Mock catalogues of emission-line galaxies based on the local mass density in dark-matter only simulations
Mock catalogues of emission-line galaxies based on the local mass density in dark-matter only simulations
复制标题
基于仅暗物质模拟中的局部质量密度的发射线星系的模拟目录
DOI：
10.1093/mnras/stac124
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Takada Masahiro
中科院分区：
文献类型：
--
作者：
Osato Ken;Nishimichi Takahiro;Takada Masahiro
发射线星系空间成团的高精度测量是未来宇宙学光谱巡天的主要目标。ELG强辐射的来源是恒星形成星系中大质量短寿命恒星照射周围电离气体产生的星云辐射。因此，ELG更可能驻留在新形成的晕，这导致ELG数密度和物质密度场之间的非线性关系。为了估计宇宙学观测量的协方差矩阵，有必要产生许多独立的实现来模拟大调查体积的ELG分布。为此，我们提出了一种新的和快速的计划，以填充ELG在暗物质onlyN体模拟的基础上局域密度场。这种方法使模拟ELG目录的快速生产适用于验证分析方法和量化观测系统在即将到来的光谱调查，并可以填充ELG在中等高密度的地区，即使晕结构不能解决由于低分辨率。模拟的ELG的功率谱与流体动力学模拟的结果一致，直到相当小的尺度（），并且模拟的ELG更可能在非连续结构中发现，这与半解析和流体动力学模拟的结果一致。此外，我们解决了红移空间功率谱的模拟ELG。测得的多极矩模拟ELG清楚地表现出较弱的上帝之指的效果比那些物质由于下落运动对晕中心，而不是随机的维里运动晕内。
The high-precision measurement of spatial clustering of emission-line galaxies (ELGs) is a primary objective for upcoming cosmological spectroscopic surveys. The source of strong emission of ELGs is nebular emission from surrounding ionized gas irradiated by massive short-lived stars in star-forming galaxies. As a result, ELGs are more likely to reside in newly formed haloes and this leads to a non-linear relation between ELG number density and matter density fields. In order to estimate the covariance matrix of cosmological observables, it is essential to produce many independent realizations to simulate ELG distributions for large survey volumes. To this end, we present a novel and fast scheme to populate ELGs in dark-matter onlyN-body simulations based on local density field. This method enables fast production of mock ELG catalogues suitable for verifying analysis methods and quantifying observational systematics in upcoming spectroscopic surveys and can populate ELGs in moderately high-density regions even though the halo structure cannot be resolved due to low resolution. The power spectrum of simulated ELGs is consistent with results of hydrodynamical simulations up to fairly small scales (), and the simulated ELGs are more likely to be found in filamentary structures, which is consistent with results of semi-analytic and hydrodynamical simulations. Furthermore, we address the redshift-space power spectrum of simulated ELGs. The measured multipole moments of simulated ELGs clearly exhibit a weaker Finger-of-God effect than those of matter due to infalling motions towards halo centre, rather than random virial motions inside haloes.