doi:10.12202/j.0476-0301.2021025刘登琦,
余恒^,
北京师范大学天文系，100875，北京
基金项目:国家自然科学基金资助项目（U1731243）；中科院国际合作局项目（GJHZ1864）

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

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出版历程

收稿日期:2021-01-29
网络出版日期:2021-07-06
刊出日期:2021-06-30

Galaxy evolution in substructures of A2142

Dengqi LIU,
Heng YU^,
Department of Astronomy, Beijing Normal University, 100875, Beijing, China



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摘要
摘要:系统整理了星系团A2142的光谱和测光数据．利用花树算法得到的子结构，将星系团视场中的星系分为非子结构、子结构和外围星系3类．通过研究它们的分布、产星活动、D_n4000等物理信息，发现了A2142星系团中的星系存在明显的径向演化趋势．星系从星系团外围落入团中心的过程中，其演化不仅受到星系团内介质的影响，还受到子结构自身的调制．
关键词:星系团/
星系/
恒星形成率/
星系演化
Abstract:A2142 is a massive galaxy cluster at low redshift, which contains a large number of galaxies at different stages of galaxy evolution．The spectral and photometric data of A2142 were systematically sorted out in this article．Substructure was obtained with Blooming tree algorithm, the galaxies in the field of A2142 were divided into three types:non substructure galaxies, substructure galaxies and outskirts galaxies．Their distribution, star formation activity, D_n4000 and other physical properties were studied, the galaxies in the A2142 were found to have an obvious radial evolution trend．If the galaxies fall from the cluster outskirts to the cluster center, their evolution is not only affected by ICM in the galaxy cluster, but also modulated by the substructure．
Key words:galaxy clusters/
galaxies/
star formation rate/
galaxy evolution