标题： 利用未来红移巡天探测暗能量：近红外发射线与宽带选择的比较 显示英文标题

标题： Probing dark energy with future redshift surveys: A comparison of emission line and broad band selection in the near infrared

摘要： 未来的星系巡天将在红移区间$0.5<z<2$使用近红外相机和光谱仪绘制星系分布图。 此类巡天的主要科学目标是通过测量宇宙的大尺度结构来限制暗能量的本质。 这需要一个能够最大化巡天有用体积的暗物质基底示踪体。 我们研究了两种潜在的巡天选择方法：基于\ha 线的发射线样本和H波段选择的样本。 我们使用\galform 星系形成模型的两个已发表版本，提出了这些星系丰度和聚类的预测结果。 我们的模型预测，\ha 选择的星系倾向于避开大质量暗物质晕，而是追踪周围的细丝状结构；而H波段选择的星系则位于最高质量的晕中。 这对由于引力不稳定性导致的涨落增长速率的测量具有影响。 我们利用模拟星表比较了一系列巡天配置所采样的有效体积。 仅举两例：红移巡天到$H_{\rm AB}=22$会探测到一个有效体积，该体积比$\logfha > -15.4$的\ha 巡天所探测到的体积大$\sim 5-10$倍；对于\ha 样本，要使其有效体积具有竞争力，至少需要$\logfha = -16$的流量限制。 显示英文摘要

摘要： Future galaxy surveys will map the galaxy distribution in the redshift interval $0.5<z<2$ using near-infrared cameras and spectrographs. The primary science goal of such surveys is to constrain the nature of the dark energy by measuring the large-scale structure of the Universe. This requires a tracer of the underlying dark matter which maximizes the useful volume of the survey. We investigate two potential survey selection methods: an emission line sample based on the \ha line and a sample selected in the H-band. We present predictions for the abundance and clustering of such galaxies, using two published versions of the \galform galaxy formation model. Our models predict that \ha selected galaxies tend to avoid massive dark matter haloes and instead trace the surrounding filamentary structure; H-band selected galaxies, on the other hand, are found in the highest mass haloes. This has implications for the measurement of the rate at which fluctuations grow due to gravitational instability. We use mock catalogues to compare the effective volumes sampled by a range of survey configurations. To give just two examples: a redshift survey down to $H_{\rm AB}=22$ samples an effective volume that is $\sim 5-10$ times larger than that probed by an \ha survey with $\logfha > -15.4$; a flux limit of at least $\logfha = -16$ is required for an \ha sample to become competitive in effective volume.