SIMBAD references

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.

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

Simbad objects: 2

Full paper

View the references in ADS

To bookmark this query, right click on this link: simbad:2020MNRAS.499.5840D and select 'bookmark this link' or equivalent in the popup menu