论文标题
H $α$调查的高红移宇宙学带有氧气线
High-redshift cosmology with oxygen lines from H$α$ surveys
论文作者
论文摘要
新一代的宇宙学实验将在光学/近红外频率下从ELGS上检测到H $α$线。其他排放线也将存在，该线可能来自相同的H $α$样本或完全构成新的Galaxy样品。我们的目标是评估H $α$星系调查中存在的$ z \ gtrsim2 $的星系的价值，并通过高度红移的Ultra -Violet和光学线路可识别，即OII线和OIII系列和OIII双打，与H $β$β$线结合使用。我们使用最先进的光度函数来估计OIIIB和OII ELG的数量密度。我们研究了这些高红移星系样品在宇宙学参数上的约束功能，例如BAO振幅，$ h（z）$，$ d _ {\ rm a}（z）$，$fσ_8（z）$，和$fσ_8（z）$，和$bσ_8（z）$用于不同的调查设计。我们提出了一个强大的科学案例，用于提取OIIIB样本，我们认为这是Redshift范围内的宇宙的独立探测$ 2-3 $。此外，我们表明OII样品可用于测量$ z = 3 $的结构的BAO和结构的增长；尽管它可能被击中，但它仍将提供有价值的层析成像信息。我们讨论了一个星系样本的科学潜力，到目前为止，该样品主要被认为是H $α$星系调查中的污染物。我们的发现表明，计划的H $α$调查应包括在其管道中提取这些氧气样本，以增强其对宇宙学的科学影响。
A new generation of cosmological experiments will spectroscopically detect the H$α$ line from ELGs at optical/near-infrared frequencies. Other emission lines will also be present, which may come from the same H$α$ sample or constitute a new galaxy sample altogether. Our goal is to assess the value, for cosmological investigation, of galaxies at $z\gtrsim2$ present in H$α$ galaxy surveys and identifiable by the highly redshifted ultra-violet and optical lines - namely the OII line and the OIII doublet in combination with the H$β$ line. We use state-of-the-art luminosity functions to estimate the number density of OIIIb and OII ELGs. We study the constraining power of these high-redshift galaxy samples on cosmological parameters such as the BAO amplitude, $H(z)$, $D_{\rm A}(z)$, $fσ_8(z)$, and $bσ_8(z)$ for different survey designs. We present a strong science case for extracting the OIIIb sample, which we consider as an independent probe of the Universe in the redshift range $2-3$. Moreover, we show that the OII sample can be used to measure the BAO and growth of structure above $z=3$; albeit it may be shot-noise dominated, it will nonetheless provide valuable tomographic information. We discuss the scientific potential of a sample of galaxies which, so far, has been mainly considered as a contaminant in H$α$ galaxy surveys. Our findings indicate that planned H$α$ surveys should include the extraction of these oxygen-line samples in their pipeline, to enhance their scientific impact on cosmology.
