Journal article

The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis

Zheng Zhang, Jonathan C Pober, Wenyang Li, Bryna J Hazelton, Miguel F Morales, Cathryn M Trott, Christopher H Jordan, Ronniy C Joseph, Adam Beardsley, Nichole Barry, Ruby Byrne, Steven J Tingay, Aman Chokshi, Kenji Hasegawa, Daniel C Jacobs, Adam Lanman, Jack LB Line, Christene Lynch, Benjamin McKinley, Daniel A Mitchell Show all

Publications of the Astronomical Society of Australia | Cambridge University Press (CUP) | Published : 2020

Abstract

Precise instrumental calibration is of crucial importance to 21-cm cosmology experiments. The Murchison Widefield Array’s (MWA) Phase II compact configuration offers us opportunities for both redundant calibration and sky-based calibration algorithms; using the two in tandem is a potential approach to mitigate calibration errors caused by inaccurate sky models. The MWA Epoch of Reionization (EoR) experiment targets three patches of the sky (dubbed EoR0, EoR1, and EoR2) with deep observations. Previous work in Li et al. (2018) and (2019) studied the effect of tandem calibration on the EoR0 field and found that it yielded no significant improvement in the power spectrum (PS) over sky-based cal..

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Grants

Awarded by NSF


Awarded by Ministry of Education, Culture, Sports, and Science and Technology (MEXT) of Japan


Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)


Awarded by ARC


Awarded by Australian Research Council LIEF


Funding Acknowledgements

ZZ, JCP, and WL would like to acknowledge the support from NSF grant #1613040. BJH and MFM would like to acknowledge the support from NSF grants #1506024, #1613855, and #1643011. WL would like to acknowledge the Galkin Foundation Fellowship. KT is partially supported by Grand-in-Aid from the Ministry of Education, Culture, Sports, and Science and Technology (MEXT) of Japan, No. 15H05896, 16H05999 and 17H01110, and Bilateral Joint Research Projects of JSPS. This scientific work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre which is supported by the Western Australian and Australian Governments. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. CMT is supported by an ARC Future Fellowship under grant FT180100321. The International Centre for Radio Astronomy Research (ICRAR) is a Joint Venture of Curtin University and The University of Western Australia, funded by the Western Australian State government. The MWA Phase II upgrade project was supported by Australian Research Council LIEF grant LE160100031 and the Dunlap Institute for Astronomy and Astrophysics at the University of Toronto. This research was conducted using computation resources and services at the Center for Computation and Visualization, Brown University.