论文标题
大规模湍流驱动器调节高红移气体的星系中的恒星形成
Large-scale turbulent driving regulates star formation in high-redshift gas-rich galaxies
论文作者
论文摘要
什么是恒星形成的问题是一个长期存在的问题。为了调查此问题，我们对银河系的一个千欧立方体部分进行了模拟，并具有三种恒星反馈：HII区域的形成，超新星的爆炸和紫外线加热。我们表明，恒星反馈足以将平均恒星形成率（SFR）降低到像星系一样的乳状通道中的Schmidt-kennicutt法律的水平，但在高红移气体富含气的星系中不建议将另一种支持添加。我们研究了湍流的外部驾驶，例如大银河尺度产生的湍流是否会在观察到的水平下降低SFR。假设Toomre参数接近观测值所建议的接近1，我们推断出我们认为应平行于银河盘平面应用的典型湍流强迫。当我们的模拟中应用这种强迫时，我们的模拟中的SFR紧密遵循Schmidt-Kennicutt的关系。我们发现，速度分散液具有强烈的各向异性，速度分散率与银河系平面旁边高达10倍的速度10倍。
The question of what regulates star formation is a long standing issue. To investigate this issue, we run simulations of a kiloparsec cube section of a galaxy with three kinds of stellar feedback: the formation of HII regions, the explosion of supernovae, and the UV heating. We show that stellar feedback is sufficient to reduce the averaged star formation rate (SFR) to the level of the Schmidt- Kennicutt law in Milky-Way like galaxies but not in high-redshift gas rich galaxies suggesting that another type of support should be added. We investigate whether an external driving of the turbulence such as the one created by the large galactic scales could diminish the SFR at the observed level. Assuming that the Toomre parameter is close to 1 as suggested by the observations, we infer a typical turbulent forcing that we argue should be applied parallel to the plane of the galactic disc. When this forcing is applied in our simulations, the SFR within our simulations closely follows the Schmidt- Kennicutt relation. We found that the velocity dispersion is strongly anisotropic with the velocity dispersion alongside the galactic plane being up to 10 times larger than the perpendicular velocity.
