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AVID: Formation and evolution of a coalesced major merger of late-type dwarf galaxies (VCC 479) on the outskirts of the Virgo cluster

文献类型：期刊论文

作者Sun, Weibin20,21; Zhang, Hong-Xin20,21; Smith, Rory18,19; Brinks, Elias17; Côté, Patrick16; Oh, Se-Heon15; Lin, Zesen14; Boselli, Alessandro13; Ferrarese, Laura16; Li, Fujia20,21
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-08-11
卷号700
关键词ISM: atoms galaxies: dwarf galaxies: evolution galaxies: interactions galaxies: starburst
ISSN号0004-6361
DOI10.1051/0004-6361/202555455
产权排序第13完成单位
文献子类Article
英文摘要Context. Dwarf-dwarf galaxy mergers are among the least explored aspects of dwarf galaxy pre-processing as they fall into clusters. Aims. We present the first case study of a coalesced late-type dwarf major merger (VCC 479; stellar mass similar to 8 x 107 M circle dot) that has undergone significant environmental influence, with the aim of exploring dwarf galaxy evolution under the combined effects of galaxy interactions and environmental processes, and understanding its relevance to the diversity of dwarf galaxies in cluster environments. Methods. Our analysis is based on multifrequency observations, including VLA and FAST HI emission line mapping from the Atomic gas in Virgo Interacting Dwarf galaxies (AVID) survey, and existing ultraviolet and optical images. We also performed idealized hydrodynamical simulations of dwarf-dwarf mergers to help us interpret the observations. Results. We identify symmetric stellar shell structures in VCC 479, indicative of a coalesced major merger of dwarf galaxies. The galaxy features a central starburst, initiated similar to 600 Myr ago, embedded within an exponential disk quenched similar to 1 Gyr ago. The starburst contributes only 2.9 +/- 0.5% of the total stellar mass, and VCC 479's global star formation rate is 0.3 dex lower than typical dwarfs of a similar mass. The galaxy is highly HI-deficient, with most HI gas concentrated within the central 1 kpc and little extended HI envelope. The misalignment of the HI velocity field with the stellar body is best explained by merger-triggered gas inflow, as is seen in our simulations. Conclusions. Our analysis is consistent with a scenario in which the majority of HI gas of the progenitor galaxies was removed by the cluster environment prior to the final coalescence. The merger concentrates the remaining gas toward the galaxy center, triggering a central starburst. The combined effect of environment stripping and galaxy merger has transformed VCC 479 into a blue-core dwarf undergoing a morphological transition from a late-type to an early-type galaxy.
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DIGITAL SKY SURVEY ; STAR-FORMATION PROPERTIES ; STARBURST GALAXIES ; STELLAR POPULATION ; ELLIPTIC GALAXIES ; MERGING GALAXIES ; TINY TITANS ; GAS CONTENT ; MASS ; DISCOVERY
资助项目National Key Research and Development Program of Chinahttps://doi.org/10.13039/501100012166[2023YFA1608100]; National Key Research and Development Program of China[12122303]; National Key Research and Development Program of China[11973039]; National Key Research and Development Program of China[12173079]; NSFC[CMS- CSST-2021-B02]; NSFC[CMS-CSST-2021-A07]; NSFC[CMS-CSST-2021-A06]; China Manned Space Project; CAS Pioneer Hundred Talents Program[XDB 41000000]; Strategic Priority Research Program of Chinese Academy of Sciences; Cyrus Chun Ying Tang Foundations; Chinese Academy of Sciences[1230441]; FONDECYT Regular 2023 project
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001548444100006
出版者EDP SCIENCES S A
资助机构National Key Research and Development Program of Chinahttps://doi.org/10.13039/501100012166[2023YFA1608100] ; National Key Research and Development Program of China[12122303, 11973039, 12173079] ; NSFC[CMS- CSST-2021-B02, CMS-CSST-2021-A07, CMS-CSST-2021-A06] ; China Manned Space Project ; CAS Pioneer Hundred Talents Program[XDB 41000000] ; Strategic Priority Research Program of Chinese Academy of Sciences ; Cyrus Chun Ying Tang Foundations ; Chinese Academy of Sciences[1230441] ; FONDECYT Regular 2023 project
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28506]  
专题星系类星体研究组
通讯作者Zhang, Hong-Xin
作者单位1.Department of Astronomy, Peking University, Beijing 100871, China;
2.AIM, CEA, CNRS, Université Paris-Saclay, Université Paris-Diderot, Sorbonne Paris-Cité Observatoire de Paris, PSL University, 91191 Gif-sur-Yvette Cedex, France
3.Università di Milano-Bicocca, Piazza della Scienza 3, 20100 Milano, Italy;
4.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China;
5.NSF NOIRLab, 950 N. Cherry Avenue, Tucson, AZ 85719, USA;
6.Center for Galaxy Evolution Research, Yonsei University, Seoul 03722, Republic of Korea;
7.Department of Astronomy, Yonsei University, Seoul 03722, Republic of Korea;
8.State Key Laboratory of Radio Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;
9.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China;
10.UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK;
推荐引用方式
GB/T 7714		 Sun, Weibin,Zhang, Hong-Xin,Smith, Rory,et al. AVID: Formation and evolution of a coalesced major merger of late-type dwarf galaxies (VCC 479) on the outskirts of the Virgo cluster[J]. ASTRONOMY & ASTROPHYSICS,2025,700.
APA Sun, Weibin.,Zhang, Hong-Xin.,Smith, Rory.,Brinks, Elias.,Côté, Patrick.,...&Cuillandre, Jean-Charles.(2025).AVID: Formation and evolution of a coalesced major merger of late-type dwarf galaxies (VCC 479) on the outskirts of the Virgo cluster.ASTRONOMY & ASTROPHYSICS,700.
MLA Sun, Weibin,et al."AVID: Formation and evolution of a coalesced major merger of late-type dwarf galaxies (VCC 479) on the outskirts of the Virgo cluster".ASTRONOMY & ASTROPHYSICS 700(2025).

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