Title: The 2-degree Field Lensing Survey: design and clustering measurements Show Chinese title

Title: 2度场引力透镜调查：设计和聚类测量

Abstract: We present the 2-degree Field Lensing Survey (2dFLenS), a new galaxy redshift survey performed at the Anglo-Australian Telescope. 2dFLenS is the first wide-area spectroscopic survey specifically targeting the area mapped by deep-imaging gravitational lensing fields, in this case the Kilo-Degree Survey. 2dFLenS obtained 70,079 redshifts in the range z < 0.9 over an area of 731 sq deg, and is designed to extend the datasets available for testing gravitational physics and promote the development of relevant algorithms for joint imaging and spectroscopic analysis. The redshift sample consists first of 40,531 Luminous Red Galaxies (LRGs), which enable analyses of galaxy-galaxy lensing, redshift-space distortion, and the overlapping source redshift distribution by cross-correlation. An additional 28,269 redshifts form a magnitude-limited (r < 19.5) nearly-complete sub-sample, allowing direct source classification and photometric-redshift calibration. In this paper, we describe the motivation, target selection, spectroscopic observations, and clustering analysis of 2dFLenS. We use power spectrum multipole measurements to fit the redshift-space distortion parameter of the LRG sample in two redshift ranges 0.15 < z < 0.43 and 0.43 < z < 0.7 as beta = 0.49 +/- 0.15 and beta = 0.26 +/- 0.09, respectively. These values are consistent with those obtained from LRGs in the Baryon Oscillation Spectroscopic Survey. 2dFLenS data products will be released via our website http://2dflens.swin.edu.au. Show Chinese abstract

Abstract: 我们介绍了2度场引力透镜巡天（2dFLenS），这是一个在英澳望远镜上进行的新星系红移巡天。 2dFLenS是第一个专门针对由深度成像引力透镜场绘制的区域的广域光谱巡天，本例中是千度巡天。 2dFLenS在731平方度的区域内获得了70,079个红移，红移范围z < 0.9，并旨在扩展用于测试引力物理的数据集，并促进联合成像和光谱分析相关算法的发展。 红移样本首先包括40,531个明亮红星系（LRGs），它们可用于星系-星系引力透镜、红移空间畸变以及通过交叉相关分析重叠源红移分布。 另外的28,269个红移构成了一个绝对星等限制（r < 19.5）的几乎完整的子样本，允许直接源分类和光度红移校准。 在本文中，我们描述了2dFLenS的动机、目标选择、光谱观测和聚类分析。 我们使用功率谱多极测量来拟合LRG样本在两个红移范围0.15 < z < 0.43和0.43 < z < 0.7中的红移空间畸变参数，分别为beta = 0.49 +/- 0.15和beta = 0.26 +/- 0.09。 这些值与来自巴里奥振荡光谱巡天的LRGs所得结果一致。 2dFLenS数据产品将通过我们的网站http://2dflens.swin.edu.au发布。