すばるHSCによる高速固有運動の測定に基づくコンパクト天体の研究
| Project/Area Number |
22KJ0831
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| Project/Area Number (Other) |
22J11959 (2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2022) |
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| Section | 国内 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
邱 天 東京大学, 理学系研究科, 特別研究員(PD)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2023: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | White dwarf / Proper motion / Luminosity function / Milky Way Galaxy / Star forming history |
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| Outline of Research at the Start |
I am probing the white dwarfs in our Milky Way Galaxy. I have taken the advantage of the data from the unprecedented deep Hyper-Supreme Cam survey to discover the faint and old compact objects, which is the fossil of our Galaxy. The luminosity function is a track to explore the evolution history.
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| Outline of Annual Research Achievements |
I have completed the project on white dwarfs and their luminosity function. Utilizing the Hyper-Supreme Cam (HSC) of the Subaru Telescope, in conjunction with the Sloan Digital Sky Survey (SDSS), I conducted precise proper motion measurements to investigate faint white dwarfs, leading to the discovery of white dwarfs which has never been observed before. Furthermore, spectroscopic fitting was employed to validate and
characterize the properties of these white dwarfs. Notably, a significant number of extremely low-temperature white dwarf candidates, with temperatures below 5,000K, were identified. These candidates are believed to represent the oldest stellar population, serving as fossils of our Milky Way Galaxy. Based on the white dwarf catalog, I constructed the white dwarf luminosity function (WDLF), extending its coverage to the very faint end for both the disk and halo regions. These faint white dwarfs are hypothesized to have originated from much older structures, such as Gaia-Enceladus, which have already merged into our Milky Way Galaxy.This study underscores the power of deep surveys like HSC, serving as a precursor to future surveys such as the Large Synoptic Survey Telescope (LSST).
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Report
(2 results)
Research Products
(5 results)
