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arXiv 1608.02668astro-ph.CO
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2度场透镜调查:设计和聚类测量

The 2-degree Field Lensing Survey: design and clustering measurements

Chris Blake, Alexandra Amon, Michael Childress, Thomas Erben, Karl Glazebrook, Joachim Harnois-Deraps, Catherine Heymans, Hendrik Hildebrandt, Samuel R. Hinton,… 展开作者

Chris Blake, Alexandra Amon, Michael Childress, Thomas Erben, Karl Glazebrook, Joachim Harnois-Deraps, Catherine Heymans, Hendrik Hildebrandt, Samuel R. Hinton, Steven Janssens, Andrew Johnson, Shahab Joudaki, Dominik Klaes, Konrad Kuijken, Chris Lidman, Felipe A. Marin, David Parkinson, Gregory B. Poole, Christian Wolf

摘要:

我们提出了2度场透镜巡天(2dFLenS),一个新的星系红移调查进行的英澳望远镜。2dFLenS是第一个专门针对深度成像引力透镜场绘制的区域的广域光谱调查,在这种情况下是千度调查。2dFLenS在731平方度的区域内获得了z <0.9范围内的70,079个红移,旨在扩展可用于测试引力物理的数据集,并促进联合成像和光谱分析的相关算法的发展。红移样本首先由40,531个发光红星系(LRGs)组成,它们可以分析星系-星系透镜效应,红移-空间失真和交叉相关的重叠源红移分布。另外的28,269个红移形成了一个星等受限(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,我们描述的动机,目标选择,光谱观测和聚类分析的2dFLenS。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内的红移空间失真参数,分别为beta = 0.49 +/-0.15和beta = 0.26 +/-0.09。这些值与重子振荡谱学巡天中从LRG得到的值是一致的。2dFLenS数据产品将通过我们的网站www.example.com发布。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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