发表机构
University of California, Riverside; California Institute of Technology; MIT Kavli Institute for Astrophysics and Space Research; Aalto University; University of Helsinki; Space Telescope Science Institute; University of California, Santa Barbara; Cosmic Dawn Center (DAWN); Rochester Institute of Technology（加州大学河滨分校; 加州理工学院; 麻省理工学院卡弗里天体物理与空间研究所; 阿尔托大学; 赫尔辛基大学; 太空望远镜科学研究所; 加州大学圣塔芭芭拉分校; 宇宙黎明中心; 罗切斯特理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用COSMOS2020数据，发现星系恒星质量与恒星形成活动对宇宙网环境的依赖性随红移演变：z<1时致密环境抑制恒星形成，z>2时趋势反转，揭示了环境作用的动态变化。
AI 中文摘要
我们利用COSMOS2020星表，在四个红移区间（z=0.4至z=4）内，基于质量完备星系样本，研究了恒星质量与恒星形成活动对宿主大尺度结构拓扑的依赖性。通过将多尺度形态滤波器应用于星系密度图，识别出宇宙网组分（星系团、纤维状结构和场），并利用朋友的朋友（FoF）算法为每个星系分配群组成员身份（中心星系、卫星星系、孤立星系）。在z<1时，我们发现恒星质量向更致密结构方向增加，这主要由中心星系和卫星星系驱动，场星系与星系团之间的差异高达约0.35 dex。在这些红移处，星系团中的恒星形成率（SFR）相比场星系被抑制约0.1 dex，尤其是对中心星系而言，而恒星形成星系的SFR对宿主结构类型的依赖性则弱得多，表明被熄灭的星系群主要驱动了观测到的环境依赖性。比恒星形成率（sSFR）在z<1时对星系团中的中心星系表现出最强的下降，这与致密环境中增强的熄灭效应一致。在1<z<2时，恒星形成活动基本与环境无关，表明大尺度结构的作用处于过渡阶段。在z>2时，我们观察到从场星系到星系团星系的SFR（约+0.1 dex）和sSFR（约+0.13 dex）有轻微增加，暗示在早期宇宙时期环境趋势可能出现反转。这些结果凸显了环境对星系演化影响的演变性，并为即将开展的大视场巡天进行更深入的研究奠定了基础。
英文摘要
We investigate the dependence of stellar mass and star formation activity on the topology of hosting large-scale structures using mass-complete galaxy samples in four redshift bins spanning from z = 0.4 to z = 4 using the COSMOS2020 catalog. Cosmic web components (clusters, filaments, and field) are identified by applying the Multiscale Morphology Filter to galaxy density maps, and group memberships (central, satellite, isolated) are assigned to each galaxy by the Friends of Friends (FoF) algorithm. Out to z < 1, we find that stellar mass increases toward denser structures, driven primarily by central and satellite galaxies, with differences up to ~0.35 dex between field and clusters. At these redshifts, star formation rate (SFR) is suppressed by ~0.1 dex in clusters compared to field galaxies, particularly for centrals, while the SFR of star-forming galaxies shows a much weaker dependence on the type of host structure, indicating that the quenched population primarily drives the observed environmental dependence. Specific SFR (sSFR) shows the strongest decline for centrals in clusters at z<1, consistent with enhanced quenching in dense environments. At 1<z<2, star formation activity becomes largely independent of environment, suggesting a transitional regime in the role of large-scale structure. At z>2, we observe a mild increase in SFR (~+0.1 dex) and sSFR (~+0.13 dex) from field to cluster galaxies, pointing to a possible reversal of environmental trends during early cosmic epochs. These results highlight the evolving influence of environment on galaxy evolution and set the stage for deeper investigations with upcoming wide-field surveys.
Comments15 pages, 7 figures, 1 table,
