A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline

ABSTRACT Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different time-scales. These can be isolated by designing appropriate Fourier filters that operate in fringe-rate (FR) space, the Fourier pair of local sidereal time. Applications of FR filtering include separating effects that are correlated with the rotating sky versus 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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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-11-12
DOI
https://doi.org/10.1093/mnras/stae2541
Citations
7
Primary Topic
Pulsed Power Technology Applications
Type
article
Field-Weighted Citation Impact
2.30

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article

A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline

Bradley Marero, Eloy de Lera Acedo, Hans Nuwegeld, Honggeun Kim et al.
7 citations
Monthly Notices of the Royal Astronomical Society
Pulsed Power Technology Applications
2.30
article

A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline

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

Abstract

ABSTRACT Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different time-scales. These can be isolated by designing appropriate Fourier filters that operate in fringe-rate (FR) space, the Fourier pair of local sidereal time. Applications of FR filtering include separating effects that are correlated with the rotating sky versus 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.

Monthly Notices of the Royal Astronomical SocietyVol. 535(4)
Raman Research Institute (IN), American Astronomical Society (US), Commonwealth Scientific and Industrial Research Organisation (AU), Space Science Institute (US), Scuola Normale Superiore (IT), University of California, Los Angeles (US), The University of Melbourne (AU), Queen Mary University of London (GB), University of Washington (US), Rhodes University (ZA), Curtin University (AU), University of Cambridge (GB), Indian Institute of Technology Madras (IN), Stellenbosch University (ZA), National Radio Astronomy Observatory (US), Brown University (US), American Society for Radiation Oncology (US), University of Manchester (GB), ASTRO-3D (AU), Istituto di Radioastronomia di Bologna (IT), South African Radio Astronomy Observatory (ZA), Center for Astrophysics Harvard & Smithsonian (US), Astronomy and Space (AU), ARC Centre of Excellence for All-sky Astrophysics (AU), International Centre for Radio Astronomy Research (AU), McGill University (CA), Arizona State University (US), Winona State University (US), Massachusetts Institute of Technology (US), University of Pennsylvania (US), University of the Western Cape (ZA), University of California, Berkeley (US)
Science and Technology Facilities Council, H2020 European Research Council
Affordable and clean energy
Openalex Percentile: Top 11%
Pulsed Power Technology Applications
2.30
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