标题： 暗能量巡天 显示英文标题

标题： The Dark Energy Survey

摘要： 我们描述了暗能量巡天（DES），这是一个提议的光学-近红外巡天计划，旨在对南银极帽5000平方度区域进行观测，深度达到SDSS griz波段的约24等。该巡天计划使用一个新的3平方度的CCD相机，安装在美国智利Cerro Tololo泛美天文台（CTIO）的Blanco 4米望远镜上。 巡天数据将使我们能够通过四种独立的方法测量暗能量和暗物质密度以及暗能量的状态方程：星系团、弱引力透镜层析成像、星系角聚类以及超新星距离。这些方法是双重互补的：它们限制了宇宙学模型参数的不同组合，并受到不同的系统误差影响。 通过用同一数据集以共同的分析框架得出这四组测量结果，我们将对系统误差进行重要的交叉验证，从而在暗能量测量的精度方面取得显著且稳健的进步。 显示英文摘要

摘要： We describe the Dark Energy Survey (DES), a proposed optical-near infrared survey of 5000 sq. deg of the South Galactic Cap to ~24th magnitude in SDSS griz, that would use a new 3 sq. deg CCD camera to be mounted on the Blanco 4-m telescope at Cerro Telolo Inter-American Observatory (CTIO). The survey data will allow us to measure the dark energy and dark matter densities and the dark energy equation of state through four independent methods: galaxy clusters, weak gravitational lensing tomography, galaxy angular clustering, and supernova distances. These methods are doubly complementary: they constrain different combinations of cosmological model parameters and are subject to different systematic errors. By deriving the four sets of measurements from the same data set with a common analysis framework, we will obtain important cross checks of the systematic errors and thereby make a substantial and robust advance in the precision of dark energy measurements.