%0 Generic %1 trott2019gridded %A Trott, Cathryn M. %A Watkinson, Catherine A. %A Jordan, Christopher H. %A Yoshiura, Shintaro %A Majumdar, Suman %A Barry, N. %A Byrne, R. %A Hazelton, B. J. %A Hasegawa, K. %A Joseph, R. %A Kaneuji, T. %A Kubota, K. %A Li, W. %A Line, J. %A Lynch, C. %A McKinley, B. %A Mitchell, D. A. %A Morales, M. F. %A Murray, S. %A Pindor, B. %A Pober, J. C. %A Rahimi, M. %A Riding, J. %A Takahashi, K. %A Tingay, S. J. %A Wayth, R. B. %A Webster, R. L. %A Wilensky, M. %A Wyithe, J. S. B. %A Zheng, Q. %A Emrich, David %A Beardsley, A. P. %A Booler, T. %A Crosse, B. %A Franzen, T. M. O. %A Horsley, L. %A Johnston-Hollitt, M. %A Kaplan, D. L. %A Kenney, D. %A Pallot, D. %A Sleap, G. %A Steele, K. %A Walker, M. %A Williams, A. %A Wu, C. %D 2019 %K library %T Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array %U http://arxiv.org/abs/1905.07161 %X We apply two methods to estimate the 21~cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired with the Phase II compact array allows a direct bispectrum estimate to be undertaken on the multiple redundantly-spaced triangles of antenna tiles, as well as an estimate based on data gridded to the $uv$-plane. The direct and gridded bispectrum estimators are applied to 21 hours of high-band (167--197~MHz; $z$=6.2--7.5) data from the 2016 and 2017 observing seasons. Analytic predictions for the bispectrum bias and variance for point source foregrounds are derived. We compare the output of these approaches, the foreground contribution to the signal, and future prospects for measuring the bispectra with redundant and non-redundant arrays. We find that some triangle configurations yield bispectrum estimates that are consistent with the expected noise level after 10 hours, while equilateral configurations are strongly foreground-dominated. Careful choice of triangle configurations may be made to reduce foreground bias that hinders power spectrum estimators, and the 21~cm bispectrum may be accessible in less time than the 21~cm power spectrum for some wave modes, with detections in hundreds of hours.

@misc{trott2019gridded, abstract = {We apply two methods to estimate the 21~cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired with the Phase II compact array allows a direct bispectrum estimate to be undertaken on the multiple redundantly-spaced triangles of antenna tiles, as well as an estimate based on data gridded to the $uv$-plane. The direct and gridded bispectrum estimators are applied to 21 hours of high-band (167--197~MHz; $z$=6.2--7.5) data from the 2016 and 2017 observing seasons. Analytic predictions for the bispectrum bias and variance for point source foregrounds are derived. We compare the output of these approaches, the foreground contribution to the signal, and future prospects for measuring the bispectra with redundant and non-redundant arrays. We find that some triangle configurations yield bispectrum estimates that are consistent with the expected noise level after 10 hours, while equilateral configurations are strongly foreground-dominated. Careful choice of triangle configurations may be made to reduce foreground bias that hinders power spectrum estimators, and the 21~cm bispectrum may be accessible in less time than the 21~cm power spectrum for some wave modes, with detections in hundreds of hours.}, added-at = {2019-05-20T05:29:13.000+0200}, author = {Trott, Cathryn M. and Watkinson, Catherine A. and Jordan, Christopher H. and Yoshiura, Shintaro and Majumdar, Suman and Barry, N. and Byrne, R. and Hazelton, B. J. and Hasegawa, K. and Joseph, R. and Kaneuji, T. and Kubota, K. and Li, W. and Line, J. and Lynch, C. and McKinley, B. and Mitchell, D. A. and Morales, M. F. and Murray, S. and Pindor, B. and Pober, J. C. and Rahimi, M. and Riding, J. and Takahashi, K. and Tingay, S. J. and Wayth, R. B. and Webster, R. L. and Wilensky, M. and Wyithe, J. S. B. and Zheng, Q. and Emrich, David and Beardsley, A. P. and Booler, T. and Crosse, B. and Franzen, T. M. O. and Horsley, L. and Johnston-Hollitt, M. and Kaplan, D. L. and Kenney, D. and Pallot, D. and Sleap, G. and Steele, K. and Walker, M. and Williams, A. and Wu, C.}, biburl = {https://www.bibsonomy.org/bibtex/2b3ab7151b93bb5d9e9119499a9d56179/gpkulkarni}, description = {Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array}, interhash = {b89e6733bfa661460286c614b44cb7bc}, intrahash = {b3ab7151b93bb5d9e9119499a9d56179}, keywords = {library}, note = {cite arxiv:1905.07161Comment: 19 pages, 10 figures, accepted for publication in PASA}, timestamp = {2019-05-20T05:29:13.000+0200}, title = {Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array}, url = {http://arxiv.org/abs/1905.07161}, year = 2019 }