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大学・研究所にある論文を検索できる 「異なる環境における星形成に関する研究」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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異なる環境における星形成に関する研究

樋口, 公紀 HIGUCHI, Koki ヒグチ, コウキ 九州大学

2020.03.23

概要

The environment in which stars are formed varies depending on the location and time of the galaxy. Furthermore, stars are closely related to the formation of galaxies and the chemical evolution of the universe. Therefore, in order to understand the history of the universe, it is necessary to clarify the star formation process. The evolution of collapsing clouds embedded in different environments is investigated using three-dimensional non-ideal magnetohydrody- namics simulations considering different metallicities (Z/Z⊙) and ionization strengths (Cζ, where Cζ is a coefficient controlling the ionization intensity). I consider 32 different star-forming environments in combination with Z = 0, 10−7, 10−6, 10−5, 10−4, 10−3, 10−2, 10−1 Z⊙ and Cζ = 0, 0.01, 1, 10, and prepare clouds having different the mass-to-flux ratio μ0 and the ratio of rotational energy to gravitational energy β0. I investigate the fragmentation condition in various star-forming environments. I perform 334 runs in total and it is found that 71 models show fragmentation and 15 models show a spiral structure. This study indicates that fragmentation tend to be occuered with high ionization strength, high metallicity, high μ 0 (μ0 ≥ 10, where μ0 means the mass-to-flux ratio normalized by the critical value), and high β0 (β0 ≥ 3.0 × 10−2). In the collapsing cloud, fragmentation occuers when the following conditions are fullfilled; the high oblateness of core εob ≥ 5, μ ≥ 0.6 − 1.0, and β ≥ 1.0 × 10 −2. There are some non- fragmentation models with high μ0 and β0. These models are likely to show fragmentation in the later phase. A closed binary system should be appeared in such models. Furthermore, if these binaries gain a lot of mass and grow into a massive star binary, it can be the origin of the binary black hole.

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