MWA EoR 功率谱首个观测季在红移 7 处的结果
天体物理仪器与方法
2016-12-13 v1 宇宙学与河外天体物理
摘要
Murchison Widefield Array (MWA) 已收集了数百小时的再电离时期 (Epoch of Reionization, EoR) 数据，目前面临的挑战是如何克服前景辐射和系统污染，将数据简化为宇宙学测量结果。我们引入了几种新颖的分析技术，如电缆反射校准、超分辨率网格化核、弥散前景模型减法以及质量控制方法。针对每一项对分析流程的改进，我们都通过二维功率谱的品质因数进行了测试，以证明其有效性。我们将这些新技术应用于 32 小时 MWA 数据的深度积分分析。利用该数据集，我们在 h~Mpc 和 处对宇宙学功率谱给出了受系统误差限制的上限 mK，该结果与其他已发表的限值一致，且较之前的 MWA 结果有适度改善（因子为 1.4）。通过这次深度分析，我们确定了一系列需要改进的 EoR 数据分析策略。这些改进将在未来实施，并在即将发表的论文中详细阐述。
引用
@article{arxiv.1608.06281,
title = {First Season MWA EoR Power Spectrum Results at Redshift 7},
author = {A. P. Beardsley and B. J. Hazelton and I. S. Sullivan and P. Carroll and N. Barry and M. Rahimi and B. Pindor and C. M. Trott and J. Line and Daniel C. Jacobs and M. F. Morales and J. C. Pober and G. Bernardi and Judd D. Bowman and M. P. Busch and F. Briggs and R. J. Cappallo and B. E. Corey and A. de Oliveira-Costa and Joshua S. Dillon and D. Emrich and A. Ewall-Wice and L. Feng and B. M. Gaensler and R. Goeke and L. J. Greenhill and J. N. Hewitt and N. Hurley-Walker and M. Johnston-Hollitt and D. L. Kaplan and J. C. Kasper and H. S. Kim and E. Kratzenberg and E. Lenc and A. Loeb and C. J. Lonsdale and M. J. Lynch and B. McKinley and S. R. McWhirter and D. A. Mitchell and E. Morgan and A. R. Neben and Nithyanandan Thyagarajan and D. Oberoi and A. R. Offringa and S. M. Ord and S. Paul and T. Prabu and P. Procopio and J. Riding and A. E. E. Rogers and A. Roshi and N. Udaya Shankar and Shiv K. Sethi and K. S. Srivani and R. Subrahmanyan and M. Tegmark and S. J. Tingay and M. Waterson and R. B. Wayth and R. L. Webster and A. R. Whitney and A. Williams and C. L. Williams and C. Wu and J. S. B. Wyithe},
journal= {arXiv preprint arXiv:1608.06281},
year = {2016}
}
备注
21 pages, 16 figures, accepted to ApJ