KiDS-450: tomographic cross-correlation of galaxy shear with Planck lensing
KiDS-450: tomographic cross-correlation of galaxy shear with Planck lensing
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DOI：
10.1093/mnras/stx1675
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发表时间：
2017-03
影响因子：
4.8
通讯作者：
J. Harnois-D'eraps;T. Troster;N. E. Chisari;C. Heymans;L. Waerbeke;M. Asgari;Maciej Bilicki;A. Choi;H. Hildebrandt;H. Hoekstra;S. Joudaki;K. Kuijken;J. Merten;L. Miller;N. Robertson;P. Schneider;M. Viola
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文献类型：
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作者：
J. Harnois-D'eraps;T. Troster;N. E. Chisari;C. Heymans;L. Waerbeke;M. Asgari;Maciej Bilicki;A. Choi;H. Hildebrandt;H. Hoekstra;S. Joudaki;K. Kuijken;J. Merten;L. Miller;N. Robertson;P. Schneider;M. Viola
我们提出了在Kilo Degree Survey（KiDS-450）中测量的星系透镜与普朗克2015年探测到的宇宙微波背景（CMB）的重叠透镜测量之间的层析交叉相关性。我们将我们的联合探测测量与平坦$\Lambda$CDM宇宙学的理论预期进行比较，假设KiDS-450宇宙剪切和普朗克CMB分析的最佳拟合宇宙学参数。我们发现我们的结果与KiDS-450宇宙学在1 σ以内是一致的，振幅重标度参数A_{\rmKiDS} = 0.86 \pm 0.19$.采用普朗克宇宙学，我们发现我们的结果在2 σ以内是一致的，A_{\it Planck} = 0.68 \pm 0.15$.我们表明，在这两种情况下，当污染的信号由固有的星系排列占，增加$A$的$\sim 0.1$的协议得到改善。这是第一次层析分析的星系透镜- CMB透镜互相关信号，是基于五个光度红移箱。我们使用这种测量作为一个独立的验证的乘法剪切校准和校准源的红移分布在高红移。我们发现，这两个量的约束是强相关的，从这种技术，因此不应被视为一个独立的竞争力校准工具。
We present the tomographic cross-correlation between galaxy lensing measured in the Kilo Degree Survey (KiDS-450) with overlapping lensing measurements of the cosmic microwave background (CMB), as detected by Planck 2015. We compare our joint probe measurement to the theoretical expectation for a flat $\Lambda$CDM cosmology, assuming the best-fitting cosmological parameters from the KiDS-450 cosmic shear and Planck CMB analyses. We find that our results are consistent within $1\sigma$ with the KiDS-450 cosmology, with an amplitude re-scaling parameter $A_{\rm KiDS} = 0.86 \pm 0.19$. Adopting a Planck cosmology, we find our results are consistent within $2\sigma$, with $A_{\it Planck} = 0.68 \pm 0.15$. We show that the agreement is improved in both cases when the contamination to the signal by intrinsic galaxy alignments is accounted for, increasing $A$ by $\sim 0.1$. This is the first tomographic analysis of the galaxy lensing -- CMB lensing cross-correlation signal, and is based on five photometric redshift bins. We use this measurement as an independent validation of the multiplicative shear calibration and of the calibrated source redshift distribution at high redshifts. We find that constraints on these two quantities are strongly correlated when obtained from this technique, which should therefore not be considered as a stand-alone competitive calibration tool.