2016 Fiscal Year Final Research Report
Theoretical study on low-metallicity star formation in the early universe
| Project/Area Number |
25287040
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Yoshida Naoki 東京大学, 理学系研究科, 教授 (90377961)
Hosokawa Takashi 京都大学, 理学研究科, 准教授 (30413967)
Machida Masahiro 九州大学, 理学研究院, 准教授 (10402786)
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| Research Collaborator |
Schneider Raffaella ローマ大学, 理学部, 准教授
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 低金属度星 / 星形成 / 巨大ブラックホール / 銀河形成 |
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| Outline of Final Research Achievements |
We have studied formation of the first stars in the universe by combining cosmological simulations and radiation hydrodynamics for star formation. We have found that the first stars are typically massive in the range of a few tens to a few hundreds of the Sun. In exceptionally intense ultraviolet radiation fields, even supermassive stars with mass more than hundred thousand times the Sun can be formed.
We have also studied the physical conditions in low-metallicity interstellar media by way of three-dimensional hydrodynamics. We have found that multi-phase media is realized in gases with relatively high-metallicity and strong ultraviolet irradiation. In such environment, turbulence can be maintained for long time and so the star formation would be less efficient.
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| Free Research Field |
理論宇宙物理学
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