CHIPS：宇宙学中性氢功率谱估计器
天体物理仪器与方法
2016-03-09 v1 宇宙学与河外天体物理
摘要
许多当前低频射电望远镜的主要科学目标是探测再电离时期（Epoch of Reionization, EoR）的宇宙学中性氢信号，并估计其基本物理参数。本文描述了宇宙学中性氢功率谱估计器（CHIPS），这是一种利用默奇森宽场阵列（Murchison Widefield Array, MWA）数据开发并实现的算法，用于计算亮度温度涨落的二维和球平均功率谱。CHIPS的主要动机是应用真实的仪器和前景模型来形成最优估计器，从而最大化无偏信号估计的可能性，并允许对输出有完整的协变理解。CHIPS通过最大似然估计器对数据采用逆协方差加权，从而允许使用全参数空间进行信号估计（“前景抑制”）。我们描述了该算法的动机、实现、对真实和模拟数据的应用以及早期输出。将算法应用于一组3小时的数据后，我们在红移范围内，针对~h.Mpc处的EoR无量纲功率设定了2上限~mK，与先前的估计一致。
引用
@article{arxiv.1601.02073,
title = {CHIPS: The Cosmological HI Power Spectrum Estimator},
author = {Cathryn M. Trott and Bart Pindor and Pietro Procopio and Randall B. Wayth and Daniel A. Mitchell and Benjamin McKinley and Steven J. Tingay and N. Barry and A. P. Beardsley and G. Bernardi and Judd D. Bowman and F. Briggs and R. J. Cappallo and P. Carroll and A. de Oliveira-Costa and Joshua S. Dillon and A. Ewall-Wice and L. Feng and L. J. Greenhill and B. J. Hazelton and J. N. Hewitt and N. Hurley-Walker and M. Johnston-Hollitt and Daniel C. Jacobs and D. L. Kaplan and HS Kim and E. Lenc and J. Line and A. Loeb and C. J. Lonsdale and M. F. Morales 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 J. C. Pober and T. Prabu and J. Riding and N. Udaya Shankar and Shiv K. Sethi and K. S. Srivani and R. Subrahmanyan and I. S. Sullivan and M. Tegmark and R. L. Webster and A. Williams and C. L. Williams and C. Wu and J. S. B. Wyithe},
journal= {arXiv preprint arXiv:1601.02073},
year = {2016}
}
备注
34 pages, accepted for publication in ApJ