标题： LATIS：来自星系-星系和星系- Ly$z \sim 2.5$聚类的 $α$ 星系晕连接约束 显示英文标题

标题： LATIS: Constraints on the Galaxy-halo Connection at $z \sim 2.5$ from Galaxy-galaxy and Galaxy-Ly$α$ Clustering

摘要： 星系与暗物质晕之间的联系通常通过恒星质量-晕质量（SMHM）关系来量化。光学和近红外成像巡天基于星系丰度和角关联函数的测量，得出了关于演化的SMHM关系的一致图像。 在$z \gtrsim 2$波长上的光谱巡天也可以通过星系自相关函数以及通过透视线方向上观测到的星系与Ly$\alpha$吸收之间的交叉关联来限制SMHM关系；然而，这类研究非常少，并且产生了一些意想不到或结论不明确的结果。 我们使用来自Lyman-alpha Tomography IMACS巡天（LATIS）的$\sim$3000条光谱，测量了$z\sim2.5$星系在四个恒星质量区间内的星系-星系和星系-Ly$\alpha$关联函数，这些区间覆盖了$10^{9.2} \lesssim M_* / M_{\odot} \lesssim 10^{10.5}$范围。 对MultiDark N体模拟和ASTRID流体力学宇宙学模拟的平行分析使我们能够建模关联函数、估算协方差矩阵并推断晕质量。 我们发现这两种方法的结果是一致的，并且总体上符合标准的SMHM关系。 这种一致性表明，我们能够准确测量和建模LATIS中的Lyman α吸收线（Lyman alpha, Ly）$\alpha$和$\delta_F$的传输波动。 我们还表明，星系与Ly$\alpha$吸收线之间的交叉关联性——这是这些红移处光学光谱星系巡天的自由副产品——可以以与星系-星系聚类相似的精度限制暗晕质量。 显示英文摘要

摘要： The connection between galaxies and dark matter halos is often quantified using the stellar mass-halo mass (SMHM) relation. Optical and near-infrared imaging surveys have led to a broadly consistent picture of the evolving SMHM relation based on measurements of galaxy abundances and angular correlation functions. Spectroscopic surveys at $z \gtrsim 2$ can also constrain the SMHM relation via the galaxy autocorrelation function and through the cross-correlation between galaxies and Ly$\alpha$ absorption measured in transverse sightlines; however, such studies are very few and have produced some unexpected or inconclusive results. We use $\sim$3000 spectra of $z\sim2.5$ galaxies from the Lyman-alpha Tomography IMACS Survey (LATIS) to measure the galaxy-galaxy and galaxy-Ly$\alpha$ correlation functions in four bins of stellar mass spanning $10^{9.2} \lesssim M_* / M_{\odot} \lesssim 10^{10.5}$. Parallel analyses of the MultiDark N-body and ASTRID hydrodynamic cosmological simulations allow us to model the correlation functions, estimate covariance matrices, and infer halo masses. We find that results of the two methods are mutually consistent and are broadly in accord with standard SMHM relations. This consistency demonstrates that we are able to accurately measure and model Ly$\alpha$ transmission fluctuations $\delta_F$ in LATIS. We also show that the galaxy-Ly$\alpha$ cross-correlation, a free byproduct of optical spectroscopic galaxy surveys at these redshifts, can constrain halo masses with similar precision to galaxy-galaxy clustering.