BICEP2 / Keck Array XI：BK15数据集中的束流表征与温度到偏振泄漏
天体物理仪器与方法
2021-01-07 v3 宇宙学与河外天体物理
摘要
对宇宙微波背景（CMB）偏振的精确测量要求对仪器系统误差进行极度控制。在 companion paper 中，我们给出了 BICEP2 与 Keck Array 实验截至并包含 2015 观测季（BK15）的宇宙学约束，得到了迄今最深的 CMB 偏振图以及对张量-标量比的统计灵敏度 。在本工作中，我们表征了束流，并约束了三个 BK15 频率（95、150 和 220 GHz）下主束形状失配导致的潜在系统误差污染。使用了 2010–2015 年获取的 7,360 个不同束流模式的远场图来测量差分束流参数，并预测温度到偏振泄漏对 BK15 B 模式图的贡献。在利用 BK15、Planck 和 WMAP 图分离天空成分的多频率、多成分似然分析中，我们发现将此预测泄漏加入模拟会引入偏差 。未来使用更高质量束流图以及改进技术来检测 CMB 数据中的此类泄漏，将大幅降低该不确定性，从而实现 BICEP Array 及其他计划明确探测大场暴胀的实验所需的系统误差控制水平。
引用
@article{arxiv.1904.01640,
title = {BICEP2 / Keck Array XI: Beam Characterization and Temperature-to-Polarization Leakage in the BK15 Dataset},
author = {Keck Array and BICEP2 Collaborations and : and P. A. R. Ade and Z. Ahmed and R. W. Aikin and D. Barkats and S. J. Benton and C. A. Bischoff and J. J. Bock and R. Bowens-Rubin and J. A. Brevik and I. Buder and E. Bullock and V. Buza and J. Connors and J. Cornelison and B. P. Crill and M. Crumrine and M. Dierickx and L. Duband and J. P. Filippini and S. Fliescher and J. Grayson and G. Hall and M. Halpern and S. Harrison and S. R. Hildebrandt and G. C. Hilton and H. Hui and K. D. Irwin and J. Kang and K. S. Karkare and E. Karpel and J. P. Kaufman and B. G. Keating and S. Kefeli and S. A. Kernasovskiy and J. M. Kovac and C. L. Kuo and N. A. Larsen and K. Lau and E. M. Leitch and M. Lueker and K. G. Megerian and L. Moncelsi and T. Namikawa and C. B. Netterfield and H. T. Nguyen and R. O'Brient and R. W. Ogburn and S. Palladino and C. Pryke and B. Racine and S. Richter and A. Schillaci and R. Schwarz and C. D. Sheehy and A. Soliman and T. St. Germaine and Z. K. Staniszewski and B. Steinbach and R. V. Sudiwala and G. P. Teply and K. L. Thompson and J. E. Tolan and C. Tucker and A. D. Turner and C. Umilta and A. G. Vieregg and A. Wandui and A. C. Weber and D. V. Wiebe and J. Willmert and C. L. Wong and W. L. K. Wu and H. Yang and K. W. Yoon and C. Zhang},
journal= {arXiv preprint arXiv:1904.01640},
year = {2021}
}
备注
18 pages, 9 figures, 4 tables. Minor correction to Figure 2 and caption