模拟人口III星的生存到今天
Modeling the survival of Population III stars till present day
摘要：
最近的数值模拟表明，一小部分原始恒星有可能从它们的起源星团中被弹射出来。我们探讨的可能性，其中一些可以保留在主序列，直到目前的时代。我们开发了一个半解析模型的宇宙学模拟结果的指导下，研究这些原恒星的质量吸积作为原始恒星质量的函数，以及其他参数，如角动量和重力阻力，由于周围的气体。我们还探讨了一些原恒星是否仍然足够低的质量和长寿的生存到今天。这要求原恒星从恒星形成区被喷射出来，而它们的质量小于$0.8\,M_{\odot}$。假设原恒星通过球形邦迪-霍伊尔吸积从周围介质中获得质量，我们表明，波普III原恒星，最初形成在一定范围内的质量和喷射速度大于逃逸速度可能会生存到今天的主要序列。因此，它们甚至可能在我们的银河系或其卫星中找到。我们的计算还显示，没有从母气云中喷出的原恒星会吸积大量的气体。我们预测这些黑洞的质量会大到足以成为黑洞的前身。
英文摘要：
Recent numerical simulations have suggested the probability of a fraction of the primordial stars to be ejected from the cluster of their origin. We explore the possibility that some of these can remain on the main sequence till the present epoch. We develop a semi-analytical model guided by results of cosmological simulations to study the mass accretion by these protostars as a function of the original stellar mass, and other parameters such as angular momentum and gravitational drag due to ambient gas. We also explore whether some of the protostars remain sufficiently low-mass and long-lived to survive to the present day. This requires that the protostars are ejected from the star forming region while their mass is less than $0.8\,M_{\odot}$. Assuming the protostars gain mass via the spherical Bondi-Hoyle accretion from the ambient medium, we show that Pop III protostars that initially form within a certain range of mass and are ejected with velocity larger than the escape velocity may survive to the present day on the main sequence. Thus, they may even be found in our Milky Way or its satellites. Our calculations also reveal that protostars that do not get ejected from the parent gas cloud accrete large amount of gas. We predict that these can become massive enough to be progenitors of black holes.
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