CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
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DOI：
10.1093/mnras/stw2665
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发表时间：
2016-01
影响因子：
4.8
通讯作者：
S. Joudaki;C. Blake;C. Heymans;A. Choi;J. Harnois-Déraps;H. Hildebrandt;B. Joachimi;Andrew Johnson-Andrew-Jo
中科院分区：
文献类型：
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作者：
S. Joudaki;C. Blake;C. Heymans;A. Choi;J. Harnois-Déraps;H. Hildebrandt;B. Joachimi;Andrew Johnson-Andrew-Jo
我们研究了天体物理系统对加拿大-法国-夏威夷望远镜透镜巡天（CFHTLenS）的宇宙剪切宇宙学参数约束的影响，以及与普朗克宇宙微波背景测量的一致性。我们提出更新的CFHTLenS宇宙剪切层析成像测量扩展到度尺度，使用一套新的n体模拟校准的协方差。我们用一个新的模型拟合管道来分析这些测量结果，考虑了由本征星系排列、非线性物质功率谱中的重子效应和光度红移不确定性引起的关键系统不确定性。我们研究了系统自由度对宇宙学参数约束的影响，包括独立的和联合的。当系统不确定性被独立考虑时，本征对准幅度是数据实质上优选的唯一自由度。当综合考虑系统不确定性时，对更复杂的模型没有一致的强烈偏好。我们采用基于贝叶斯证据和信息论的两种不同的数据一致性测试，量化了CFHTLenS和普朗克数据集之间的一致性水平。我们发现两个数据一致性测试在很大程度上彼此一致，CFHTLenS和普朗克数据集之间的一致性水平对我们分析中包含的系统不确定性的确切细节很敏感，从决定性的不一致性到实质性的一致性，因为系统不确定性的处理变得更加保守。最不保守的情景是最受宇宙剪切数据青睐的情景，但它也显示出与普朗克最大程度的不一致。数据和分析代码可在https://github.com/sjoudaki/cfhtlens_revisited上公开获得。
We investigate the impact of astrophysical systematics on cosmic shear cosmological parameter constraints from the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS) and the concordance with cosmic microwave background measurements by Planck. We present updated CFHTLenS cosmic shear tomography measurements extended to degree scales using a covariance calibrated by a new suite of N-body simulations. We analyse these measurements with a new model fitting pipeline, accounting for key systematic uncertainties arising from intrinsic galaxy alignments, baryonic effects in the non-linear matter power spectrum, and photometric redshift uncertainties. We examine the impact of the systematic degrees of freedom on the cosmological parameter constraints, both independently and jointly. When the systematic uncertainties are considered independently, the intrinsic alignment amplitude is the only degree of freedom that is substantially preferred by the data. When the systematic uncertainties are considered jointly, there is no consistently strong preference in favour of the more complex models. We quantify the level of concordance between the CFHTLenS and Planck data sets by employing two distinct data concordance tests, grounded in Bayesian evidence and information theory. We find that the two data concordance tests largely agree with one another and that the level of concordance between the CFHTLenS and Planck data sets is sensitive to the exact details of the systematic uncertainties included in our analysis, ranging from decisive discordance to substantial concordance as the treatment of the systematic uncertainties becomes more conservative. The least conservative scenario is the one most favoured by the cosmic shear data, but it is also the one that shows the greatest degree of discordance with Planck. The data and analysis code are publicly available at https://github.com/sjoudaki/cfhtlens_revisited.