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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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2016: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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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 / 宇宙初代星 / 宇宙初期天体 / 宇宙論 |
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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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Report
(5 results)
Research Products
(40 results)
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[Journal Article] From the first stars to the first black holes2016
Author(s)
Valiante, Rosa; Schneider, Raffaella; Volonteri, Marta; Omukai, Kazuyuki
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 457
Issue: 3
Pages: 3356-3371
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Formation of Massive Primordial Stars: Intermittent UV Feedback with Episodic Mass Accretion2016
Author(s)
Hosokawa,T., Hirano,S., Kuiper,R., Yorke,H.W., Omukai,K., & Yoshida,N.
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Journal Title
The Astrophysical Journal
Volume: 824
Issue: 2
Pages: 119-119
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Supermassive star formation via episodic accretion: protostellar disc instability and radiative feedback efficiency2016
Author(s)
Sakurai,Y., Vorobyov,E.I., Hosokawa,T., Yoshida,N., Omukai,K., & Yorke,H.W.
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 459
Issue: 2
Pages: 1137-1145
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] The Origin of the Most Iron-poor Star2014
Author(s)
Marassi, S.; Chiaki, G.; Schneider, R.; Limongi, M.; Omukai, K.; Nozawa, T.; Chieffi, A.; Yoshida, N.
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Journal Title
The Astrophysical Journal
Volume: 794
Issue: 2
Pages: 100-100
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Presentation] Seed black hole formation via direct collapse2015
Author(s)
Kazuyuki Omukai
Organizer
Understanding the growth of the first supermassive black holes, Symposium in EWASS 2015 meeting
Place of Presentation
University of La Laguna, Tenerife, Spain
Year and Date
2015-06-22
Related Report
Int'l Joint Research / Invited
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