2021 Fiscal Year Final Research Report
Study of disk galaxy formation via dynamical interaction using ALMA
Project/Area Number |
19K14769
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 16010:Astronomy-related
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Research Institution | National Astronomical Observatory of Japan |
Principal Investigator |
Ueda Junko 国立天文台, アルマプロジェクト, 特任助教 (60749935)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 電波天文学 / 銀河形成 / 銀河衝突 |
Outline of Final Research Achievements |
High-sensitivity imaging achieved by the multiple arrays of ALMA allowed us to accurately measure the extent and mass of cold molecular gas in galaxies at the final stage of mergers. Some sources in our sample have stable molecular gas disks, which resemble those observed in local disk galaxies, possibly leading to the reformation of disk galaxies. In addition, I focused on the properties of the dense gas, which is the raw material for new stars. The relation between its properties and star formation activity suggests that galaxy interactions and mergers may change the mechanisms of star formation. These results would help us construct a scenario for galaxy formation and evolution through dynamical interaction and merger.
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Free Research Field |
電波天文学
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Academic Significance and Societal Importance of the Research Achievements |
宇宙の主要な構成要素である銀河の形成・進化の解明は、我々が住む天の川銀河をはじめ多種多様な銀河の起源に迫り、宇宙の歴史を理解する上で重要課題である。近年、遠方宇宙において銀河の多様性がいつどのように出現したかという研究も活発に行われており、近傍宇宙でのより詳細な研究の必要性が高まっている。アルマ望遠鏡で取得した観測データをもとに進めた本研究では、銀河衝突・合体を経験した銀河の形成・進化シナリオを構築する上で有用な結果が得られた。
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