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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Discovery of a nearby early-phase major cluster merger CIZA J1358.9-4750
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Discovery of a nearby early-phase major cluster merger CIZA J1358.9-4750

机译：发现附近的早期大型集群合并CIZA J1358.9-4750

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CIZA J1358.9-4750 is a nearby (z = 0.074) pair of clusters of galaxies located close to the Galactic plane. It consists of two X-ray extended humps at the northwest and the southeast separated by 14' (similar to 1.2 Mpc), and an X-ray bright bridgelike structure in between. With Suzaku, the southeast hump was shown to have a temperature of 5.6 +/- 0.2 keV and the northwest one 4.6 +/- 0.2 keV. Neither hump exhibits significant central cool components. The bridge region has a temperature higher than 9 keV at the maximum, and this hot region is distributed almost perpendicular to the bridge axis, in agreement with the shock heating seen in numerical simulations at an early phase of a head-on major merger. This resemblance is supported by good positional coincidence between the X-ray peaks and cD galaxies associated with each cluster. In a short exposure XMM-Newton image, a significant intensity jump was found at a position where the Suzaku-measured temperature exhibits a steep gradient. These properties indicate the presence of a shock discontinuity. The Mach number is estimated to be 1.32 +/- 0.22 from the temperature difference across the identified shock front, which gives a colliding velocity of approximately 1800 km s(-1). From optical redshifts of the member galaxies, the two clusters are indicated to be merging nearly on the sky plane. Thus, CIZA J1358.9-4750 is considered as a valuable nearby example of early-phase merger with a clear shock feature.
机译：CIZA J1358.9-4750是位于银河系平面附近的附近一对（z = 0.074）星系簇。它由西北和东南的两个X射线扩展驼峰组成，它们之间相距14'（类似于1.2 Mpc），并且它们之间是X射线明亮的桥状结构。对于朱雀，东南峰的温度为5.6 +/- 0.2 keV，西北峰的温度为4.6 +/- 0.2 keV。两种驼峰都没有表现出明显的中央冷却成分。桥区的最高温度最高为9 keV，并且该热区几乎垂直于桥轴分布，这与正面大合并初期在数值模拟中看到的冲击加热相符。 X射线峰和与每个星团相关的cD星系之间的良好位置重合支持了这种相似性。在短曝光XMM-牛顿图像中，在朱雀测量的温度呈现陡峭梯度的位置发现了明显的强度跳跃。这些性质表明存在冲击不连续性。根据确定的激波前沿的温差，马赫数估计为1.32 +/- 0.22，这使碰撞速度约为1800 km s（-1）。从成员星系的光学红移来看，这两个星团几乎都在天空平面上合并。因此，CIZA J1358.9-4750被认为是早期合并的有价值的示例，具有明显的震撼功能。

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