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arXiv 1005.1707astro-ph.CO
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磁化原始云中的星族III恒星形成

Population III Star Formation in Magnetized Primordial Clouds

Masahiro N. Machida

摘要:

利用三维理想MHD模拟研究了原始坍缩云的演化和原第III星族星的形成。我们计算了磁化原始云的演化,从星前阶段,直到原人口III恒星形成后的时代,空间分辨秒差距尺度的云和次AU尺度的原恒星。原星族III星的形成过程是由母云的转动能与磁能之比来表征的。当转动能大于磁能时,在原星族III恒星形成和双星或多星系统出现之前,坍缩的原始云发生碎裂。相反,当磁能大于转动能时,大于100 km s^-1的强喷流由围绕原星族III星的星周盘驱动,而没有碎裂。因此,即使在早期宇宙中,磁场在恒星形成过程中也起着重要作用。

英文摘要:

The evolution of primordial collapsing clouds and formation of proto-Population III stars are investigated using three-dimensional ideal MHD simulation. We calculated the evolution of magnetized primordial clouds from the prestellar stage until the epoch after the proto-Population III star formation, spatially resolving both parsec-scale clouds and sub-AU scale protostars. The formation process of proto-population III star is characterized by the ratio of rotational to magnetic energy of the parent cloud. When the rotational energy is larger than the magnetic energy, fragmentation occurs in the collapsing primordial cloud before the proto-Population III star formation and binary or multiple system appears. Instead, when the magnetic energy is larger than the rotational energy, strong jet with >100km s^-1 is driven by circumstellar disk around the proto-population III star without fragmentation. Thus, even in the early universe, the magnetic field plays an important role in the star formation process.

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