The Clumpy Structure of Five Star-bursting Dwarf Galaxies in the MaNGA Survey

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外文摘要：The star-forming clumps in star-bursting dwarf galaxies provide valuable insights into understanding the evolution of dwarf galaxies.In this paper,we focus on five star-bursting dwarf galaxies featuring off-centered clumps in the Mapping Nearby Galaxies at Apache Point Observatory survey.Using the stellar population synthesis software Fitting Analysis using Differential evolution Optimization,we obtain the spatially resolved distribution of the star formation history,which allows us to construct the g-band images of the five galaxies at different ages.These images can help us to probe the evolution of the morphological structures of these galaxies.While images of a stellar population older than 1 Gyr are typically smooth,images of a stellar population younger than 1 Gyr reveal significant clumps,including multiple clumps which appear at different locations and even different ages.To study the evolutionary connections of these five galaxies to other dwarf galaxies before their star-forming clumps appear,we construct the images of the stellar populations older than three age nodes,and define them to be the images of the"host"galaxies.We find that the properties such as the central surface brightness and the effective radii of the hosts of the five galaxies are in between those of dwarf ellipticals(dEs)and dwarf irregulars(dIrrs),with two clearly more similar to dEs and one more similar to dIrrs.Among the five galaxies,8257-3704 is particularly interesting,as it shows a previous starburst event that is not quite visible from its gri image,but only visible from images of the stellar population at a few hundred million years.The star-forming clump associated with this event may have appeared at around 600 Myr ago and disappeared at around 40 Myr ago.

外文关键词：

galaxies:dwarfgalaxies:evolutiongalaxies:formationGalaxy:structure

作者：

Mengting Ju、Jun Yin、Lei Hao、Chenxu Liu、Chao-Wei Tsai、Junfeng Wang、Zhengyi Shao、Shuai Feng、Yu Rong

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作者单位：

Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

University of Chinese Academy of Sciences,Beijing 100049,China

Key Lab for Astrophysics,Shanghai 200034,China

South-Westem Institute for Astronomy Research,Yunnan University,Kunming 650500,China

National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

Institute for Frontiers in Astronomy and Astrophysics,Beijing Normal University,Beijing 102206,China

Department of Astronomy,Physics Building,Xiamen University,Xiamen,Fujian 361005,China

College of Physics,Hebei Normal University,Shijiazhuang 050024,China

Hebei Key Laboratory of Photophysics Research and Application,Shijiazhuang 050024,China

Department of Astronomy,University of Science and Technology of China,Hefei 230026,China

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基金：

国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金上海市自然科学基金Program of Shanghai Academic Research LeaderCAS Pioneer Hundred Talents Program,USTC Research Funds of the Double First-Class Initiative国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Alfred P.Sloan FoundationU.S.Department of Energy Office of ScienceParticipating InstitutionsCenter for High-Performance Computing at the University of Utah

项目编号：

2019YFA04055012022YFF0503402122330051204130222ZR147300022XD140420012273037120330041233300312273091U2031139

出版年：

2024

DOI：

10.1088/1674-4527/ad1046

天文和天体物理学研究

中国科学院国家天文台

天文和天体物理学研究

CSTPCD

影响因子：0.406

ISSN：1674-4527

年,卷(期)：2024.24(2)

参考文献量78