操纵暗晕：为什么分层的星系形成与由内而外的薄盘构造一致？
Rigging dark halos: why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs?
摘要：
最先进的流体动力学模拟表明，通过暗物质晕维里球的气体流入是集中的（即具有优选的流入方向）、一致的（即其方向在时间上是稳定的）和放大的（即其平流比角动量的幅度随时间增加）。我们解释这是一个结果的动力学的宇宙网络附近的晕，它产生稳定的，角动量丰富的冷气体的对流流入。在大尺度上，邻近斑块内的动力学将物质从周围的空隙中驱逐出来，进入墙壁和细丝，然后最终被吸积到维里化的暗物质晕上。由于这些壁/细丝构成了不对称空隙的边界，它们获得了净横向运动，这解释了来自更远处的后来的下落的角动量丰富的性质。我们推测，这种大规模的驱动一致性解释了为什么冷流是如此有效地建立高红移薄盘从内到外。
英文摘要：
State-of-the-art hydrodynamical simulations show that gas inflow through the virial sphere of dark matter halos is focused (i.e. has a preferred inflow direction), consistent (i.e. its orientation is steady in time) and amplified (i.e. the amplitude of its advected specific angular momentum increases with time). We explain this to be a consequence of the dynamics of the cosmic web within the neighbourhood of the halo, which produces steady, angular momentum rich, filamentary inflow of cold gas. On large scales, the dynamics within neighbouring patches drives matter out of the surrounding voids, into walls and filaments before it finally gets accreted onto virialised dark matter halos. As these walls/filaments constitute the boundaries of asymmetric voids, they acquire a net transverse motion, which explains the angular momentum rich nature of the later infall which comes from further away. We conjecture that this large-scale driven consistency explains why cold flows are so efficient at building up high redshift thin discs from the inside out.
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