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arXiv 2103.11063astro-ph.COastro-ph.GA
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Nancy Grace Roman空间望远镜发射线星系的线偏差和晕占据分布

Linear bias and halo occupation distribution of emission line galaxies from Nancy Grace Roman Space Telescope

Zhongxu Zhai, Yun Wang, Andrew Benson, Chia-Hsun Chuang, Gustavo Yepes

摘要:

利用Nancy Grace Roman空间望远镜高纬光谱巡天(HLSS)的半解析模型{ \it Galacticus},测量了H $α$和[OIII]发射线星系(ELG)的线性星系偏差.我们计算了星系在位形空间中的两点统计量,并测量了$10\sim50 h^{-1}$ Mpc尺度下的线性偏差。我们采用不同的选择算法来研究罗马线通量切割的影响,以及用于校准Galacticus的尘埃模型的效果,对偏差测量。我们认为星系的H $α$和[OIII]的红移范围$1<z<3$,指定的当前基线为罗马HLSS的排放量。我们发现H $α$和[OIII] ELG的线性偏置可以表示为相对于红移的线性函数:H $α$ $(1<z<2)$为$b \simeq 0.88z+0.49$,[OIII] $(2<z<3)$为$b \simeq 0.98z+0.49$.我们还测量了这些H $α$和[OIII]发射线星系的晕占据分布,以了解它们在暗物质晕中的分布。我们的研究结果提供了关键的输入,使罗马的暗能量和宇宙学约束的可靠预测。

英文摘要:

We present measurements of the linear galaxy bias of H$α$ and [OIII] emission line galaxies (ELGs) for the High Latitude Spectroscopic Survey (HLSS) of Nancy Grace Roman Space Telescope, using galaxy mocks constructed using semi-analytical model for galaxy formation, {\it Galacticus}, with a large cosmic volume and redshift coverage. We compute the two-point statistics of galaxies in configuration space and measure linear bias within scales of $10\sim50 h^{-1}$Mpc. We adopt different selection algorithms to investigate the impact of the Roman line flux cut, as well as the effect of dust model used to calibrate Galacticus, on the bias measurements. We consider galaxies with H$α$ and [OIII] emissions over the redshift range $1<z<3$, as specified by the current baseline for the Roman HLSS. We find that the linear bias for the H$α$ and [OIII] ELGs can be expressed as a linear function with respect to redshift: $b \simeq 0.88z+0.49$ for H$α$ $(1<z<2)$, and $b \simeq 0.98z+0.49$ for [OIII] $(2<z<3)$. We have also measured the Halo Occupation Distributions of these H$α$ and [OIII] emission line galaxies to understand their distribution within dark matter halos. Our results provide key input to enable the reliable forecast of dark energy and cosmology constraints from Roman.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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