TY - JOUR
T1 - A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline
AU - Garsden, Hugh
AU - Bull, Philip
AU - Wilensky, Michael J.
AU - Abdurashidova, Zuhra
AU - Adams, Tyrone
AU - Aguirre, James E.
AU - Alexander, Paul
AU - Ali, Zaki S.
AU - Baartman, Rushelle
AU - Balfour, Yanga
AU - Beardsley, Adam P.
AU - Berkhout, Lindsay M.
AU - Bernardi, Gianni
AU - Billings, Tashalee S.
AU - Bowman, Judd D.
AU - Bradley, Richard F.
AU - Burba, Jacob
AU - Carey, Steven
AU - Carilli, Chris L.
AU - Chen, Kai Feng
AU - Cheng, Carina
AU - Choudhuri, Samir
AU - DeBoer, David R.
AU - de Lera Acedo, Eloy
AU - Dexter, Matt
AU - Dillon, Joshua S.
AU - Dynes, Scott
AU - Eksteen, Nico
AU - Ely, John
AU - Ewall-Wice, Aaron
AU - Fagnoni, Nicolas
AU - Fritz, Randall
AU - Furlanetto, Steven R.
AU - Gale-Sides, Kingsley
AU - Gehlot, Bharat Kumar
AU - Ghosh, Abhik
AU - Glendenning, Brian
AU - Gorce, Adelie
AU - Gorthi, Deepthi
AU - Greig, Bradley
AU - Grobbelaar, Jasper
AU - Halday, Ziyaad
AU - Hazelton, Bryna J.
AU - Hewitt, Jacqueline N.
AU - Hickish, Jack
AU - Huang, Tian
AU - Jacobs, Daniel C.
AU - Josaitis, Alec
AU - Julius, Austin
AU - Qin, Yuxiang
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/12/1
Y1 - 2024/12/1
N2 - 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.
AB - 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.
KW - cosmology: dark ages, reionization, first stars
KW - methods: data analysis
KW - methods: statistical
KW - techniques: interferometric
UR - http://www.scopus.com/inward/record.url?scp=85211008364&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae2541
DO - 10.1093/mnras/stae2541
M3 - Article
AN - SCOPUS:85211008364
SN - 0035-8711
VL - 535
SP - 3218
EP - 3238
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -