matvis：面向多单元 21 cm 阵列快速正向建模的矩阵化可见度模拟器
天体物理仪器与方法
2025-01-09 v2
摘要
探测来自宇宙黎明和再电离时期的微弱 21 cm 线辐射，不仅需要对仪器校准和系统误差进行精细控制以实现观测所需的动态范围，还需要验证分析技术以证明其统计特性和信号损失特性。实现这一目标的关键在于，能够对专为这些研究建造的大型、多单元射电干涉阵列所产生的数据类型进行高保真模拟。这些阵列的大规模带来了计算挑战，因为对于拥有数百个天线的阵列，必须模拟跨越数百个频率通道、数千个时间样本和数万条基线的详细天空和仪器模型。在本文中，我们提出了一种快速的矩阵化方法，用于在所需规模上模拟射电干涉测量（可见度）。我们通过合理利用主波束插值、坐标变换的快速近似，以及向量化外积将每天线量扩展为每基线可见度，并结合标准并行化技术来实现这一目标。我们在公开可用的 matvis 代码中实现了该方法，并将其结果与高精度参考模拟器进行了验证，同时探讨了其在各种问题上的计算扩展性。
引用
@article{arxiv.2312.09763,
title = {matvis: A matrix-based visibility simulator for fast forward modelling of many-element 21 cm arrays},
author = {Piyanat Kittiwisit and Steven G. Murray and Hugh Garsden and Philip Bull and Christopher Cain and Aaron R. Parsons and Jackson Sipple and Zara Abdurashidova and Tyrone Adams and James E. Aguirre and Paul Alexander and Zaki S. Ali and Rushelle Baartman and Yanga Balfour and Adam P. Beardsley and Lindsay M. Berkhout and Gianni Bernardi and Tashalee S. Billings and Judd D. Bowman and Richard F. Bradley and Jacob Burba and Steven Carey and Chris L. Carilli and Kai-Feng Chen and Carina Cheng and Samir Choudhuri and David R. DeBoer and Eloy de Lera Acedo and Matt Dexter and Joshua S. Dillon and Scott Dynes and Nico Eksteen and John Ely and Aaron Ewall-Wice and Nicolas Fagnoni and Randall Fritz and Steven R. Furlanetto and Kingsley Gale-Sides and Bharat Kumar Gehlot and Abhik Ghosh and Brian Glendenning and Adelie Gorce and Deepthi Gorthi and Bradley Greig and Jasper Grobbelaar and Ziyaad Halday and Bryna J. Hazelton and Jacqueline N. Hewitt and Jack Hickish and Tian Huang and Daniel C. Jacobs and Alec Josaitis and Austin Julius and MacCalvin Kariseb and Nicholas S. Kern and Joshua Kerrigan and Honggeun Kim and Saul A. Kohn and Matthew Kolopanis and Adam Lanman and Paul La Plante and Adrian Liu and Anita Loots and Yin-Zhe Ma and David H. E. MacMahon and Lourence Malan and Cresshim Malgas and Keith Malgas and Bradley Marero and Zachary E. Martinot and Andrei Mesinger and Mathakane Molewa and Miguel F. Morales and Tshegofalang Mosiane and Abraham R. Neben and Bojan Nikolic and Chuneeta Devi Nunhokee and Hans Nuwegeld and Robert Pascua and Nipanjana Patra and Samantha Pieterse and Yuxiang Qin and Eleanor Rath and Nima Razavi-Ghods and Daniel Riley and James Robnett and Kathryn Rosie and Mario G. Santos and Peter Sims and Saurabh Singh and Dara Storer and Hilton Swarts and Jianrong Tan and Nithyanandan Thyagarajan and Pieter van Wyngaarden and Peter K. G. Williams and Zhilei Xu and Haoxuan Zheng},
journal= {arXiv preprint arXiv:2312.09763},
year = {2025}
}
备注
24 pages, 10 figures, accepted to RAS Techniques and Instruments, matvis is publicly available at https://github.com/HERA-Team/matvis