Revealing a Head-on Major Merger in the Nearby NGC 6338 Group with Chandra and VLA Observations
文献类型：期刊论文
| 作者 | Wang, Yu4; Lui, Fuyao4; Shen, Zinqiang3; Wang, Jingying2; Hu, Dan6; Xu, Hai-Guang1,5,6 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-01-10 |
| 卷号 | 870期号:2页码:8 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: groups: individual (NGC 6338 group) ISM: kinematics and dynamics X-rays: galaxies: clusters |
| DOI | 10.3847/1538-4357/aaf234 |
| 英文摘要 | By analyzing the Chandra archival data of the nearby NGC 6338 galaxy group, we identify two X-ray bright clumps (N-clump and S-clump) within the central 100 h(73)(-1) kpc, and detect an arc-like X-ray brightness discontinuity at the south boundary of the N-clump, which is defined as a cold front with a gas flow Mach number of M < 0.8. Furthermore, at the northeast boundary of the S-clump (dominated by galaxy NGC 6338) another X-ray edge is detected that corresponds to a weaker cold front. Therefore, the two clumps are approaching each other approximately from opposite directions, and the group is undergoing a head-on collision that is in a stage of pre-core passage. This merger scenario is also supported by the study of the line-of-sight velocity distribution of the group member galaxies. The merger mass ratio is about 1:1.8 as estimated from the central gas temperature of the two clumps, which suggests the merger is most likely to be a major merger. We also analyze the Very Large Array 1.4 and 4.9 GHz radio data, but we do not detect any extended radio emission that is associated with the merger. |
| 资助项目 | Ministry of Science and Technology of China[2018YFA0404601] ; National Science Foundation of China[11103057] ; National Science Foundation of China[11433002] ; National Science Foundation of China[11533004] ; National Science Foundation of China[11621303] ; National Science Foundation of China[61371147] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000456063900013 |
| 源URL | [http://119.78.226.72/handle/331011/31983]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Wang, Yu |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, 800 Dongchuan Rd, Shanghai 200240, Peoples R China 2.Univ Western Cape, Dept Phys & Astron, ZA-7535 Cape Town, South Africa 3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Shanghai Univ Engn Sci, Sch Math Phys & Stat, 333 Longteng Rd, Shanghai 201620, Peoples R China 5.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, 800 Dongchuan Rd, Shanghai 200240, Peoples R China 6.Shanghai Jiao Tong Univ, Sch Phys & Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yu,Lui, Fuyao,Shen, Zinqiang,et al. Revealing a Head-on Major Merger in the Nearby NGC 6338 Group with Chandra and VLA Observations[J]. ASTROPHYSICAL JOURNAL,2019,870(2):8. |
| APA | Wang, Yu,Lui, Fuyao,Shen, Zinqiang,Wang, Jingying,Hu, Dan,&Xu, Hai-Guang.(2019).Revealing a Head-on Major Merger in the Nearby NGC 6338 Group with Chandra and VLA Observations.ASTROPHYSICAL JOURNAL,870(2),8. |
| MLA | Wang, Yu,et al."Revealing a Head-on Major Merger in the Nearby NGC 6338 Group with Chandra and VLA Observations".ASTROPHYSICAL JOURNAL 870.2(2019):8. |
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来源：上海天文台
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