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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 | 2024/04 |
| 形態種別 | 学術雑誌 |
| 査読 | 査読あり |
| 標題 | Low-mass Population III Star Formation due to the HD Cooling Induced by Weak Lyman-Werner Radiation |
| 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 | 965(2),pp.141-151 |
| 担当区分 | 責任著者 |
| 著者・共著者 | ◎Sho Nishijima, Shingo Hirano,Hideyuki Umeda |
| 概要 | We investigate the effects of LW radiation at 18 different intensities, ranging from JLW/J21 = 0 (no radiation) to 30 (H-cooling cloud), on the primordial star-forming gas cloud obtained from a three-dimensional cosmological simulation. Due to the HD cooling, however, the dependence of gas cloud temperature on JLW deviates from the aforementioned increasing trend for a specific range of intensities (JLW/J21 = 0.025-0.09). In HD-cooling clouds, the temperature remained below 200 K during 105 yr after the first formation of the high-density region, maintaining a low accretion rate. Finally, the HD-cooling clouds have only a low-mass dense core (above 108 cm−3) with about 1-16 Msun, inside of which a low-mass Pop III star with < 0.8 Msun (a so-called "surviving star") could form. The upper limit of star formation efficiency significantly decreases as HD cooling becomes effective. |
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