The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
复制标题
串联冗余/天基校准对 MWA 第二阶段数据分析的影响
DOI:
10.1017/pasa.2020.37
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发表时间:
2020
影响因子:
6.3
通讯作者:
Barry, Nichole
中科院分区:
文献类型:
--
作者:
Zhang, Zheng;Pober, Jonathan C.;Li, Wenyang;Hazelton, Bryna J.;Morales, Miguel F.;Trott, Cathryn M.;Jordan, Christopher H.;Joseph, Ronniy C.;Beardsley, Adam;Barry, Nichole
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 calibration alone. In this work, we apply similar techniques to the EoR1 field and find a distinct result: the improvements in the PS from tandem calibration are significant. To understand this result, we analyse both the calibration solutions themselves and the effects on the PS over three nights of EoR1 observations. We conclude that the presence of the bright radio galaxy Fornax A in EoR1 degrades the performance of sky-based calibration, which in turn enables redundant calibration to have a larger impact. These results suggest that redundant calibration can indeed mitigate some level of model incompleteness error.
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DOI:
10.1109/ursigass.2014.6930038
发表时间:
2014
期刊:
2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)
影响因子:
--
作者:
S. Salvini;S. Wijnholds
通讯作者:
S. Wijnholds
DOI:
10.1353/cat.2016.0220
发表时间:
2016
期刊:
The Catholic Historical Review
影响因子:
--
作者:
L. A. Smoller
通讯作者:
L. A. Smoller
影响因子:
4.8
作者:
R. Joseph;C. Trott;R. Wayth;A. Nasirudin
通讯作者:
A. Nasirudin
影响因子:
4.8
作者:
Naomi Orosz;J. Dillon;A. Ewall-Wice;A. Parsons;N. Thyagarajan
通讯作者:
Naomi Orosz;J. Dillon;A. Ewall-Wice;A. Parsons;N. Thyagarajan
DOI:
10.1111/j.1365-2966.2010.17174.x
发表时间:
2010-01
影响因子:
4.8
作者:
Adrian Liu;Max Tegmark;S. Morrison;A. Lutomirski;M. Zaldarriaga
通讯作者:
Adrian Liu;Max Tegmark;S. Morrison;A. Lutomirski;M. Zaldarriaga