2020MNRAS.499.5840D

Query : 2020MNRAS.499.5840D

2020MNRAS.499.5840D - Mon. Not. R. Astron. Soc., 499, 5840-5861 (2020/December-3)

Redundant-baseline calibration of the hydrogen epoch of reionization array.

DILLON J.S., LEE M., ALI Z.S., PARSONS A.R., OROSZ N., NUNHOKEE C.D., LA PLANTE P., BEARDSLEY A.P., KERN N.S., ABDURASHIDOVA Z., AGUIRRE J.E., ALEXANDER P., BALFOUR Y., BERNARDI G., BILLINGS T.S., BOWMAN J.D., BRADLEY R.F., BULL P., BURBA J., CAREY S., CARILLI C.L., CHENG C., DEBOER D.R., DEXTER M., DE LERA ACEDO E., ELY J., EWALL-WICE A., FAGNONI N., FRITZ R., FURLANETTO S.R., GALE-SIDES K., GLENDENNING B., GORTHI D., GREIG B., GROBBELAAR J., HALDAY Z., HAZELTON B.J., HEWITT J.N., HICKISH J., JACOBS D.C., JULIUS A., KERRIGAN J., KITTIWISIT P., KOHN S.A., KOLOPANIS M., LANMAN A., LEKALAKE T., LEWIS D., LIU A., MA Y.-Z., MacMAHON D., MALAN L., MALGAS C., MAREE M., MARTINOT Z.E., MATSETELA E., MESINGER A., MOLEWA M., MORALES M.F., MOSIANE T., MURRAY S., NEBEN A.R., NIKOLIC B., PASCUA R., PATRA N., PIETERSE S., POBER J.C., RAZAVI-GHODS N., RINGUETTE J., ROBNETT J., ROSIE K., SANTOS M.G., SIMS P., SMITH C., SYCE A., TEGMARK M., THYAGARAJAN N., WILLIAMS P.K.G. and ZHENG H.

Abstract (from CDS):

In 21-cm cosmology, precision calibration is key to the separation of the neutral hydrogen signal from very bright but spectrally smooth astrophysical foregrounds. The Hydrogen Epoch of Reionization Array (HERA), an interferometer specialized for 21-cm cosmology and now under construction in South Africa, was designed to be largely calibrated using the self-consistency of repeated measurements of the same interferometric modes. This technique, known as redundant-baseline calibration resolves most of the internal degrees of freedom in the calibration problem. It assumes, however, on antenna elements with identical primary beams placed precisely on a redundant grid. In this work, we review the detailed implementation of the algorithms enabling redundant-baseline calibration and report results with HERA data. We quantify the effects of real-world non-redundancy and how they compare to the idealized scenario in which redundant measurements differ only in their noise realizations. Finally, we study how non-redundancy can produce spurious temporal structure in our calibration solutions - both in data and in simulations - and present strategies for mitigating that structure.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): instrumentation: interferometers - dark ages, reionization, first stars

Simbad objects: 2

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Number of rows : 2
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

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