2023 Fiscal Year Annual Research Report
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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| Allocation Type | Multi-year Fund |
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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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| Keywords | White dwarf / Proper motion / Luminosity function / Milky Way Galaxy |
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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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| Remarks |
The main work on "Exploring faint white dwarfs and the luminosity function with Subaru HSC and SDSS in Stripe 82" has been submitted to MNRAS and will be published in short.
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