AI 中文总结
本文利用HETDEX PDR1目录构建体积限制样本，在两个主要区域的三个光度区间获取星系数据。通过分析样本功率谱与模拟数据对比，得出暗物质晕质量及相关特性，为后续红移空间畸变等分析提供基础，精确测量低红移区域聚类。
AI 中文摘要
Hobby-Eberly望远镜暗能量实验（HETDEX）公开数据发布1（PDR1）目录包含通过前所未有的无目标光谱调查在 \(z \le 0.48\) 范围内分布于 \(540\) 平方度的五十万个发射线选择的[OII]星系。本文在“春季”和“秋季”两个主要区域的三个光度区间内从PDR1构建体积限制样本。各区间星系数量从11354到64794不等，数密度 \(\bar{n}\simeq (2 - 5)\times10^{-3}~h^3~\mathrm{Mpc}^{-3}\)，高于典型发射线星系宇宙学光谱调查五到十倍。从这些样本得出的单极和四极功率谱与基于平坦 \(\Lambda\)CDM模型的Uchuu模拟的模拟功率谱以及普朗克宇宙微波背景数据的宇宙学参数在所有测量波数（\(0.01 < k < 0.7~h~\mathrm{Mpc}^{-1}\)）上高度一致。功率谱振幅与特征暗物质晕质量 \(\log(M_0~[h^{-1}M_{\odot}])\simeq 11.9 - 12.3\) 一致，晕质量对[OII]光度有弱依赖，\(M_0\propto L^a\)，斜率 \(a = 0.37\pm0.10\)。最佳拟合模拟表明样本中约13%的[OII]星系位于次晕中。本文提出的新的、高密度的潜在物质分布示踪剂为低红移区域对结构晚期生长敏感的聚类提供了精确测量。这些样本将为即将进行的红移空间畸变效应、星系 - 晕连接以及与外部低红移探测器的交叉相关分析奠定基础。
英文摘要
The catalog from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Public Data Release 1 (PDR1) contains half a million emission-line-selected [OII] galaxies spread across $540~\mathrm{deg}^2$ at $z \le 0.48$ from HETDEX's unprecedented untargeted spectroscopic survey. In this paper, we construct volume-limited samples from PDR1 in three luminosity bins across the two main fields: "Spring'' and "Fall''. The numbers of galaxies in the bins range from 11,354 to 64,794 and number densities, $\bar{n}\simeq (2-5)\times10^{-3}~h^3~\mathrm{Mpc}^{-3}$, are higher than those of typical cosmological spectroscopic surveys of emission-line galaxies by a factor of five to ten. The monopole and quadrupole power spectra derived from these samples are in excellent agreement with the mock power spectra from the Uchuu simulation based on a flat $Λ$CDM model and the cosmological parameters from the Planck cosmic microwave background data, at all wavenumbers used for the measurement ($0.01<k<0.7~h~\mathrm{Mpc}^{-1}$). We find that the power spectrum amplitudes are consistent with a characteristic dark matter halo mass of $\log(M_0~[h^{-1}M_{\odot}])\simeq 11.9$-$12.3$, with the halo mass showing a weak dependence on [OII] luminosity, $M_0\propto L^a$, increasing with a slope of $a = 0.37\pm0.10$. The best-fit mock suggests that approximately 13 percent of the [OII] galaxies in our sample reside in subhalos. The new, high-density tracers of the underlying matter distribution presented in this paper provide precise measurements of clustering in a low-redshift regime sensitive to the late-time growth of structures. These samples will form the basis for forthcoming analyses of the redshift-space distortion effect, galaxy-halo connection, and cross-correlations with external low-redshift probes.
Comments23 pages,17 figures, 1 table
