论文标题
计算机上的宇宙电源：重新离子时期对光晕浓度的重新离子
Cosmic Reionization On Computers: Baryonic Effects on Halo Concentrations During the Epoch of Reionization
论文作者
论文摘要
重子都通过绝热收缩来增加光晕浓度，并通过反馈过程驱逐质量。然而，在电离时期期间，辐射场如何影响暗物质光环中浓度的演变。我们研究了在电离时期的重量化学在计算机模拟（CROC）模拟上修改暗物质光晕的结构。我们使用两种不同的光晕浓度度量来量化效果。我们比较了完整物理模拟和仅黑物质模拟之间匹配的光晕浓度，其初始条件在$ 5 \ leq z \ leq 9 $之间相同。完整物理模拟中的重子确实向中心拉动物质，与仅黑色含量模拟相比，最大的循环速度增加了。但是，它们的总体效果远低于所有重心浓缩的所有重子，这表明加热过程有效抵消了冷却效应。最后，我们表明，在$ z \大约5 $下对光环浓度的重态效应对电离历史的环境变化相对不敏感。这些结果与在电离时期期间的星系 - 哈洛连接模型有关。
Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration in dark matter halos. We investigate how baryonic physics during the epoch of reionization modify the structure of dark matter halos in the Cosmic Reionization On Computers (CROC) simulations. We use two different measures of halo concentration to quantify the effects. We compare concentrations of halos matched between full physics simulations and dark-matter-only simulations with identical initial conditions between $5 \leq z \leq 9$. Baryons in full physics simulations do pull matter towards the center, increasing the maximum circular velocity compared to dark-matter-only simulations. However, their overall effects are much less than if all the baryons were simply centrally concentrated indicating that heating processes efficiently counteract cooling effects. Finally, we show that the baryonic effects on halo concentrations at $z\approx5$ are relatively insensitive to environmental variations of reionization history. These results are pertinent to models of galaxy-halo connection during the epoch of reionization.
