AVID: A near-major post-merger of late-type dwarfs beneath a regularly rotating H I disk (VCC 693)
文献类型：期刊论文
| 作者 | Li, Fujia2,3,4; Zhang, Hong-Xin2,3; Brinks, Elias5; Oh, Se-Heon6,7; Smith, Rory8,9; Lin, Zesen10; Sun, Weibin2,3; Sun, Yu-Zhu2,3; Li, Tie2,3; Kim, Minsu6,7 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2026-04-08 |
| 卷号 | 708 |
| 关键词 | ISM: atoms ISM: kinematics and dynamics galaxies: clusters: general galaxies: dwarf galaxies: evolution |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202557482 |
| 产权排序 | 第20完成单位 |
| 文献子类 | Article |
| 英文摘要 | In the periphery of galaxy clusters, the combination of moderately high galaxy number densities and modest velocity dispersions favors interactions and mergers that affect the galaxy evolution prior to cluster infall. Observational studies of this important phase of galaxy evolution, particularly in the dwarf galaxy regime, are still rare. We present a high-resolution case study of VCC 693 (stellar mass similar to 2.8 & times; 10(8) M-circle dot), a merger remnant in the outskirts of the Virgo cluster, using observations from the project Atomic gas in Virgo Interacting Dwarf galaxies (AVID). We explored the consequences of the merger on the star formation and structural evolution of VCC 693, based on a joint analysis of high-resolution Karl G. Jansky Very Large Array and high-sensitivity Five-Hundred-meter Aperture Spherical radio Telescope H I emission line observations, optical broadband images, narrowband H alpha images, and optical spectra. We also employed hydrodynamical simulations of dwarf-dwarf mergers to aid in interpreting the observations of VCC 693. Our analysis favors a near-major merger between two late-type dwarf galaxies with a stellar mass ratio of approximately 3:1-4:1, in which one of the progenitors is likely relatively gas poor (i.e., a damp merger). The optical appearance of VCC 693 is dominated by complex tidal structures spanning the whole system, whereas the H I gas has settled to a regular rotating disk with a normal surface density profile. Compared to dwarfs of similar mass, the star formation and gas-phase metallicity are moderately enhanced in the center. The global star formation rate, H I gas content, and H I-to-optical size ratio of VCC 693 are broadly consistent with those of typical late-type dwarfs of similar mass, although they fall at the lower side of the distributions. By decomposing the H I rotation curve into the baryonic and dark matter component, we found that the dark matter halo is characterized by an unusually high concentration or core density. This implies that the dark matter halo might have relaxed into a more centrally peaked distribution following the merger event. Together with two other recent studies of AVID post-merger systems, our findings reinforce the emerging view that even major mergers between dwarfs can produce remnants whose overall stellar structures, apart from tidal features, are indistinguishable from those of ordinary dwarfs, and that the diverse environmental effects experienced by galaxies in cluster outskirts can promote damp or mixed mergers, which constitute an integral part of galactic preprocessing. |
| 学科主题 | 天文学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
| WOS关键词 | GENERATION VIRGO CLUSTER ; STAR-FORMATION HISTORIES ; IRREGULAR GALAXIES ; MASS ACCRETION ; DARK HALOES ; TINY TITANS ; CATALOG ; STELLAR ; CURVES ; HARASSMENT |
| 资助项目 | National Science Foundation of China (NSFC)[12233008]; National Science Foundation of China (NSFC)[12122303]; National Science Foundation of China (NSFC)[11973039]; National Science Foundation of China (NSFC)[12173079]; National Key R&D Program of China[2023YFA1608100]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0550200]; Cyrus Chun Ying Tang Foundations; The 111 Project[B23042]; China Manned Space Project[CMS-CSST-2021B02]; China Manned Space Project[CMS-CSST-2021-A07]; China Manned Space Project[CMS-CSST-2021-A06]; CAS Pioneer Hundred Talents Program; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000]; National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT: MSIT)[RS2022-00197685]; National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT: MSIT)[RS-2023-00243222]; FONDECYT[1230441]; ANID[MILENIO NCN2024_112] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001736056200001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Science Foundation of China (NSFC)[12233008, 12122303, 11973039, 12173079] ; National Key R&D Program of China[2023YFA1608100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0550200] ; Cyrus Chun Ying Tang Foundations ; The 111 Project[B23042] ; China Manned Space Project[CMS-CSST-2021B02, CMS-CSST-2021-A07, CMS-CSST-2021-A06] ; CAS Pioneer Hundred Talents Program ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT: MSIT)[RS2022-00197685, RS-2023-00243222] ; FONDECYT[1230441] ; ANID[MILENIO NCN2024_112] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29126]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Zhang, Hong-Xin; Oh, Se-Heon; Kong, Xu |
| 作者单位 | 1.Department of Astronomy, Yonsei University, Seoul 03722, Republic of Korea; 2.Department of Astronomy, University of Science and Technology of China, Hefei 230026, China; 3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; 4.Institute of Deep Space Sciences, Deep Space Exploration Laboratory, Hefei 230026, China; 5.Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK; 6.Department of Astronomy and Space Science, Sejong University, Seoul 05006, Republic of Korea; 7.Department of Physics and Astronomy, Sejong University, Seoul 05006, Republic of Korea; 8.Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Avenida España 1680 Valparaíso, Chile; 9.Millenium Nucleus for Galaxies (MINGAL), Valparaíso, Chile; 10.Institute for Astrophysics, School of Physics, Zhengzhou University, Zhengzhou 450001, China; |
| 推荐引用方式 GB/T 7714 | Li, Fujia,Zhang, Hong-Xin,Brinks, Elias,et al. AVID: A near-major post-merger of late-type dwarfs beneath a regularly rotating H I disk (VCC 693)[J]. ASTRONOMY & ASTROPHYSICS,2026,708. |
| APA | Li, Fujia.,Zhang, Hong-Xin.,Brinks, Elias.,Oh, Se-Heon.,Smith, Rory.,...&赵应和.(2026).AVID: A near-major post-merger of late-type dwarfs beneath a regularly rotating H I disk (VCC 693).ASTRONOMY & ASTROPHYSICS,708. |
| MLA | Li, Fujia,et al."AVID: A near-major post-merger of late-type dwarfs beneath a regularly rotating H I disk (VCC 693)".ASTRONOMY & ASTROPHYSICS 708(2026). |
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来源：云南天文台
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