氢再电离纪元阵列的冗余基线校准
天体物理仪器与方法
2020-11-05 v2 宇宙学与河外天体物理
摘要
在 21 cm 宇宙学中，精密校准是将中性氢信号与非常明亮但频谱平滑的天体物理前景分离的关键。氢再电离纪元阵列（HERA）是一台专用于 21 cm 宇宙学、目前正在南非建设的干涉仪，其设计在很大程度上利用对同一干涉模式的重复测量的自洽性进行校准。这一被称为“冗余基线校准”的技术解决了校准问题中的大多数内部自由度。然而，它假设天线单元具有相同的主波束并精确放置在冗余网格上。在这项工作中，我们回顾了实现冗余基线校准算法的详细过程，并报告了使用 HERA 数据的结果。我们量化了现实世界中非冗余性的影响，以及它们与理想化场景（其中冗余测量仅在其噪声实现上不同）的比较。最后，我们研究了非冗余性如何在我们校准解中产生虚假的时间结构——在数据和模拟中皆然——并提出了缓解该结构的策略。
引用
@article{arxiv.2003.08399,
title = {Redundant-Baseline Calibration of the Hydrogen Epoch of Reionization Array},
author = {Joshua S. Dillon and Max Lee and Zaki S. Ali and Aaron R. Parsons and Naomi Orosz and Chuneeta Devi Nunhokee and Paul La Plante and Adam P. Beardsley and Nicholas S. Kern and Zara Abdurashidova and James E. Aguirre and Paul Alexander and Yanga Balfour and Gianni Bernardi and Tashalee S. Billings and Judd D. Bowman and Richard F. Bradley and Phil Bull and Jacob Burba and Steve Carey and Chris L. Carilli and Carina Cheng and David R. DeBoer and Matt Dexter and Eloy de Lera Acedo and John Ely and Aaron Ewall-Wice and Nicolas Fagnoni and Randall Fritz and Steven R. Furlanetto and Kingsley Gale-Sides and Brian Glendenning and Deepthi Gorthi and Bradley Greig and Jasper Grobbelaar and Ziyaad Halday and Bryna J. Hazelton and Jacqueline N. Hewitt and Jack Hickish and Daniel C. Jacobs and Austin Julius and Joshua Kerrigan and Piyanat Kittiwisit and Saul A. Kohn and Matthew Kolopanis and Adam Lanman and Telalo Lekalake and David Lewis and Adrian Liu and Yin-Zhe Ma and David MacMahon and Lourence Malan and Cresshim Malgas and Matthys Maree and Zachary E. Martinot and Eunice Matsetela and Andrei Mesinger and Mathakane Molewa and Miguel F. Morales and Tshegofalang Mosiane and Steven Murray and Abraham R. Neben and Bojan Nikolic and Robert Pascua and Nipanjana Patra and Samantha Pieterse and Jonathan C. Pober and Nima Razavi-Ghods and Jon Ringuette and James Robnett and Kathryn Rosie and Mario G. Santos and Peter Sims and Craig Smith and Angelo Syce and Max Tegmark and Nithyanandan Thyagarajan and Peter K. G. Williams and Haoxuan Zheng},
journal= {arXiv preprint arXiv:2003.08399},
year = {2020}
}
备注
24 Pages, 19 Figures. Updated to match the accepted MNRAS version