Galactic Outflow Production of Multiphase Gas in the Circumgalactic Medium
| Project/Area Number |
19K03911
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | Shinshu University |
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Principal Investigator |
Fujita Akimi 信州大学, 学術研究院工学系, 講師 (50729506)
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| Co-Investigator(Kenkyū-buntansha) |
三澤 透 信州大学, 学術研究院総合人間科学系, 教授 (60513447)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | circumgalactic medium / galactic outflows / numerical simulations / galactic evolution / galaxies / galaxy evolution / simulation |
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| Outline of Research at the Start |
We study the origin and nature of numerous, compact, weak MgII absorbers with high-metallicity and sometimes iron enrichments and surrounding larger, high ionization clouds in the circumgalactic medium (CGM), using hydrodynamic simulations of supernova-driven outflows from a high-redshift dwarf satellite galaxy. We will investigate whether outflows produce the observed conditions of multiphase gas as they expand outward, sweeping up CGM, mix, and cool. Our project will constrain outflow-CGM interaction, thus bringing us one step close to understanding its impact on galaxy evolution.
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| Outline of Final Research Achievements |
Our simulations of galactic outflows from dwarf satellite galaxies highlight the possible roles of galactic outflows producing multiphase, metal-enriched gas in the circumgalactic medium surrounding large, luminous galaxies like the Milky Way galaxy. We find that SNII and SNIa driven outflows interact and continuously generate thin, filamentary cooled gas that are responsible for the observed weak MgII absorbers. They are also surrounded by larger, more diffuse gas that produce CIV and/or OVI absorption in the presence of the UV metagalactic radiation at high redshift. The global importance of dwarf galactic outflows will be addressed in more general simulations.
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| Academic Significance and Societal Importance of the Research Achievements |
銀河の進化の延長に私たち人間の進化がある。よって銀河の進化の探究は人間の存在、その意義の探求に繋がる。
爆発的星形成による銀河アウトフローは銀河円盤から吹き出し、遠く離れた銀河周辺域から銀河間空間にまで到達することもある。吹き出したトンネルを通り、エネルギーや放射が脱出しガスを温めイオン化する。重元素もばら撒かれる。よって、銀河アウトフローは銀河の形成や進化に大きな影響を与えていると考える。銀河周辺域に多く形成されるであろう衛星矮小銀河からの銀河アウトフローが、銀河周辺域のガスの状態を管理し、銀河の進化に影響を与えているという仮説を探求し、様々な可能性を示した点に本研究の意義があったと考える。
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Report
(4 results)
Research Products
(11 results)
