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arXiv 1906.09262astro-ph.CO
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KiDS + VIKING-450和DES-Y1组合:宇宙学与宇宙剪切

KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

S. Joudaki, H. Hildebrandt, D. Traykova, N. E. Chisari, C. Heymans, A. Kannawadi, K. Kuijken, A. H. Wright, M. Asgari, T. Erben, H. Hoekstra, B. Joachimi, L. Mi… 展开作者

S. Joudaki, H. Hildebrandt, D. Traykova, N. E. Chisari, C. Heymans, A. Kannawadi, K. Kuijken, A. H. Wright, M. Asgari, T. Erben, H. Hoekstra, B. Joachimi, L. Miller, T. Tröster, J. L. van den Busch

摘要:

我们提出了一个组合的层析弱引力透镜分析的千度调查(KV 450)和暗能量调查(DES-Y1)。我们通过采用一致的先验和非线性尺度建模对这两个公共宇宙切变数据集进行了均匀化分析,并根据深层公共光谱调查确定了DES-Y1的新红移分布。采用这些修正的红移导致DES推断的$S_8$值的$0.8σ$减少,当包括基于MICE 2模拟的模拟DES数据的系统红移校准误差模型时,其减少到$0.5σ$减少。对$S_8 = 0.762^{+0.025}_{-0.024}$的KV 450 + DES-Y1组合约束与来自宇宙微波背景的普朗克2018约束在$2.5σ$水平上处于紧张状态。这一结果突出了发展方法的重要性,为当前和未来的弱透镜测量提供准确的红移校准。

英文摘要:

We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a $0.8σ$ reduction in the DES-inferred value for $S_8$, which decreases to a $0.5σ$ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450 + DES-Y1 constraint on $S_8 = 0.762^{+0.025}_{-0.024}$ is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of $2.5σ$. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak lensing surveys.

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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