Title: A Strong Merger Shock in Abell 665 Show Chinese title

Title: 阿贝尓665中的强合并激波

Abstract: Deep (103 ks) \chandra\ observations of Abell 665 have revealed rich structures in this merging galaxy cluster, including a strong shock and two cold fronts. The newly discovered shock has a Mach number of $M$ = 3.0 $\pm$ 0.6, propagating in front of a cold disrupted cloud. This makes Abell~665 the second cluster where a strong merger shock of $M \approx$ 3 has been detected, after the Bullet cluster. The shock velocity from jump conditions is consistent with (2.7 $\pm$ 0.7) $\times$ 10$^3$ km sec$^{-1}$. The new data also reveal a prominent southern cold front, with potentially heated gas ahead of it. Abell 665 also hosts a giant radio halo. There is a hint of diffuse radio emission extending to the shock at the north, which needs to be examined with better radio data. This new strong shock provides a great opportunity to study the re-acceleration model with the X-ray and radio data combined. Show Chinese abstract

Abstract: 深度（103 ks）\chandra 观测显示了阿贝尔665中丰富的结构，包括一个强烈的激波和两个冷前缘。新发现的激波具有马赫数$M$ = 3.0$\pm$0.6，在一个被破坏的冷云前方传播。这使得阿贝尔665成为继子弹星系团之后第二个检测到$M \approx$ 3 强合并激波的星系团。 从跃迁条件得到的冲击速度与(2.7$\pm$0.7)$\times$10$^3$km sec$^{-1}$一致。 新数据还揭示了一个显著的南方冷前缘，其前方可能有被加热的气体。 阿贝尔 665 还拥有一个巨大的射电晕。 在北方的冲击处有扩散射电辐射的迹象，需要通过更好的射电数据进行检查。 这个新的强冲击为结合X射线和射电数据研究再加速模型提供了很好的机会。