巡天几何与近期宇宙剪切测量的内部一致性
宇宙学与河外天体物理
2018-08-08 v2
摘要
我们探讨了在宇宙剪切实验解析协方差矩阵中对形状噪声项典型近似的更新所产生的影响，该近似假设不存在巡天边界和掩膜效应。我们基于巡天掩膜给出了该项中星系对数量的精确表达式，这导致 Kilo-Degree Survey（KIDS-450）实空间宇宙剪切数据在最大测量尺度上的形状噪声增加超过三倍。我们将该解析表达式的结果与几种从数据中测量形状噪声的替代方法进行比较，发现高度一致。对协方差的此次更新解决了先前 KIDS-450 宇宙剪切数据巨大的宇宙学最佳拟合 所表现出的任何内部模型张力。在 118 个自由度下，最佳拟合 从 161 降至 121。我们还对乘性剪切校准不确定性纳入协方差的方式进行了修正。这一改变，连同先前已知的关于数据矢量有效角值的更新，共同将推断的相关函数振幅推向更高的值。我们发现这改善了 KIDS-450 宇宙剪切结果与 Dark Energy Survey 第一年及 Planck 结果的一致性。
引用
@article{arxiv.1804.10663,
title = {Survey geometry and the internal consistency of recent cosmic shear measurements},
author = {M. A. Troxel and E. Krause and C. Chang and T. F. Eifler and O. Friedrich and D. Gruen and N. MacCrann and A. Chen and C. Davis and J. DeRose and S. Dodelson and M. Gatti and B. Hoyle and D. Huterer and M. Jarvis and F. Lacasa and H. V. Peiris and J. Prat and S. Samuroff and C. Sánchez and E. Sheldon and P. Vielzeuf and M. Wang and J. Zuntz and F. B. Abdalla and S. Allam and J. Annis and S. Avila and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and M. Crocce and C. E. Cunha and C. B. D'Andrea and L. N. da Costa and J. De Vicente and H. T. Diehl and P. Doel and A. E. Evrard and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and E. Gaztanaga and D. W. Gerdes and R. A. Gruendl and J. Gschwend and G. Gutierrez and W. G. Hartley and D. L. Hollowood and K. Honscheid and D. J. James and D. Kirk and K. Kuehn and N. Kuropatkin and T. S. Li and M. Lima and M. March and F. Menanteau and R. Miquel and J. J. Mohr and R. L. C. Ogando and A. A. Plazas and A. Roodman and E. Sanchez and V. Scarpine and R. Schindler and I. Sevilla-Noarbe and M. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and D. Thomas and A. R. Walker and R. H. Wechsler},
journal= {arXiv preprint arXiv:1804.10663},
year = {2018}
}
备注
7 pages, 2 figures; matches accepted version