A Simplified, Lossless Reanalysis of PAPER-64
A Simplified, Lossless Reanalysis of PAPER-64
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DOI：
10.3847/1538-4357/ab3e3a
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发表时间：
2019-09
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通讯作者：
M. Kolopanis;D. Jacobs;Carina Cheng;A. Parsons;S. Kohn;J. Pober;J. Aguirre;Z. Ali;G. Bernardi;R. Bradley;C. Carilli;D. DeBoer;M. Dexter;J. Dillon;Joshua Kerrigan;P. Klima;Adrian Liu;D. MacMahon;David F. Moore;N. Thyagarajan;C. Nunhokee;W. Walbrugh;A. Walker
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作者：
M. Kolopanis;D. Jacobs;Carina Cheng;A. Parsons;S. Kohn;J. Pober;J. Aguirre;Z. Ali;G. Bernardi;R. Bradley;C. Carilli;D. DeBoer;M. Dexter;J. Dillon;Joshua Kerrigan;P. Klima;Adrian Liu;D. MacMahon;David F. Moore;N. Thyagarajan;C. Nunhokee;W. Walbrugh;A. Walker
我们目前的限制，21厘米的功率谱从时代的再电离使用的数据从64天线配置的唐纳德C。贝克精密阵列探测再电离时代（PAPER）分析通过功率谱管道独立于以前的PAPER分析。先前报告的PAPER结果已被发现包含显着的信号丢失。来自先前PAPER管道的几个有损步骤未包括在此分析中，即基于延迟的前景滤波、最优条纹率滤波和基于经验协方差的估计器。与以前的分析相同的步骤包括冗余校准和本地恒星时（LST）合并。这里报告的功率谱实际上是将线性傅里叶变换分析应用于校准的LST分组数据的结果。这项分析也使用了比以前出版物更多的数据，包括完整的红移范围z = 7.5到11。在以前的论文分析中，许多功率谱测量被发现是非宇宙学功率的检测，其显著性水平从理论噪声的两倍到数百倍不等。在这里，过剩的权力，检查使用基线和功率谱折刀之间的冗余。在21 cm再电离功率谱上，我们发现在红移z = 10.87、9.93、8.68、8.37、8.13和7.48处的上限分别为、和。由于Cheng等人所述的原因，这些限制取代了所有以前的PAPER结果。
We present limits on the 21 cm power spectrum from the Epoch of Reionization using data from the 64 antenna configuration of the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) analyzed through a power spectrum pipeline independent from previous PAPER analyses. Previously reported results from PAPER have been found to contain significant signal loss. Several lossy steps from previous PAPER pipelines have not been included in this analysis, namely delay-based foreground filtering, optimal fringe-rate filtering, and empirical covariance-based estimators. Steps that remain in common with previous analyses include redundant calibration and local sidereal time (LST) binning. The power spectra reported here are effectively the result of applying a linear Fourier transform analysis to the calibrated, LST-binned data. This analysis also uses more data than previous publications, including the complete available redshift range of z ∼ 7.5 to 11. In previous PAPER analyses, many power spectrum measurements were found to be detections of noncosmological power at levels of significance ranging from two to hundreds of times the theoretical noise. Here, excess power is examined using redundancy between baselines and power spectrum jackknives. The upper limits we find on the 21 cm power spectrum from reionization are , , , , , and at redshifts z = 10.87, 9.93, 8.68, 8.37, 8.13, and 7.48, respectively. For reasons described in Cheng et al., these limits supersede all previous PAPER results.