论文标题
宇宙射线在银河流出的早期阶段的作用
Role of cosmic rays in the early stages of galactic outflows
论文作者
论文摘要
使用理想化的设置，我们调查了宇宙射线（CRS）在银河流出的早期阶段的动态作用，用于Halo Masses的星系$ 10^{8} $，$ 10^{11} $和$ 10^{12} {12} $ $ M_ \ m_ \ odot $。流出是从银河系磁盘中的一个中央区域推出的，我们考虑了三个不同的恒星形成率（$ 0.1 $，$ 1 $，$ 10 $ $ M _ {\ odot} $ yr $^{ - 1} $，而不是$ 50 $ 50 $。我们确定气体的温度分布，发现CRS可以降低冲击气体的温度，这与先前的结果一致。但是，我们表明CRS对流出的质量负载没有任何明显的影响。我们发现CRS可以减少流出的大小，这与先前关于CRS有效动态影响的主张相矛盾。但是，它与宇宙射线驱动的Blastwave以及恒星风的早期理论模型一致。我们讨论结果对CR注射处方的依赖性，并将其与较早的研究进行比较。我们得出的结论是，在银河流出的早期阶段，CRS的动态作用并不重要。
Using an idealized set-up, we investigate the dynamical role of cosmic rays (CRs) in the early stages of galactic outflows for galaxies of halo masses $10^{8}$, $10^{11}$ and $10^{12}$ $M_\odot$. The outflow is launched from a central region in the galactic disk where we consider three different constant star formation rates ($0.1$, $1$, and $10$ $M_{\odot}$ yr$^{-1}$) over a dynamical timescale of $50$ Myr. We determine the temperature distribution of the gas and find that CRs can reduce the temperature of the shocked gas, which is consistent with previous results. However, we show that CRs do not have any noticeable effect on the mass loading by the outflow. We find that CRs can reduce the size of the outflow, which contradicts previous claims of efficient dynamical impact of CRs; however, it is consistent with earlier theoretical models of cosmic ray driven blastwave as well as stellar wind. We discuss the dependence of our results on CR injection prescriptions and compare them with earlier studies. We conclude that in the early stages of galactic outflows the dynamical role of CRs is not important.
