21cm 宇宙学的直接最优映射：以氢再电离时代阵列为例的演示
宇宙学与河外天体物理
2022-10-28 v2 天体物理仪器与方法
摘要
出于对具有明确统计性质的大视场图像用于 21cm 宇宙学的需求，我们实现了一个最优映射流水线，利用干涉测量方程计算天空的最大似然估计量。我们用氢再电离时代 (HERA) 第一阶段观测数据演示了这一直接最优映射。在用模拟数据验证流水线后，我们开发了一个最大似然优度指标，用于在 166MHz、100kHz 带宽下比较四个天空模型。HERA 数据与 GLEAM 星表一致到 <10%。在减去 GLEAM 点源后，HERA 数据区分了不同的连续谱天空模型，为 Byrne 等人 2021 的模型提供了最多支持。我们报告了映射 HERA 第一阶段数据的计算成本，并预估了 HERA 320 天线数据的计算量；两者在现代服务器上均可行。该算法广泛适用于其他干涉仪，并对大视场和非共面阵列有效。
引用
@article{arxiv.2204.06021,
title = {Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array},
author = {Zhilei Xu and Jacqueline N. Hewitt and Kai-Feng Chen and Honggeun Kim and Joshua S. Dillon and Nicholas S. Kern and Miguel F. Morales and Bryna J. Hazelton and Ruby Byrne and Nicolas Fagnoni and Eloy de Lera Acedo 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 Gianni Bernardi and Tashalee S. Billings and Judd D. Bowman and Richard F. Bradley and Philip Bull and Jacob Burba and Steven Carey and Chris L. Carilli and Carina Cheng and David R. DeBoer and Matt Dexter and Nico Eksteen and John Ely and Aaron Ewall-Wice 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 Jack Hickish and Daniel C. Jacobs and Austin Julius and MacCalvin Kariseb and Joshua Kerrigan and Piyanat Kittiwisit 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 Harold Edward MacMahon and Lourence Malan and Cresshim Malgas and Keith Malgas and Bradley Marero and Zachary E. Martinot and Andrei Mesinger and Mathakane Molewa and Tshegofalang Mosiane and Steven G. Murray and Abraham R. Neben and Bojan Nikolic and Hans Nuwegeld and Aaron R. Parsons and Nipanjana Patra and Samantha Pieterse and Jonathan C. Pober and Nima Razavi-Ghods and James Robnett and Kathryn Rosie and Peter Sims and Craig Smith and Hilton Swarts and Nithyanandan Thyagarajan and Pieter Van Van Wyngaarden and Peter K. G. Williams and Haoxuan Zheng},
journal= {arXiv preprint arXiv:2204.06021},
year = {2022}
}
备注
16 pages, 10 figures, 2 tables, published on ApJ