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arXiv · 2402.08659

A demonstration of the effect of fringe-rate filtering in the Hydrogen Epoch of Reionization Array delay power spectrum pipeline

Hugh Garsden·Philip Bull·Mike Wilensky·Zuhra Abdurashidova·Tyrone Adams·James E. Aguirre·Paul Alexander·Zaki S. Ali·Rushelle Baartman·Yanga Balfour·Adam P. Beardsley·Lindsay M. Berkhout·Gianni Bernardi·Tashalee S. Billings·Judd D. Bowman·Richard F. Bradley·Jacob Burba·Steven Carey·Chris L. Carilli·Kai-Feng Chen·Carina Cheng·Samir Choudhuri·David R. DeBoer·Eloy de Lera Acedo·Matt Dexter·Joshua S. Dillon·Scott Dynes·Nico Eksteen·John Ely·Aaron Ewall-Wice·Nicolas Fagnoni·Randall Fritz·Steven R. Furlanetto·Kingsley Gale-Sides·Bharat Kumar Gehlot·Abhik Ghosh·Brian Glendenning·Adelie Gorce·Deepthi Gorthi·Bradley Greig·Jasper Grobbelaar·Ziyaad Halday·Bryna J. Hazelton·Jacqueline N. Hewitt·Jack Hickish·Tian Huang·Daniel C. Jacobs·Alec Josaitis·Austin Julius·MacCalvin Kariseb·Nicholas S. Kern·Joshua Kerrigan·Honggeun Kim·Piyanat Kittiwisit·Saul A. Kohn·Matthew Kolopanis·Adam Lanman·Paul La Plante·Adrian Liu·Anita Loots·Yin-Zhe Ma·David H. E. MacMahon·Lourence Malan·Cresshim Malgas·Keith Malgas·Bradley Marero·Zachary E. Martinot·Andrei Mesinger·Mathakane Molewa·Miguel F. Morales·Tshegofalang Mosiane·Steven G. Murray·Abraham R. Neben·Bojan Nikolic·Chuneeta Devi Nunhokee·Hans Nuwegeld·Aaron R. Parsons·Robert Pascua·Nipanjana Patra·Samantha Pieterse·Yuxiang Qin·Eleanor Rath·Nima Razavi-Ghods·Daniel Riley·James Robnett·Kathryn Rosie·Mario G. Santos·Peter Sims·Saurabh Singh·Dara Storer·Hilton Swarts·Jianrong Tan·Nithyanandan Thyagarajan·Pieter van Wyngaarden·Peter K. G. Williams·Zhilei Xu·Haoxuan Zheng
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Abstract

Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different timescales. These can be isolated by designing appropriate Fourier filters that operate in fringe-rate (FR) space, the Fourier pair of local sidereal time (LST). Applications of FR filtering include separating effects that are correlated with the rotating sky vs. those relative to the ground, down-weighting emission in the primary beam sidelobes, and suppressing noise. FR filtering causes the noise contributions to the visibility data to become correlated in time however, making interpretation of subsequent averaging and error estimation steps more subtle. In this paper, we describe fringe rate filters that are implemented using discrete prolate spheroidal sequences, and designed for two different purposes -- beam sidelobe/horizon suppression (the `mainlobe' filter), and ground-locked systematics removal (the `notch' filter). We apply these to simulated data, and study how their properties affect visibilities and power spectra generated from the simulations. Included is an introduction to fringe-rate filtering and a demonstration of fringe-rate filters applied to simple situations to aid understanding.

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Hugh Garsden, Philip Bull, Mike Wilensky, Zuhra Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Adam P. Beardsley, Lindsay M. Berkhout, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Jacob Burba, Steven Carey, Chris L. Carilli, Kai-Feng Chen, Carina Cheng, Samir Choudhuri, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, Scott Dynes, Nico Eksteen, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Bharat Kumar Gehlot, Abhik Ghosh, Brian Glendenning, Adelie Gorce, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Jacqueline N. Hewitt, Jack Hickish, Tian Huang, Daniel C. Jacobs, Alec Josaitis, Austin Julius, MacCalvin Kariseb, Nicholas S. Kern, Joshua Kerrigan, Honggeun Kim, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Adrian Liu, Anita Loots, Yin-Zhe Ma, David H. E. MacMahon, Lourence Malan, Cresshim Malgas, Keith Malgas, Bradley Marero, Zachary E. Martinot, Andrei Mesinger, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Steven G. Murray, Abraham R. Neben, Bojan Nikolic, Chuneeta Devi Nunhokee, Hans Nuwegeld, Aaron R. Parsons, Robert Pascua, Nipanjana Patra, Samantha Pieterse, Yuxiang Qin, Eleanor Rath, Nima Razavi-Ghods, Daniel Riley, James Robnett, Kathryn Rosie, Mario G. Santos, Peter Sims, Saurabh Singh, Dara Storer, Hilton Swarts, Jianrong Tan, Nithyanandan Thyagarajan, Pieter van Wyngaarden, Peter K. G. Williams, Zhilei Xu, Haoxuan Zheng. 2024-02-13. A demonstration of the effect of fringe-rate filtering in the Hydrogen Epoch of Reionization Array delay power spectrum pipeline. https://arxiv.org/abs/2402.08659

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