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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 | 2023/09 |
| 形態種別 | 学術雑誌 |
| 査読 | 査読あり |
| 標題 | Formation of first star clusters under the supersonic gas flow - I. Morphology of the massive metal-free gas cloud |
| 執筆形態 | 共著 |
| 掲載誌名 | Monthly Notices of the Royal Astronomical Society |
| 出版社・発行元 | Oxford University Press (OUP) |
| 担当区分 | 筆頭著者,責任著者 |
| 著者・共著者 | ◎Shingo Hirano,Youcheng Shen,Sho Nishijima,Yusuke Sakai,Hideyuki Umeda |
| 概要 | Abstract
We performed 42 simulations of first star formation with initial supersonic gas flows relative to the dark matter at the cosmic recombination era. Increasing the initial streaming velocities led to delayed halo formation and increased halo mass, enhancing the mass of the gravitationally shrinking gas cloud. For more massive gas clouds, the rate of temperature drop during contraction, in other words, the structure asymmetry, becomes more significant. When the maximum and minimum gas temperature ratios before and after contraction exceed about ten, the asymmetric structure of the gas cloud prevails, inducing fragmentation into multiple dense gas clouds. We continued our simulations until 105 years after the first dense core formation to examine the final fate of the massive star-forming gas cloud. |
| DOI | 10.1093/mnras/stad2693 |
| ISSN | 0035-8711/1365-2966 |
| PermalinkURL | https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad2693/51402709/stad2693.pdf |
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