that the temperature profiles exhibit significant jumps across the relics for CIZA 2242.8-5301, Abell 3376, Abell 3667NW, and Abell 3667SE. We estimated the Mach number from the X-ray temperature or pressure profile using the Rankine-Hugoniot jump condition and compared it with the Mach number derived from the radio spectral index. The resulting Mach numbers (M=1.5-3) are almost consistent with each other, while the Mach number of CIZA2242 derived from the X-ray data tends to be lower than that of the radio observation. These results indicate that the giant radio relics in merging clusters are related to the shock structure, as suggested by previous studies of individual clusters.