Direct Optimal Mapping Image Power Spectrum and its Window Functions
Abstract
The key to detecting neutral hydrogen during the epoch of reionization (EoR) is to separate the cosmological signal from the dominating foreground radiation. We developed direct optimal mapping (DOM) to map interferometric visibilities; it contains only linear operations, with full knowledge of point spread functions from visibilities to images. Here, we demonstrate a fast Fourier transform-based image power spectrum and its window functions computed from the DOM images. We use noiseless simulation, based on the Hydrogen Epoch of Reionization Array Phase I configuration, to study the image power spectrum properties. The window functions show of the integrated power leaks from the foreground-dominated region into the EoR window; the 2D and 1D power spectra also verify the separation between the foregrounds and the EoR.
Cite
@article{arxiv.2311.10711,
title = {Direct Optimal Mapping Image Power Spectrum and its Window Functions},
author = {Zhilei Xu and Honggeun Kim and Jacqueline N. Hewitt and Kai-Feng Chen and Nicholas S. Kern and Eleanor Rath and Ruby Byrne and Adélie Gorce and Robert Pascua and Zachary E. Martinot and Joshua S. Dillon and Bryna J. Hazelton and Adrian Liu and Miguel F. Morales 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 Eloy de Lera Acedo and Matt Dexter 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 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 Anita Loots and David Harold Edward MacMahon and Lourence Malan and Cresshim Malgas and Keith Malgas and Bradley Marero 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 Nima Razavi-Ghods and James Robnett and Kathryn Rosie and Peter Sims and Craig Smith and Hilton Swarts and Nithyanandan Thyagarajan and Pieter van Wyngaarden and Peter K. G. Williams and Haoxuan Zheng},
journal= {arXiv preprint arXiv:2311.10711},
year = {2024}
}
Comments
Published in ApJ