作为等温气体扩散器的星系际细丝
Intergalactic Filaments as Isothermal Gas Cylinders
摘要：
利用宇宙学模拟在红移5，我们发现，从星系向外延伸的星系际细丝的重子丰富的核心通常形成等温的气体圆柱体的区域有利于他们的形成。中心气体密度通常是宇宙平均总密度的500倍，温度通常是10^4 K的1-2倍，刚好在莱曼α冷却层之上。这些发现表明，在决定这种结构方面，气体的流体动力学性质比暗物质更重要。值得注意的是，气体的温度和电离状态完全决定了等温圆柱体每单位长度的有限总质量。我们的发现可能对理解气体输运进入星系的“冷模式”机制有影响。
英文摘要：
Using a cosmological simulation at redshift 5, we find that the baryon-rich cores of intergalactic filaments extending outward from galaxies commonly form isothermal gas cylinders in regions favorable to their formation. The central gas density is typically about 500 times the cosmic mean total density, and the temperature is typically 1-2 times 10^4 K, just above the Lyman alpha cooling floor. These findings argue that the hydrodynamic properties of the gas are more important than the dark matter in determining this structure. It is noteworthy that the temperature and ionization state of the gas completely determine a finite total mass per unit length of an isothermal cylinder. Our findings may have implications for understanding the "cold mode" mechanism of gas transport into galaxies.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
