| 研究課題/領域番号 |
19K14755
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| 研究機関 | 東京大学 |
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研究代表者 |
Lee KheeGan 東京大学, カブリ数物連携宇宙研究機構, 特任講師 (10822091)
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| 研究期間 (年度) |
2019-04-01 – 2021-03-31
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| キーワード | astrophysics / cosmology / large-scale structure / intergalactic medium / galaxies / astronomy |
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| 研究実績の概要 |
In 2019 and early 2020, we completed the final data collection of our intergalactic medium (IGM) tomography observationals on the Keck-I telescope. The data reduction is almost complete and will be used in ongoing analyses. In preparation for this, we have published a method to estimate the cosmic web from the IGM tomography data in collaboration with a visiting student. To enable a comparison with the IGM absorption data, we have also carried out a density-field reconstruction in the COSMOS field using existing galaxy spectroscopic catalogs, which is now submitted.
We also participated in scientific planning activities for the Subaru Prime Focus Spectrograph (PFS) strategic survey.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
As expected, our observations was completed in late 2019 and the data reduction is almost completed now. At the same time, we have finalized the matter density estimation from galaxy spectroscopic data in the same volume (COSMOS field), which will enable a direct comparison between the IGM absorption and the underlying matter density field. We are also compiling mock data from various hydrodynamical simulations (e.g. Nyx, Illustris, IllustrisTNG) that will be used together with the observational data to test the fluctuating Gunn-Peterson approximation between absorption and matter density. We are also still carrying out a theory project to study how galaxy feedback can pre-heat the proto-intra cluster medium in high-redshift galaxy protoclusters.
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| 今後の研究の推進方策 |
We are about to begin the constrained realization analysis of the density field estimate of the COSMOS field, which will allow us to predict the evolutionary path of the high-redshift galaxy protoclusters observed in the data. To aid this, our institute has recently acquired a GPU machine and we will learn how to exploit this capability in this project.
We have also recently begun to study possibility of galaxy intrinsic alignment analysis between coeval galaxies and the cosmic web estimated from the COSMOS IGM tomography data.
We will also begin the data reduction and analysis of pilot IGM tomography in the foreground of ultra-luminous quasars, which will be imprinted by the quasars' light echo and allow us to estimate quasar age and inclination angles.
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