| Project/Area Number |
24H00241
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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 | The University of Tokyo |
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Principal Investigator |
Lee KheeGan 東京大学, カブリ数物連携宇宙研究機構, 准教授 (10822091)
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| Co-Investigator(Kenkyū-buntansha) |
大内 正己 東京大学, 宇宙線研究所, 教授 (40595716)
長峯 健太郎 大阪大学, 大学院理学研究科, 教授 (50714086)
柏野 大地 国立天文台, 科学研究部, 特任助教 (80897588)
SILVERMAN John 東京大学, カブリ数物連携宇宙研究機構, 教授 (90573030)
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| Project Period (FY) |
2024-04-01 – 2028-03-31
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| Project Status |
Granted (Fiscal Year 2025)
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| Budget Amount *help |
¥46,800,000 (Direct Cost: ¥36,000,000、Indirect Cost: ¥10,800,000)
Fiscal Year 2025: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2024: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
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| Keywords | astrophysics / galaxies / intergalactic medium / cosmology / Astronomy / Cosmology / Galaxies / Intergalactic medium / Cosmic Baryons |
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| Outline of Research at the Start |
The basic product of our program is the cosmic web generated by the Lyman-alpha forest IGM tomography created from the background galaxies. This will be used to study the galaxy properties as a function of the cosmic web. We will also identify galaxy protoclusters and study their thermal properties as probed by the absorption, which will constrain AGN feedback models. In the longer term, we will develop field inference techniques, which will let us run hydrodynamical simulations based directly on the data set.
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| Outline of Annual Research Achievements |
We published a paper regarding the environmental dependence of galaxy properties relative to the 3D large-scale matter distribution, for the first time at z>2. This was based on pathfinder data from the earlier CLAMATO survey, but establishes techniques that will be applicable to Subaru PFS. On the theory aspect, me and my collaborators also published a paper that establishes novel forward-modeling techniques that aims to establish new links between observed galaxy properties and detailed cosmological hydrodynamical simulations.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The original proposal had the expectation that the Subaru PFS SSP will begin in the S24B semester. This had been slightly delayed to S25A (the current observing semester), and in addition the science verification tasks that were previously expected to be carried out during commissioning observations are now instead being done during the science allocations.
The PI and grant-funded postdoc, K. McCarthy, are now deeply involved in the actual observing and validation of the data during these early phases.
We are also preparing for real science analysis with the PFS data, including developing the IGM tomography and absorption power spectrum pipeline, as well as LBG clustering framework, both using numerical simulations to create realistic mock data.
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| Strategy for Future Research Activity |
Despite the slight delay, with the ongoing start of the Subaru SSP observations, we can now anticipate real data. In addition to the hands-on observing and validation of the Subaru PFS data, we are now also actively preparing for several analysis that will proceed using these data.
1. First measurement of the small-scale 3D Ly-a forest power spectrum using PFS data. The preparation for this analysis is already ongoing, with the power spectrum pipeline being tested on hydrodynamical simulation mocks.
2. 3D LBG clustering measurement on the PFS redshift catalog. The pipeline is also being developed using mocks from the Uchuu N-body simulations, which allows us to have precise covariances and forward model once the real PFS data is ready.
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