星系颜色和晕浓度的相关：星系整合的可调晕模型
Correlating galaxy colour and halo concentration: A tunable Halo Model of galactic conformity
摘要：
我们扩展的晕占领分布（HOD）框架，以产生模拟星系目录表现出不同程度的“银河一致性”，这已成为一个潜在的强大的探测星系演化的环境影响。我们的模型相关的星系颜色在一个组中的共同的父暗晕的浓度通过“组淬火效率”$ρ$，使老年人，更集中的晕$\textit{at fixed mass}$优先主机红星系。我们发现，对于一个特定的值$ρ$，这1-halo一致性匹配相应的测量组目录的基础上斯隆数字巡天。我们的模拟还显示一致性在大分离孤立的对象，可能是晕组装偏见的印记。然而，一项详细的研究--使用消除了装配偏差的模拟，同时保持1-halo一致性不变--揭示了一个相当微妙的情况。在分离$\lesssim 4$ Mpc，一致性主要是由最大晕主导的1-晕效应，并且是$\textit{not}$组装偏差的稳健指标。只有在非常大的分离（$\gtrsim 8$ Mpc），真正的2-晕一致性，由小晕的组装偏差，明显表现。我们用标准的Halo模型术语解释所有这些趋势。我们的模型打开了大门，参数化HOD分析，自洽占银河系的一致性在所有尺度。
英文摘要：
We extend the Halo Occupation Distribution (HOD) framework to generate mock galaxy catalogs exhibiting varying levels of "galactic conformity", which has emerged as a potentially powerful probe of environmental effects in galaxy evolution. Our model correlates galaxy colours in a group with the concentration of the common parent dark halo through a "group quenching efficiency" $ρ$ which makes older, more concentrated halos $\textit{at fixed mass}$ preferentially host redder galaxies. We find that, for a specific value of $ρ$, this 1-halo conformity matches corresponding measurements in a group catalog based on the Sloan Digital Sky Survey. Our mocks also display conformity at large separations from isolated objects, potentially an imprint of halo assembly bias. A detailed study - using mocks with assembly bias erased while keeping 1-halo conformity intact - reveals a rather nuanced situation, however. At separations $\lesssim 4$Mpc, conformity is mainly a 1-halo effect dominated by the largest halos and is $\textit{not}$ a robust indicator of assembly bias. Only at very large separations ($\gtrsim 8$Mpc) does genuine 2-halo conformity, driven by the assembly bias of small halos, manifest distinctly. We explain all these trends in standard Halo Model terms. Our model opens the door to parametrized HOD analyses that self-consistently account for galactic conformity at all scales.
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