2024MNRAS.534.3349C

Query : 2024MNRAS.534.3349C

2024MNRAS.534.3349C - Mon. Not. R. Astron. Soc., 534, 3349-3363 (2024/November-2)

Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations.

CHARLES N., KERN N.S., PASCUA R., BERNARDI G., BESTER L., SMIRNOV O., DE LERA ACEDO E., ABDURASHIDOVA Z., ADAMS T., AGUIRRE J.E., BAARTMAN R., BEARDSLEY A.P., BERKHOUT L.M., BILLINGS T.S., BOWMAN J.D., BULL P., BURBA J., BYRNE R., CAREY S., CHEN K., CHOUDHURI S., COX T., DEBOER D.R., DEXTER M., DILLON J.S., DYNES S., EKSTEEN N., ELY J., EWALL-WICE A., FRITZ R., FURLANETTO S.R., GALE-SIDES K., GARSDEN H., GEHLOT B.K., GHOSH A., GORCE A., GORTHI D., HALDAY Z., HAZELTON B.J., HEWITT J.N., HICKISH J., HUANG T., JACOBS D.C., JOSAITIS A., KERRIGAN J., KITTIWISIT P., KOLOPANIS M., LANMAN A., LIU A., MA Y.-Z., MacMAHON D.H.E., MALAN L., MALGAS K., MALGAS C., MARERO B., MARTINOT Z.E., McBRIDE L., MESINGER A., MOHAMED-HINDS N., MOLEWA M., MORALES M.F., MURRAY S., NIKOLIC B., NUWEGELD H., PARSONS A.R., PATRA N., PLANTE P.L., QIN Y., RATH E., RAZAVI-GHODS N., RILEY D., ROBNETT J., ROSIE K., SANTOS M.G., SIMS P., SINGH S., STORER D., SWARTS H., TAN J., WILENSKY M.J., WILLIAMS P.K.G., WYNGAARDEN P.V. and ZHENG H.

Abstract (from CDS):

The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionization (EoR). This has led to the construction of low-frequency radio interferometric arrays, such as the Hydrogen Epoch of Reionization Array (HERA), aimed at systematically mapping this emission for the first time. Precision calibration, however, is a requirement in 21 cm radio observations. Due to the spatial compactness of HERA, the array is prone to the effects of mutual coupling, which inevitably lead to non-smooth calibration errors that contaminate the data. When unsmooth gains are used in calibration, intrinsically spectrally smooth foreground emission begins to contaminate the data in a way that can prohibit a clean detection of the cosmological EoR signal. In this paper, we show that the effects of mutual coupling on calibration quality can be reduced by applying custom time-domain filters to the data prior to calibration. We find that more robust calibration solutions are derived when filtering in this way, which reduces the observed foreground power leakage. Specifically, we find a reduction of foreground power leakage by 2 orders of magnitude at $k_\parallel \approx 0.5$ h Mpc$^{-1}$.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): instrumentation: interferometers - methods: data analysis - cosmology: dark ages, reionization, first stars - cosmology: observations

Errata: erratum vol. 542, p. 24 (2025)

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
2 ESO 252-18A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 714 0
3 MCG-02-24-007 LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1077 1
4 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
5 MCG+01-43-006 SyG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 502 1
6 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
7 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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