从空洞到昏迷：局部宇宙中预处理的普遍性
From Voids to Coma: the prevalence of pre-processing in the local Universe
摘要：
我们研究的后发座超星系团，包括3505个星系超过500平方度的预处理的影响，通过量化的程度，恒星形成（SF）活动淬火作为环境的函数。我们使用Voronoi Tessellation的补充技术来测量密度场，并使用最小生成树来定义连续结构，从而测量SF活动作为局部密度和环境类型（簇，组，细丝和空隙）的函数，并量化环境对SF活动淬灭的贡献程度。我们的样本覆盖了恒星质量的两个数量级（10^8.5到10^11 Msun），因此我们追踪了环境对矮星系和大质量星系SF活动的影响，区分了所谓的“质量淬火”和“环境淬火”。环境驱动的淬火SF活动，测量相对于空星系，发生在长丝，集团和集群的程度越来越大，这种趋势适用于矮星系和大质量星系一样。使用g-r颜色也发现了类似的趋势，但在大质量星系中，由于内部尘埃消光的增加，星系质量仓之间的差异更加显著。大质量SF星系的SFR分布没有明显的环境依赖性，但在大多数环境中，矮SF星系的分布被发现是统计上不同的。预处理在低红移时起着重要的作用，因为环境驱动的星系演化影响了近一半的星系群环境，以及相当一部分的星系在更弥散的细丝中。我们的研究强调了需要对矮星系的敏感性，以将质量驱动与环境驱动的影响分开，并使用无偏见的SF活动示踪剂。
英文摘要：
We examine the effects of pre-processing across the Coma Supercluster, including 3505 galaxies over 500 sq deg, by quantifying the degree to which star-forming (SF) activity is quenched as a function of environment. We characterise environment using the complementary techniques of Voronoi Tessellation, to measure the density field, and the Minimal Spanning Tree, to define continuous structures, and so we measure SF activity as a function of local density and the type of environment (cluster, group, filament, and void), and quantify the degree to which environment contributes to quenching of SF activity. Our sample covers over two orders of magnitude in stellar mass (10^8.5 to 10^11 Msun), and consequently we trace the effects of environment on SF activity for dwarf and massive galaxies, distinguishing so-called "mass quenching" from "environment quenching". Environmentally-driven quenching of SF activity, measured relative to the void galaxies, occurs to progressively greater degrees in filaments, groups, and clusters, and this trend holds for dwarf and massive galaxies alike. A similar trend is found using g-r colours, but with a more significant disparity between galaxy mass bins driven by increased internal dust extinction in massive galaxies. The SFR distributions of massive SF galaxies have no significant environmental dependence, but the distributions for dwarf SF galaxies are found to be statistically distinct in most environments. Pre-processing plays a significant role at low redshift, as environmentally-driven galaxy evolution affects nearly half of the galaxies in the group environment, and a significant fraction of the galaxies in the more diffuse filaments. Our study underscores the need for sensitivity to dwarf galaxies to separate mass-driven from environmentally-driven effects, and the use of unbiased tracers of SF activity.
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