Cosmological constraints from weak lensing peak statistics with Canada–France–Hawaii Telescope Stripe 82 Survey
Cosmological constraints from weak lensing peak statistics with Canada–France–Hawaii Telescope Stripe 82 Survey
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DOI：
10.1093/mnras/stv784
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发表时间：
2014-12
影响因子：
4.8
通讯作者：
Xiangkun Liu;Chuzhong Pan;Ran Li;H. Shan;Qiao Wang;L. Fu;Z. Fan;J. Kneib;A. Leauthaud
中科院分区：
文献类型：
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作者：
Xiangkun Liu;Chuzhong Pan;Ran Li;H. Shan;Qiao Wang;L. Fu;Z. Fan;J. Kneib;A. Leauthaud
我们推导出宇宙学参数的约束条件，使用弱透镜峰值统计测量的类似于aEuro千分之130度（2）的加拿大-法国-夏威夷望远镜条纹82调查。这一分析表明，在宇宙学研究中使用峰值统计的可行性。对于我们的测量，我们考虑了信噪比在nu = [3，6]范围内的峰。对于一个只有（Omega（m），sigma（8））作为自由参数的平坦I \textgreater冷暗物质模型，我们将以下关系式I（8）磅= sigma（8）（Omega（m）/0.27）（alpha）的参数约束为I（8）磅= 0.82 +/- 0.03和alpha = 0.43 +/- 0.02。发现的α值比在两点和三点宇宙剪切相关分析中测量的α值小得多，显示出对标准弱透镜宇宙学研究的峰值统计的重要补充。导出的（Omega（m），sigma（8））约束与WMAP 9或Planck的约束完全一致。仅从弱透镜峰丰度，我们获得tex-math id=“TM 0002”符号=“LaTeX”\textbackslashOmega _\textbackslashrm m m\=0.38\textless^\textgreater\+0.27\_\-0.24\\/tex-math和sigma（8）= 0.81 +/- 0.26的边缘化平均值。最后，我们还探讨了利用弱透镜峰统计来约束暗物质晕的质量浓度关系的潜力，同时与宇宙学参数。
We derived constraints on cosmological parameters using weak lensing peak statistics measured on the similar to aEuro parts per thousand 130 deg(2) of the Canada-France-Hawaii Telescope Stripe 82 Survey. This analysis demonstrates the feasibility of using peak statistics in cosmological studies. For our measurements, we considered peaks with signal-to-noise ratio in the range of nu = [3, 6]. For a flat I \textgreater cold dark matter model with only (Omega(m), sigma(8)) as free parameters, we constrained the parameters of the following relation I (8) pound = sigma(8)(Omega(m)/0.27)(alpha) to be I (8) pound = 0.82 +/- 0.03 and alpha = 0.43 +/- 0.02. The alpha value found is considerably smaller than the one measured in two-point and three-point cosmic shear correlation analyses, showing a significant complement of peak statistics to standard weak lensing cosmological studies. The derived constraints on (Omega(m), sigma(8)) are fully consistent with the ones from either WMAP9 or Planck. From the weak lensing peak abundances alone, we obtained marginalized mean values of tex-math id=”TM0002” notation=”LaTeX”\\\textbackslashOmega _\\\textbackslashrm m\=0.38\textless^\textgreater\+0.27\_\-0.24\\/tex-math and sigma(8) = 0.81 +/- 0.26. Finally, we also explored the potential of using weak lensing peak statistics to constrain the mass-concentration relation of dark matter haloes simultaneously with cosmological parameters.