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

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arxiv 2402.08659 v2 pith:2SZMAWWD submitted 2024-02-13 astro-ph.CO astro-ph.IM

Hugh Garsden , Philip Bull , Mike Wilensky , Zuhra Abdurashidova , Tyrone Adams , James E. Aguirre , Paul Alexander , Zaki S. Ali
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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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keywords filteringfringe-ratefiltersbeamcorrelateddatademonstrationdifferent
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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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  1. Impacts and Statistical Mitigation of Missing Data on the 21cm Power Spectrum: A Case Study with the Hydrogen Epoch of Reionization Array

    astro-ph.CO 2024-11 conditional novelty 6.0 of 10

    Partially flagged RFI gaps couple with nightly-varying instrument errors to leak foreground power into the 21cm EoR window; DPSS inpainting with a new covariance framework suppresses the leakage and quantifies its unc...

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