余恒,
北京师范大学天文系， 100875，北京
详细信息
通讯作者:余恒（1982—），男，博士，副教授. 研究方向：星系团、宇宙学. E-mail：yuheng@bnu.edu.cn
中图分类号:P157.8计量
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被引次数:0
出版历程
收稿日期:2020-03-25
网络出版日期:2021-01-21
刊出日期:2021-05-08
On merging galaxy cluster MACS J0358.8-2955
Lei WANG,Heng YU,
Department of Astronomy, Beijing Normal University, 100875, Beijing, China
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摘要
摘要:尝试用最新的方法重新分析并合星系团MACS J0358.8-2955，给出并合事件的更多细节：在光学波段，采用花树算法寻找星系团子结构，确认了2个子结构的存在，并给出了具体成员；在X 射线波段，通过X射线光谱拟合，得到星系团内介质的红移分布，既给出了X射线气体与光学星系关联的直接证据，也呈现出2个子团的接近路径；ClusterPyXT工具生成的高分辨率温度图还揭示了周围环境中的激波加热信号，给出了并合成分的运动轨迹．新方法提供的光学星系和热气体的视向速度运动信息，较好地补充了星系团MACSJ0358并合过程的已有认识，构建出一个完整的并合早期三维图景．
关键词:星系团/
星系/
X射线/
星系团内介质
Abstract:As a merging galaxy cluster with a large velocity component in the line of sight, MACS J0358.8-2955 provides an important sample for studying the dynamical structure of galaxy clusters．In this article the data of this regiment were re-analyzed with the latest methods to confirm specific stage of this merger event．In the optical band, we adopt the blooming tree technique to identify substructures and find unambiguous galaxy members of its two merging components．Archived data from Chandra X-ray telescope were analyzed, to obtain redshift information of intra-cluster medium by X-ray spectrum fitting, to not only give direct evidence of relationship between X-ray gas and optical galaxies, but also to show the approach path of the two substructures．High-resolution temperature map generated with ClusterPyXT tool revealed shock heating signal in the surrounding environment, giving a motion trajectory of the merger event．The present work provides information on apparent velocity of optical galaxies and hot gas, complements existing knowledge on the merging process of galaxy cluster MACSJ0358, and obtains a 3D picture of early merger event．
Key words:galaxy clusters/
galaxies/
X-rays/
intracluster medium
