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ヒラノ シンゴ
Hirano Shingo 平野 信吾 所属 神奈川大学 工学部 応用物理学科 職種 助教 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2024/03 |
| 形態種別 | 学術雑誌 |
| 査読 | 査読あり |
| 標題 | Early Structure Formation from Primordial Density Fluctuations with a Blue, Tilted Power Spectrum: High-redshift Galaxies |
| 執筆形態 | 共著 |
| 掲載誌名 | The Astrophysical Journal |
| 掲載区分 | 国外 |
| 出版社・発行元 | American Astronomical Society |
| 巻・号・頁 | 963(1),pp.2-9 |
| 担当区分 | 筆頭著者,責任著者 |
| 著者・共著者 | ◎Shingo Hirano, Naoki Yoshida |
| 概要 | Recent observations by the James Webb Space Telescope (JWST) discovered unexpectedly abundant luminous galaxies at high redshift, posing possibly a severe challenge to popular galaxy formation models. We study early structure formation in a cosmological model with a blue, tilted power spectrum (BTPS). We run a set of cosmological N-body simulations and derive the abundance of dark matter halos and galaxies under simplified assumptions on star formation efficiency. The enhanced small-scale power allows rapid nonlinear structure formation at z > 7, and galaxies with stellar mass exceeding 1010Msun can be formed by z = 9. The BTPS model reproduces the observed stellar mass density at z = 7-9, and thus eases the claimed tension between galaxy formation theory and recent JWST observations. We conduct a systematic study by varying the slope of the small-scale power spectrum to derive constraints on the BTPS model from a set of observations of high-redshift galaxies. |
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