An enlarged cosmic shear survey with the William Herschel Telescope
An enlarged cosmic shear survey with the William Herschel Telescope
复制标题
使用威廉·赫歇尔望远镜进行的放大宇宙剪切观测
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Michael L. Brown
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文献类型：
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作者：
R. Massey;A. Réfrégier;D. Bacon;R. Ellis;Michael L. Brown
我们报告了利用位于拉帕尔马的4.2米威廉·赫歇尔望远镜进行的宇宙切变巡天的结果，观测深度为R = 25.8（z = 0.8），观测角度超过4度^[2]。剪切相关函数的测量尺度从1到15弧分，并用于约束宇宙学参数。我们通过执行一系列测试，包括将信号分解为E模式和B模式，确保我们的测量不受仪器系统影响。我们还使用为COMBO-17调查开发的剪切测量管道独立地重新分析数据。这证实了我们的研究结果，也突出了不同的实施方式的基本'凯撒-斯奎尔斯-布罗德赫斯特'剪切测量方法引入的各种影响。我们发现在8 h^（−1）Mpc尺度上物质功率谱的归一化为σ8 =（1.02 ± 0.15）（0.3/Ω_m）^（1/2），其中68%的置信限误差包括噪声、样本方差、角尺度之间的协方差、系统效应、红移不确定性和其他参数的边缘化。我们比较这些结果与其他宇宙剪切调查和最近的限制从威尔金森微波各向异性探测器实验。
We report the results of a cosmic shear survey using the 4.2-m William Herschel Telescope on La Palma, to a depth of R = 25.8 (z ≈ 0.8), over 4 deg^2. The shear correlation functions are measured on scales from 1 to 15 arcmin, and are used to constrain cosmological parameters. We ensure that our measurements are free from instrumental systematic effects by performing a series of tests, including a decomposition of the signal into E- and B-modes. We also reanalyse the data independently, using the shear measurement pipeline developed for the COMBO-17 survey. This confirms our results and also highlights various effects introduced by different implementations of the basic ‘Kaiser—Squires—Broadhurst’ shear measurement method. We find that the normalization of the matter power spectrum on 8 h^(−1) Mpc scales is σ8 = (1.02 ± 0.15)(0.3/Ω_m)^(1/2), where the 68 per cent confidence limit error includes noise, sample variance, covariance between angular scales, systematic effects, redshift uncertainty and marginalization over other parameters. We compare these results with other cosmic shear surveys and with recent constraints from the Wilkinson Microwave Anisotropy Probe experiment.