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arXiv 1502.03405astro-ph.CO
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CFHTLenS星系数密度与Planck CMB透镜的互相关

Cross-Correlation of CFHTLenS Galaxy Number Density and Planck CMB Lensing

Y. Omori, G. Holder

摘要:

我们测量了来自加拿大-法国-夏威夷望远镜透镜巡天(CFHTLenS)目录的星系密度与来自普朗克数据发布1(2013)和2(2015)的引力透镜收敛之间的交叉功率谱。我们调查了三个主要的星系样本:$18.0<i_{\rm AB}<22.0$,$18.0<i_{\rm AB}<23.0$,$18.0<i_{\rm AB}<24.0$在红移范围$0.2<z<1.3$在四个CFHTLens宽领域。通过比较测量的互谱与模型预测,使用普朗克2015年发布的$3.5, 4.5, 5.6σ$的显著性推断出$b=0.82^{+0.24}_{-0.23}, 0.83^{+0.19}_{-0.18}, 0.82^{+0.16}_{-0.14}$的线性星系-暗物质偏差。这些测量结果与来自星系-星系自相关的偏差(分别为$b=1.15^{+0.02}_{-0.01}, 1.08^{+0.01}_{-0.01}$和$0.96^{+0.01}_{-0.01}$)略有一致。使用2013年普朗克发布的数据,我们获得了$b=1.33^{+0.29}_{-0.28}, 1.19^{+0.23}_{-0.23}, 1.16^{+0.19}_{-0.18}$的偏差,显示了发布之间的显著差异。

英文摘要:

We measure the cross-power spectrum between galaxy density from Canada-France-Hawaii-Telescope Lensing Survey (CFHTLenS) catalogues and gravitational lensing convergence from Planck data release 1 (2013) and 2 (2015). We investigate three main galaxy samples: $18.0<i_{\rm AB}<22.0$, $18.0<i_{\rm AB}<23.0$, $18.0<i_{\rm AB}<24.0$ in the redshift range $0.2<z<1.3$ in each of the four CFHTLenS wide fields. By comparing the measured cross-spectrum with model predictions, linear galaxy-dark matter biases of $b=0.82^{+0.24}_{-0.23}, 0.83^{+0.19}_{-0.18}, 0.82^{+0.16}_{-0.14}$ are inferred at significances of $3.5, 4.5, 5.6σ$ using the Planck 2015 release. These measurements are marginally consistent with biases derived from galaxy-galaxy auto-correlations: $b=1.15^{+0.02}_{-0.01}, 1.08^{+0.01}_{-0.01}$ and $0.96^{+0.01}_{-0.01}$ respectively. Using the 2013 Planck release, we obtain biases of $b=1.33^{+0.29}_{-0.28}, 1.19^{+0.23}_{-0.23}, 1.16^{+0.19}_{-0.18}$, showing significant differences between the releases.

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