论文标题
在观察到的恒星质量函数中缺少低表面 - 亮度星系
Low-Surface-Brightness Galaxies are missing in the observed Stellar Mass Function
论文作者
论文摘要
我们使用Horizon Run 5（HR5）模拟产生的模拟调查研究了表面亮度（SB）极限对星系恒星质量功能（GSMF）的影响。我们将HR5星系与经验数据和其他宇宙学模拟进行比较，将HR5星系的恒星关系，GSMF和尺寸巨大的质量关系进行比较。模拟星系的平均SB是使用其有效半径，亮度和颜色计算的。为了检查宇宙SB调光效果，我们根据每个红移在单个模拟星系的频谱能量分布中计算$ K $ - 纠正，将$ K $ - 纠正应用于星系，并根据各种SB限制进行模拟调查。我们发现，GSMF在低质量端的SB极限受到显着影响。这种方法可以缓解从模拟获得的GSMF和观察值$ 0.625 \ le le z \ le 2 $之间的差异。我们还发现，一项具有SB选择极限的红移调查为$ \ weft<μ_r\ right>^e = $ 28 mag arcsec $ {}^{ - 2} $将错过20％的星系，$ m_ \ star^g = 10^g = 10^{9}}}在$ z = 0.9 $，1.1和1.9时，低表面 - 亮度星系的缺失分别在SB限制下增加到50％，70％和98％。
We investigate the impact of the surface brightness (SB) limit on the galaxy stellar mass functions (GSMFs) using mock surveys generated from the Horizon Run 5 (HR5) simulation. We compare the stellar-to-halo-mass relation, GSMF, and size-stellar mass relation of the HR5 galaxies with empirical data and other cosmological simulations. The mean SB of simulated galaxies are computed using their effective radii, luminosities, and colors. To examine the cosmic SB dimming effect, we compute $k$-corrections from the spectral energy distributions of individual simulated galaxy at each redshift, apply the $k$-corrections to the galaxies, and conduct mock surveys based on the various SB limits. We find that the GSMFs are significantly affected by the SB limits at a low-mass end. This approach can ease the discrepancy between the GSMFs obtained from simulations and observations at $0.625\le z\le 2$. We also find that a redshift survey with a SB selection limit of $\left<μ_r\right>^e =$ 28 mag arcsec${}^{-2}$ will miss 20% of galaxies with $M_\star^g=10^{9}~{\rm M_\odot}$ at $z=0.625$. The missing fraction of low-surface-brightness galaxies increases to 50%, 70%, and 98% at $z=0.9$, 1.1, and 1.9, respectively, at the SB limit.
