乘着合并的星系团的尾流
Riding the wake of a merging galaxy cluster
摘要：
使用WHT OASIS积分场单元观测，我们报告了从Abell 2146中最亮的星系团星系延伸到子星系团X射线冷核心的电离气体薄羽的发现，该子星系团X射线冷核心从BCG偏移约37 kpc。烟羽长度超过15千秒差距，宽度小于3千秒差距。这个羽流的独特之处在于它所在的星系团目前正在经历一次重大的星系团合并。最亮的星系团星系异常地位于X射线激波阵面的后面，并且在冲压压力剥离X射线冷核之后，观察到了最近对BCG破坏的证据。我们研究的气体和恒星的形态，气体运动学的BCG和它们的关系的X射线气体。我们建议，电离气体羽流和偏移X射线冷芯之间的因果关系提供了最简单的解释羽流的形成。BCG和另一个星系团之间的相互作用或合并可能是偏移的原因。
英文摘要：
Using WHT OASIS integral field unit observations, we report the discovery of a thin plume of ionised gas extending from the brightest cluster galaxy in Abell 2146 to the sub-cluster X-ray cool core which is offset from the BCG by ~37 kpc. The plume is greater than 15 kpc long and less than 3 kpc wide. This plume is unique in that the cluster it is situated in is currently undergoing a major galaxy cluster merger. The brightest cluster galaxy is unusually located behind the X-ray shock front and in the wake of the ram pressure stripped X-ray cool core and evidence for recent disruption to the BCG is observed. We examine the gas and stellar morphology, the gas kinematics of the BCG and their relation to the X-ray gas. We propose that a causal link between the ionised gas plume and the offset X-ray cool core provides the simplest explanation for the formation of the plume. An interaction or merger between the BCG and another cluster galaxy is probably the cause of the offset.
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