论文标题
通过新的数值星系目录（$ν^2 $ gc）来量化现场差异对H $α$光度的影响
Quantifying the effect of field variance on the H$α$ luminosity function with the New Numerical Galaxy Catalogue ($ν^2$GC)
论文作者
论文摘要
我们基于半分析星系形成模型，即新的数值星系目录（$ν^2 $ gc），构建了H $α$发射器（HAE）的模型。在本文中，我们报告了对HAE分布的现场差异的估计。通过从星系的恒星形成速率中计算出H $α$的光度，我们的模型很好地复制了观察到的H $α$光度函数（LF）$ z = 0.4 $。 $ν^2 $ GC的大量量使得可以检查HAE在（411.8 MPC）$^3 $中的空间分布中。 $ z = 0.4 $ he的表面密度与$ l _ {\ rmhα} \ geq 10^{40} $ erg s $^{ - 1} $ is 308.9 v $^{ - 2} $。我们已经确认，HAE是宇宙大规模结构的有用示踪剂，因为在簇和丝状结构上具有显着的过重（$> $ 5 $σ$）。 $ \ sim $ 2度$^2 $的调查区域内的H $α$ LFS（以前的观察研究典型）显示出明显的现场差异，最高可达$ \ sim $ 1 DEX。根据我们的模型，可以估计给定调查区域内H $α$ LFS的差异。
We construct a model of H$α$ emitters (HAEs) based on a semi-analytic galaxy formation model, the New Numerical Galaxy Catalog ($ν^2$GC). In this paper, we report our estimate for the field variance of the HAE distribution. By calculating the H$α$ luminosity from the star-formation rate of galaxies, our model well reproduces the observed H$α$ luminosity function (LF) at $z=0.4$. The large volume of the $ν^2$GC makes it possible to examine the spatial distribution of HAEs over a region of (411.8 Mpc)$^3$ in the comoving scale. The surface number density of $z=0.4$ HAEs with $L_{\rm Hα} \geq 10^{40}$ erg s$^{-1}$ is 308.9 deg$^{-2}$. We have confirmed that the HAE is a useful tracer for the large-scale structure of the Universe because of their significant overdensity ($>$ 5$σ$) at clusters and the filamentary structures. The H$α$ LFs within a survey area of $\sim$2 deg$^2$ (typical for previous observational studies) show a significant field variance up to $\sim$1 dex. Based on our model, one can estimate the variance on the H$α$ LFs within given survey areas.
