The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
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 appr...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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CAMBRIDGE UNIV PRESS
2020
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| Online Access: | https://arxiv.org/abs/2009.09269 http://hdl.handle.net/20.500.11937/91571 |
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| author | Zhang, Z. Pober, J.C. Li, W. Hazelton, B.J. Morales, M.F. Trott, Cathryn Jordan, Chris Joseph, R.C. Beardsley, A. Barry, N. Byrne, R. Tingay, Steven Chokshi, A. Hasegawa, K. Jacobs, D.C. Lanman, A. Line, Jack Lynch, Christene McKinley, Ben Mitchell, D.A. Murray, Steven Pindor, B. Rahimi, M. Takahashi, K. Wayth, Randall Webster, R.L. Wilensky, M. Yoshiura, S. Zheng, Q. |
| author_facet | Zhang, Z. Pober, J.C. Li, W. Hazelton, B.J. Morales, M.F. Trott, Cathryn Jordan, Chris Joseph, R.C. Beardsley, A. Barry, N. Byrne, R. Tingay, Steven Chokshi, A. Hasegawa, K. Jacobs, D.C. Lanman, A. Line, Jack Lynch, Christene McKinley, Ben Mitchell, D.A. Murray, Steven Pindor, B. Rahimi, M. Takahashi, K. Wayth, Randall Webster, R.L. Wilensky, M. Yoshiura, S. Zheng, Q. |
| author_sort | Zhang, Z. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T11:37:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-91571 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:37:03Z |
| publishDate | 2020 |
| publisher | CAMBRIDGE UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-915712023-05-16T05:09:35Z The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis Zhang, Z. Pober, J.C. Li, W. Hazelton, B.J. Morales, M.F. Trott, Cathryn Jordan, Chris Joseph, R.C. Beardsley, A. Barry, N. Byrne, R. Tingay, Steven Chokshi, A. Hasegawa, K. Jacobs, D.C. Lanman, A. Line, Jack Lynch, Christene McKinley, Ben Mitchell, D.A. Murray, Steven Pindor, B. Rahimi, M. Takahashi, K. Wayth, Randall Webster, R.L. Wilensky, M. Yoshiura, S. Zheng, Q. Science & Technology Physical Sciences Astronomy & Astrophysics instrumentation interferometers methods data analysis cosmology observations dark ages reionisation first stars LINE CALIBRATION EPOCH ARRAY astro-ph.IM astro-ph.IM 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. 2020 Journal Article http://hdl.handle.net/20.500.11937/91571 10.1017/pasa.2020.37 English https://arxiv.org/abs/2009.09269 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/FT180100321 http://purl.org/au-research/grants/arc/LE160100031 CAMBRIDGE UNIV PRESS restricted |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics instrumentation interferometers methods data analysis cosmology observations dark ages reionisation first stars LINE CALIBRATION EPOCH ARRAY astro-ph.IM astro-ph.IM Zhang, Z. Pober, J.C. Li, W. Hazelton, B.J. Morales, M.F. Trott, Cathryn Jordan, Chris Joseph, R.C. Beardsley, A. Barry, N. Byrne, R. Tingay, Steven Chokshi, A. Hasegawa, K. Jacobs, D.C. Lanman, A. Line, Jack Lynch, Christene McKinley, Ben Mitchell, D.A. Murray, Steven Pindor, B. Rahimi, M. Takahashi, K. Wayth, Randall Webster, R.L. Wilensky, M. Yoshiura, S. Zheng, Q. The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title | The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title_full | The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title_fullStr | The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title_full_unstemmed | The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title_short | The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis |
| title_sort | impact of tandem redundant/sky-based calibration in mwa phase ii data analysis |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics instrumentation interferometers methods data analysis cosmology observations dark ages reionisation first stars LINE CALIBRATION EPOCH ARRAY astro-ph.IM astro-ph.IM |
| url | https://arxiv.org/abs/2009.09269 https://arxiv.org/abs/2009.09269 https://arxiv.org/abs/2009.09269 https://arxiv.org/abs/2009.09269 http://hdl.handle.net/20.500.11937/91571 |