Study on structure of the Milky Way galaxy and mechanisms of cosmic transient phenomena probed by optical all-sky polarimetric survey
| Project/Area Number |
18H03720
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 16:Astronomy and related fields
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| Research Institution | Hiroshima University |
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Principal Investigator |
Kawabata Koji 広島大学, 宇宙科学センター, 教授 (60372702)
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| Co-Investigator(Kenkyū-buntansha) |
渡邉 誠 岡山理科大学, 理学部, 准教授 (10450181)
西山 正吾 宮城教育大学, 教育学部, 准教授 (20377948)
松村 雅文 香川大学, 教育学部, 教授 (50239084)
當真 賢二 東北大学, 学際科学フロンティア研究所, 准教授 (70729011)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥43,940,000 (Direct Cost: ¥33,800,000、Indirect Cost: ¥10,140,000)
Fiscal Year 2020: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2019: ¥23,400,000 (Direct Cost: ¥18,000,000、Indirect Cost: ¥5,400,000)
Fiscal Year 2018: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
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| Keywords | 光学赤外線天文学 / 宇宙物理学 / 宇宙科学 / 星間物質 / 偏光 / 銀河磁場 / ガンマ線バースト / 星間ダスト |
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| Outline of Final Research Achievements |
By designing of a half-wave plate and a polarization beam splitter with a large effective areas, wide-wavebands and large tolerance angles of incidence as well as a compact optical train that hold the key to realize the wide-field polarimeter for the SGMAP project, which builds a large-scale and highly accurate polarization database provided by polarimetric survey of millions of stars in the northern hemisphere, and through the optical test of their prototype or simulation of them, the feasibility of the optical and near-infrared multi-band polarization survey with a 1.5-m Kanata telescope. In addition, we carry out polarization imaging observations of Galactic plane area and polarized objects showing time variation using existing equipment, develop a data reduction pipeline for the polarization survey observations based on actual data, and thus get the beginning of the astronomical researches on the three-dimensional structure of Galactic magnetic field, etc.
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| Academic Significance and Societal Importance of the Research Achievements |
「偏光」は電磁波が有する基本的情報であり、強度のみでは判り得ない空間分解能以下の天体の形状や電磁波の放射機構、放射源ないし星間媒質中の磁場の向き、散乱体の光学的性質などといったベクトル的情報をもたらしてくれる有効な観測手段であるが、現存する可視全天偏光サーベイカタログは主として1960-80年代の非一様な偏光観測をまとめた高々1万個の（単バンドの）ものに留まっている。2桁以上多いサンプルに対し複数バンドの偏光カタログを得ることにより、銀河系の物質進化を司る銀河磁場の三次元マッピングをはじめ、活動銀河核やガンマ線バーストのジェット生成機構等、天文学上の大きな派生効果が期待される。
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Report
(4 results)
Research Products
(27 results)
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[Journal Article] Implications of High Polarization Degree for the Surface State of Ryugu2021
Author(s)
Kuroda D., Geem J., Akitaya H., Jin S., Takahashi J., Takahashi K., Naito H., Makino K., Sekiguchi T., Bach Y. P., Seo J., Sato S., Sasago H., Kawabata K. S., Kawakami A., Tozuka M., Watanabe M., Takagi S., Kuramoto K., Yoshikawa M., Hasegawa S., Ishiguro M.
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Journal Title
The Astrophysical Journal Letters
Volume: 911
Issue: 2
Pages: L24-L24
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Extended optical/NIR observations of Type Iax supernova 2014dt: Possible signatures of a bound remnant2018
Author(s)
Kawabata, Miho; Kawabata, Koji S.; Maeda, Keiich; Yamanaka, Masayuki; Nakaoka, Tatsuya; Takaki, Katsutoshi; Fukushima, Daiki; Kojiguchi, Naoto; Masumoto, Kazunari; Matsumoto, Katsura; Akitaya, Hiroshi; Itoh, Ryosuke, et al.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 70
Issue: 6
Pages: 111-132
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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