论文标题
碎裂和积聚会影响恒星的初始质量功能吗？
Do fragmentation and accretion affect the stellar Initial Mass Function?
论文作者
论文摘要
尽管在银河系中，恒星初始质量功能（IMF）似乎接近通用，但在原始宇宙中，强烈怀疑它在分子氢冷却较低的效率较低，并且气体温度的效率较低，并且在这些极端情况下的气温可能更高。在本文中，我们探讨了气温的变化是否影响恒星的IMF考虑碎片化和积聚。碎裂行为主要取决于状态方程中的牛仔裤质量，在这种状态方程中，由于尘埃不透明，从大约等温度到绝热状态的过渡。状态方程中此过渡时的牛仔裤质量始终非常相似，与初始温度无关，因此片段的初始质量非常相似。另一方面，积聚的温度取决于温度。我们认为，后者成为高于5-7％的恒星形成效率的主要过程，从而增加了恒星的平均质量。
While the stellar Initial Mass Function (IMF) appears to be close to universal within the Milky Way galaxy, it is strongly suspected to be different in the primordial Universe, where molecular hydrogen cooling is less efficient and the gas temperature can be higher by a factor of 30. In between these extreme cases, the gas temperature varies depending on the environment, metallicity and radiation background. In this paper we explore if changes of the gas temperature affect the IMF of the stars considering fragmentation and accretion. The fragmentation behavior depends mostly on the Jeans mass at the turning point in the equation of state where a transition occurs from an approximately isothermal to an adiabatic regime due to dust opacities. The Jeans mass at this transition in the equation of state is always very similar, independent of the initial temperature, and therefore the initial mass of the fragments is very similar. Accretion on the other hand is strongly temperature dependent. We argue that the latter becomes the dominant process for star formation efficiencies above 5 - 7 %, increasing the average mass of the stars.
