通过宇宙学模拟红移巡天中的星系团演化追踪发光红外星系群体
Tracing luminous infrared galaxy populations through cluster evolution in a cosmological mock redshift survey
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中文总结 AI 辅助
研究人员基于MultiDark-Planck 2模拟构建GARDENS-Wide模拟红移巡天，分析原星系团中星系群体的红移演化，为TolTEC大尺度结构巡天提供观测预测。
中文摘要 AI 辅助
我们提出了GARDENS-Wide，这是一项基于MultiDark-Planck 2暗物质晕模拟的新的100平方度尘埃恒星形成星系群体的模拟红移巡天。该模拟重现了500μm、1.1、1.4和2.0mm处观测到的多波段数计数。巨大的模拟区域使我们能够识别引力束缚系统、追踪它们的并合历史，并量化其星系含量和结构范围的红移演化。我们发现星系团原初体中星系群体的分数贡献存在显著演化：恒星形成星系在低红移时占成员的约35%，在z~2时增加至60-65%，在z~5时下降至约20%；发光红外星系（LIRGs）贡献约20-40%，在z~2附近达到峰值；超发光红外星系（ULIRGs）仍处于次要地位，超超发光红外星系（HyLIRGs）则较为罕见。我们将原星系团半径定义为从中心晕到最远成员晕的最大三维共动距离，发现原星系团在宇宙时间中显著收缩，从高红移时的>20共动Mpc缩小到z~0时的几个Mpc；在z>1.5的富原星系团中，超发光红外星系（ULIRGs）变得越来越集中于中心。我们为TolTEC大尺度结构巡天提供了观测预测。
英文摘要
We present GARDENS-Wide, a new 100 square degree mock redshift survey of the dusty star-forming galaxy population based on the MultiDark-Planck 2 dark-matter halo simulation. The mock reproduces observed multiwavelength number counts at 500 $μ$m, 1.1, 1.4 and 2.0 mm. The large simulated area enables us to identify gravitationally bound systems, trace their assembly histories, and quantify the redshift evolution of their galaxy content and structural extent. We find strong evolution in the fractional contribution of galaxy populations within cluster progenitors. Star-forming galaxies account for ~35 per cent of members at low redshift, increasing to 60-65 per cent at $z\sim2$ and declining to ~20 per cent by $z\sim5$. LIRGs contribute ~20-40 per cent, peaking near $z\sim2$, while ULIRGs remain subdominant and HyLIRGs are rare. We measure proto-cluster radii as the maximum 3D comoving distance from the central halo to the most distant member halo. Proto-clusters contract significantly over cosmic time, from >20 comoving Mpc at high redshift to a few Mpc at $z\sim0$. ULIRGs become increasingly centrally concentrated at $z>1.5$ in rich proto-clusters. We provide observational predictions for the TolTEC Large-Scale Structure survey.
