来自 SPIDER 气球载望远镜首次飞行的原初 B 模约束
宇宙学与河外天体物理
2021-03-25 v1
摘要
我们展示了 SPIDER 2015 年长期气球飞行首次线性偏振测量结果,SPIDER 是一项旨在以度角尺度绘制宇宙微波背景(CMB)偏振的实验。这些测量的结果包括在天区 4.8% 范围内于 95 和 150 GHz 观测所得的图像与角功率谱,以及针对这些数据的内部一致性检验结果。虽然来自原初密度扰动的偏振 CMB 各向异性是该天区的主导信号,但也以高显著度探测到了银河系尘埃发射;在 SPIDER 频段内发现银河系同步辐射发射可忽略不计。我们采用两种独立的前景去除技术,以探究宇宙学结果对各自所假设条件的敏感性。主要方法使用由 Planck 数据导出的尘埃模板来减去银河系尘埃信号。第二种方法在谐域中对 SPIDER 与 Planck 数据进行联合分析,假设尘埃的谱能量分布为修正黑体模型且不约束其空间形态。利用对模板振幅与 r 参数空间联合采样似然,我们通过 Feldman-Cousins 与贝叶斯构造得出原初张量-标量比 95% 上限,分别为 r<0.11 与 r<0.19。r 的不确定性约一半来自模板相减相关的噪声。SPIDER 第二次飞行在 280 GHz 的新数据将补充 Planck 偏振图,提供对偏振银河系尘埃发射的有力测量。
引用
@article{arxiv.2103.13334,
title = {A Constraint on Primordial $B$-Modes from the First Flight of the SPIDER Balloon-Borne Telescope},
author = {SPIDER Collaboration and P. A. R. Ade and M. Amiri and S. J. Benton and A. S. Bergman and R. Bihary and J. J. Bock and J. R. Bond and J. A. Bonetti and S. A. Bryan and H. C. Chiang and C. R. Contaldi and O. Doré and A. J. Duivenvoorden and H. K. Eriksen and M. Farhang and J. P. Filippini and A. A. Fraisse and K. Freese and M. Galloway and A. E. Gambrel and N. N. Gandilo and K. Ganga and R. Gualtieri and J. E. Gudmundsson and M. Halpern and J. Hartley and M. Hasselfield and G. Hilton and W. Holmes and V. V. Hristov and Z. Huang and K. D. Irwin and W. C. Jones and A. Karakci and C. L. Kuo and Z. D. Kermish and J. S. -Y. Leung and S. Li and D. S. Y. Mak and P. V. Mason and K. Megerian and L. Moncelsi and T. A. Morford and J. M. Nagy and C. B. Netterfield and M. Nolta and R. O'Brient and B. Osherson and I. L. Padilla and B. Racine and A. S. Rahlin and C. Reintsema and J. E. Ruhl and M. C. Runyan and T. M. Ruud and J. A. Shariff and E. C. Shaw and C. Shiu and J. D. Soler and X. Song and A. Trangsrud and C. Tucker and R. S. Tucker and A. D. Turner and J. F. van der List and A. C. Weber and I. K. Wehus and S. Wen and D. V. Wiebe and E. Y. Young},
journal= {arXiv preprint arXiv:2103.13334},
year = {2021}
}
备注
29 pages, 13 figures