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arXiv 2201.07244astro-ph.GAastro-ph.SR
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恒星风的机械反馈及其在高红移星系形成中的应用

Mechanical feedback from stellar winds with an application to galaxy formation at high redshift

Yvonne A. Fichtner, Luca Grassitelli, Emilio Romano-Díaz, Cristiano Porciani

摘要:

我们计算不同的恒星演化轨迹,以量化的能量,质量和金属产生的大规模主序星和主序星后风。我们的目的是调查的影响的二进制系统和金属度依赖的初始旋转速度分布的反馈恒星风。我们发现显着的变化相比,常用的非旋转,单星的情况。最大的差异是明显的低金属,其中机械能预算大幅增加。以建立最大的(即忽略近拱星环境中的耗散)风对星系形成早期阶段的影响,我们用我们新的反馈估计来模拟红移为3的亚$L_*$星系的形成和演化(由质量为$1.8\times 10^{11}$ M $_\odot$的暗物质晕托管),并将结果与仅考虑超新星(SN)反馈的模拟结果进行比较。考虑到恒星风持续不断的能量注入,恒星的总质量、金属含量、恒星形成速率的突然性以及流出的气体质量都会降低。然而,我们的数值实验表明,旋转和双星风的增强机械反馈对最相关的星系性质的影响有限,相比非旋转的单星情况。最终,我们研究了风中夹带的金属和SNe喷射的金属之间的相对丰度,发现它在模拟星系及其周围的晕中几乎保持不变。

英文摘要:

We compute different sets of stellar evolutionary tracks in order to quantify the energy, mass, and metals yielded by massive main-sequence and post-main-sequence winds. Our aim is to investigate the impact of binary systems and of a metallicity-dependent distribution of initial rotational velocities on the feedback by stellar winds. We find significant changes compared to the commonly used non-rotating, single-star scenario. The largest differences are noticeable at low metallicity, where the mechanical-energy budget is substantially increased. So as to establish the maximal (i.e. obtained by neglecting dissipation in the near circumstellar environment) influence of winds on the early stages of galaxy formation, we use our new feedback estimates to simulate the formation and evolution of a sub-$L_*$ galaxy at redshift 3 (hosted by a dark-matter halo with a mass of $1.8\times 10^{11}$ M$_\odot$) and compare the outcome with simulations in which only supernova (SN) feedback is considered. Accounting for the continuous energy injection by winds reduces the total stellar mass, the metal content, and the burstiness of the star-formation rate as well as of the outflowing gas mass. However, our numerical experiment suggests that the enhanced mechanical feedback from the winds of rotating and binary stars has a limited impact on the most relevant galactic properties compared to the non-rotating single-star scenario. Eventually, we look at the relative abundance between the metals entrained in winds and those ejected by SNe and find that it stays nearly constant within the simulated galaxy and its surrounding halo.

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