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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Discovery of gas bulk motion in the galaxy cluster Abell 2256 with Suzaku
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Discovery of gas bulk motion in the galaxy cluster Abell 2256 with Suzaku

机译：在朱雀与银河团Abell 2256中发现气体大量运动

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摘要

The results from Suzaku observations of the galaxy cluster Abell 2256 are presented. This cluster is a prototypical and well-studied merging system, exhibiting substructures both in the X-ray surface brightness and in the radial velocity distribution of member galaxies. There are main and sub components separated by 3:05 in the sky and by about 2000km s ~(-1) in radial-velocity peaks of the member galaxies. In order to measure the Doppler shifts of iron K-shell lines from the two gas components by the Suzaku XIS, the energy scale of the instrument was carefully evaluated and found to be calibrated well. A significant shift of the radial velocity of the sub component gas with respect to that of the main cluster was detected. All three XIS sensors show the shift independently and consistently among the three. The difference is found to be 1500±300 (statistical) ±300 (systematic) kms ~(-1). The X-ray determined absolute redshifts of, and hence the difference between, the main and sub components are consistent with those of member galaxies in the optical band. The observation indicates robustly that the X-ray emitting gas is moving together with galaxies as a substructure within the cluster. These results along with other X-ray observations of gas bulk motions in merging clusters are discussed.
机译：给出了朱雀对星系团Abell 2256的观测结果。这个星团是一个典型的和经过充分研究的合并系统，在X射线表面亮度和成员星系的径向速度分布中都显示出子结构。在天空中，主要和次要部分之间的距离为3:05，成员星系的径向速度峰值之间的距离约为2000km s〜（-1）。为了通过Suzaku XIS测量来自两种气体组分的铁K壳线的多普勒频移，仔细评估了仪器的能量规模，并进行了很好的校准。检测到子组分气体的径向速度相对于主簇的径向速度有明显变化。所有三个XIS传感器在三个传感器之间均独立且一致地显示出位移。发现差异为1500±300（统计）±300（系统）kms〜（-1）。 X射线确定的主分量和子分量的绝对红移以及由此引起的差异与光学波段中成员星系的绝对红移一致。观察结果有力地表明，发射X射线的气体正与星系一起移动，作为星团内部的子结构。讨论了这些结果以及合并星团中气体体积运动的其他X射线观察结果。

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