2022 Fiscal Year Final Research Report
Outskirts of nearby large galaxies with Subaru/Hyper Suprime-Cam
| Project/Area Number |
20K04031
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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 | National Astronomical Observatory of Japan |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 銀河考古学 / 光赤外線天文学 / 近傍銀河 / 銀河形成 / 恒星種族 |
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| Outline of Final Research Achievements |
We conducted the "Subaru Near-field cosmology survey" using Hyper Suprime-Cam on Subaru Telescope. Due to the severe weather at Maunakea and unexpected instrument troubles, we only obtained data of five galaxies out of the targeted seven galaxies, covering at least 50 kpc from each galaxy center. We detected diffuse stellar components such as stellar halos and thick disks around all observed galaxies and revealed that these outer structures are ubiquitous in large galaxies.
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| Free Research Field |
天文学
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| Academic Significance and Societal Importance of the Research Achievements |
大型の円盤銀河が銀河系で知られているような複雑で豊富な外縁部構造を持つか否か、またその構造に含まれる恒星の年齢や金属量が共通なのかどうかは、銀河の進化過程における矮小銀河降着の影響を測る上で非常に重要である。本研究では、銀河系が含まれる局所銀河群を超えた距離にある複数の大型円盤銀河をターゲットにして、すばる望遠鏡の超広視野カメラを用いることで、その銀河を構成する個々の星を捉え、非常に暗い外縁部構造の存在とその性質を明らかにした。
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