X-ray study of the double radio relic Abell 3376 with Suzaku
X-ray study of the double radio relic Abell 3376 with Suzaku
复制标题
用朱雀对双射电文物 Abell 3376 进行 X 射线研究
DOI：
10.1051/0004-6361/201732496
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发表时间：
2018
影响因子：
6.5
通讯作者：
H. Kawahara
中科院分区：
文献类型：
--
作者：
I. Urdampilleta;H. Akamatsu;F. Mernier;J. S. Kaastra;J. de Plaa;T. Ohashi;Y. Ishisaki;H. Kawahara
我们给出了附近的双射电遗迹合并星系团Abell3376(z=0.046)的X射线光谱分析，这是用SuzakuXIS仪器观测的。这些深度(∼360k)观测覆盖了该星系团外围的整个双遗迹区域。这些弥漫的射电结构是在合并星系团中结合大规模X射线冲击观察到的最大的弧形遗迹之一。我们确认存在一个更强的地震(ℳW=2.8W±10.4)在ATR∼ 26‘的西侧，这是由于整个射电遗迹的温度和表面亮度不连续造成的。在东部，我们检测到一次较弱的地震(ℳE=1.5o±0.1atr∼ 8‘)，可能与东部遗迹的“凹坑”有关，以及一次冷锋atr∼ 3’。根据马赫数计算的激波速度，我们估计激波锋在核通过后的动力学年龄为∼0.6Gyr，表明Abell3376仍然是一个演化中的合并星系团，合并发生在天空平面附近。这些结果与文献中的模拟、光学和弱透镜研究是一致的。
We present an X-ray spectral analysis of the nearby double radio relic merging cluster Abell 3376 (z= 0.046), observed with theSuzakuXIS instrument. These deep (∼360 ks) observations cover the entire double relic region in the outskirts of the cluster. These diffuse radio structures are amongst the largest and arc-shaped relics observed in combination with large-scale X-ray shocks in a merging cluster. We confirm the presence of a stronger shock (ℳW= 2.8 ± 0.4) in the western direction atr∼ 26′, derived from a temperature and surface brightness discontinuity across the radio relic. In the east, we detect a weaker shock (ℳE= 1.5 ± 0.1) atr∼ 8′, possibly associated with the “notch” of the eastern relic, and a cold front atr∼ 3′. Based on the shock speed calculated from the Mach numbers, we estimate that the dynamical age of the shock front is ∼0.6 Gyr after core passage, indicating that Abell 3376 is still an evolving merging cluster and that the merger is taking place close to the plane of the sky. These results are consistent with simulations and optical and weak lensing studies from the literature.