Revealing the environments of long-duration gamma-ray bursts with molecular gas and dust observations
| Project/Area Number |
15K17616
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo (2016-2018)
National Astronomical Observatory of Japan (2015) |
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Principal Investigator |
Hatsukade Bunyo 東京大学, 大学院理学系研究科(理学部), 助教 (70719484)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 銀河 / ガンマ線バースト / 分子ガス / 星形成 / 電波 / 銀河形成 / 銀河進化 / ダスト |
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| Outline of Final Research Achievements |
Long-duration gamma-ray bursts (GRBs) are thought to be due to the explosion of massive stars. We observed molecular gas, the fuel for star formation, in host galaxies of GRBs by using ALMA to examine the environment of GRB birthplace. We successfully detected molecular gas in 16 hosts. This is the largest sample among existing studies, allowing us to study statistically the hosts in terms of molecular gas for the first time. We found that star-formation efficiency and gas consumption timescale in the hosts can be explained by the same scaling law as normal star-forming galaxies. This suggests that GRBs occur in normal star-forming environments.
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| Academic Significance and Societal Importance of the Research Achievements |
ロング・ガンマ線バースト(GRB)は、短時間にガンマ線が宇宙から観測される現象で、巨大な星が一生を終える際の大爆発であると考えられている。宇宙最大規模の爆発現象であるが、そのメカニズムは発生環境についてはまだ解明されていない点が多い。本研究では、GRBがどのような環境で発生するのかを探るため、これまで観測が進んでいなかった分子ガス（星形成の材料）に着目した。アルマ望遠鏡を用いてGRBが発生した銀河（母銀河）の観測を行い、既存の研究の中で最大のサンプルを構築した。これにより初めて統計的な研究に基づいてGRBが一般的な環境で発生することを示唆する結果を得た。
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Report
(5 results)
Research Products
(16 results)
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[Journal Article] High-resolution ALMA observations of SDP.81. II. Molecular clump properties of a lensed submillimeter galaxy at z = 3.0422015
Author(s)
Hatsukade, B., Tamura, Y., Iono, D., Matsuda, Y., Hayashi, M., Oguri, M.
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Journal Title
Publications of Astronomical Soc of Japan
Volume: 67
Issue: 5
Pages: 937-937
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Optical-Infrared Properties of Faint 1.3 mm Sources Detected with ALMA2015
Author(s)
Hatsukade, B., Ohta, K., Yabe, K., Seko, A., Makiya, R., Akiyama, M.
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Journal Title
Astrophysical Journal
Volume: 810
Issue: 2
Pages: 91-91
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Science Cases for High-z Objects2019
Author(s)
B. Hatsukade, K. Kohno, Y. Yoshimura, Y. Tamura
Organizer
Power of wideband receiver: Exploring sciences at 7mm wavelength with large single dish telescopes, NAOJ-ASIAA Joint Workshop
Related Report
Int'l Joint Research / Invited
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[Presentation] Gamma-ray bursts from dusty regions with little molecular gas2015
Author(s)
Hatsukade, B., Ohta, K., Endo, A., Nakanishi, K., Tamura, Y., Hashimoto, T., Kohno, K.
Organizer
Gas, Dust, and Star-Formation in Galaxies from the Local to Far Universe
Place of Presentation
Chania, Crete, Greece
Year and Date
2015-05-25
Related Report
Int'l Joint Research
