FAST Reveals New Evidence for M94 as a Merger | |
Zhou, Ruilei5,6,7; Zhu, Ming4,5,6,7; Yang, Yanbin3; Yu, Haiyang5,6,7; Yuan, Lixia2; Jiang, Peng4,5,7; Xi WZ(席文哲)1,6 | |
刊名 | ASTROPHYSICAL JOURNAL |
2023-08-01 | |
卷号 | 952期号:2 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/acdcf5 |
产权排序 | 第7完成单位 |
文献子类 | Article |
英文摘要 | We report the first high-sensitivity H i observation toward the spiral galaxy M94 with the Five-hundred-meter Aperture Spherical radio Telescope. From these observations, we discovered that M94 has a very extended H i disk, twice larger than that observed by THINGS, which is accompanied by a H i filament and seven high velocity clouds (HVCs) at different distances. The projected distances of these clouds and filaments are less than 50 kpc from the galactic center. We measured a total integrated flux (including all clouds/filament) of 127.3 ( & PLUSMN;1) Jy km s(-1), corresponding to a H i mass of (6.51 & PLUSMN; 0.06)x10(8) M (& ODOT;) , which is 63.0% more than that observed by THINGS. By comparing numerical simulations with the H i maps and the optical morphology of M94, we suggest that M94 is likely a remnant of a major merger of two galaxies, and the HVCs and H i filament could be the tidal features that originated from the first collision of the merger, which happened about 5 Gyr ago. Furthermore, we found a seemingly isolated H i cloud at a projection distance of 109 kpc without any optical counterpart detected. We discuss the possibilities of the origin of this cloud, such as dark dwarf galaxy and RELHIC (REionization-Limited H i Cloud). Our results demonstrate that high-sensitivity and wide-field H i imaging is important in revealing diffuse cold gas structures and tidal debris, which is crucial to understand the dynamical evolution of galaxies. |
学科主题 | 天文学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Key Ramp ; D Program of China[2018YFE0202900] ; National Key Ramp ; D Program of China[2017YFA0402600] ; National Natural Foundation of China (NSFC)[12041302] ; National Natural Foundation of China (NSFC)[11973042] ; CNRS ; Yunnan University ; International Research Program (IRP) Tianguan ; NAOC |
WOS关键词 | LOCAL GROUP ; STAR-FORMATION ; GALAXY ; GAS ; DISKS ; MORPHOLOGY ; KINEMATICS ; DISCOVERY ; NGC-4736 ; CLUSTER |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:001034178200001 |
资助机构 | National Key Ramp ; D Program of China[2018YFE0202900, 2017YFA0402600] ; National Natural Foundation of China (NSFC)[12041302, 11973042] ; CNRS ; Yunnan University ; International Research Program (IRP) Tianguan ; NAOC |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/26149] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Zhu, Ming |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China 2.Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 10 Yuanhua Road, Qixia District, Nanjing 210033, People's Republic of China; 3.GEPI, Observatoire de Paris, CNRS, Place Jules Janssen F-92195, Meudon, France; 4.Guizhou Radio Astronomical Observatory, Guizhou University, Guiyang 550000, People's Republic of China; 5.CAS Key Laboratory of FAST, National FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; 6.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 7.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Beijing 100101, People's Republic of China; mz@nao.cas.cn; |
推荐引用方式 GB/T 7714 | Zhou, Ruilei,Zhu, Ming,Yang, Yanbin,et al. FAST Reveals New Evidence for M94 as a Merger[J]. ASTROPHYSICAL JOURNAL,2023,952(2). |
APA | Zhou, Ruilei.,Zhu, Ming.,Yang, Yanbin.,Yu, Haiyang.,Yuan, Lixia.,...&Xi WZ.(2023).FAST Reveals New Evidence for M94 as a Merger.ASTROPHYSICAL JOURNAL,952(2). |
MLA | Zhou, Ruilei,et al."FAST Reveals New Evidence for M94 as a Merger".ASTROPHYSICAL JOURNAL 952.2(2023). |
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