通过KBSS中产生和逃逸的经验标记预测半乳糖醛酸的赖氨酸$α$释放
Predicting Ly$α$ Emission from Galaxies via Empirical Markers of Production and Escape in the KBSS
摘要：
Ly $α$辐射被广泛用于探测和确认高红移星系以及描述星系际介质的演化。然而，在典型的光谱观测中，许多星系不显示Ly $α$发射，而内在的Ly $α$发射体代表了一组潜在的偏置高红移星系。在这项工作中，我们分析了一组703个星系在$2\lesssim z\lesssim3$与Ly $α$光谱和其他静止帧的紫外和光学性质的测量，以发展一个经验模型的Ly $α$发射星系和了解如何的概率Ly $α$发射取决于其他观测。我们考虑了几个经验代理的效率Ly $α$光子生产以及随后的逃逸这些光子通过其本地星际介质。我们发现，金属线吸收的等效宽度和静止框架光学星云线的O3比是有利的经验代理的Ly $α$逃逸和生产，分别。我们开发了一个新的数量，$X_\mathrm{LIS}^\mathrm{O3}$，结合这两个属性到一个单一的预测净Ly $α$排放，我们发现描述$\sim$ 90%的观测方差Ly $α$等效宽度时，占我们的观测不确定性。我们还构建了条件概率分布，表明星系选择的基础上测量的星系属性产生的样本的净Ly $α$发射的概率变化很大的星系。这里描述的经验模型和概率分布的应用可以用来推断当前星系巡天的选择偏差，并评估高红移Ly $α$（非）探测在再电离和星系际介质研究中的意义。
英文摘要：
Ly$α$ emission is widely used to detect and confirm high-redshift galaxies and characterize the evolution of the intergalactic medium. However, many galaxies do not display Ly$α$ emission in typical spectroscopic observations, and intrinsic Ly$α$-emitters represent a potentially biased set of high-redshift galaxies. In this work, we analyze a set of 703 galaxies at $2\lesssim z\lesssim3$ with both Ly$α$ spectroscopy and measurements of other rest-frame ultraviolet and optical properties in order to develop an empirical model for Ly$α$ emission from galaxies and understand how the probability of Ly$α$ emission depends on other observables. We consider several empirical proxies for the efficiency of Ly$α$ photon production as well as the subsequent escape of these photons through their local interstellar medium. We find that the equivalent width of metal-line absorption and the O3 ratio of rest-frame optical nebular lines are advantageous empirical proxies for Ly$α$ escape and production, respectively. We develop a new quantity, $X_\mathrm{LIS}^\mathrm{O3}$, that combines these two properties into a single predictor of net Ly$α$ emission, which we find describes $\sim$90% of the observed variance in Ly$α$ equivalent width when accounting for our observational uncertainties. We also construct conditional probability distributions demonstrating that galaxy selection based on measurements of galaxy properties yield samples of galaxies with widely varying probabilities of net Ly$α$ emission. The application of the empirical models and probability distributions described here may be used to infer the selection biases of current galaxy surveys and evaluate the significance of high-redshift Ly$α$ (non-)detections in studies of reionization and the intergalactic medium.
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