## First Season MWA EoR Power Spectrum Results at Redshift 7

### Description

The Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement. We introduce several novel analysis techniques, such as cable reflection calibration, hyper-resolution gridding kernels, diffuse foreground model subtraction, and quality control methods. Each change to the analysis pipeline is tested against a two-dimensional...[Show more]

dc.contributor.author Beardsley, A. P. Hazelton, B Sullivan, I S Carroll, P Barry, N Rahimi, M. Pindor, B. Trott, C. M. Line, J Jacobs, Daniel C. Morales, Miguel F Pober, J. C. Bernardi, G Bowman, J D Busch, M. P. Briggs, Franklin Waterson, Mark 2018-11-29T22:52:26Z 2018-11-29T22:52:26Z 0004-637X http://hdl.handle.net/1885/152169 The Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement. We introduce several novel analysis techniques, such as cable reflection calibration, hyper-resolution gridding kernels, diffuse foreground model subtraction, and quality control methods. Each change to the analysis pipeline is tested against a two-dimensional power spectrum figure of merit to demonstrate improvement. We incorporate the new techniques into a deep integration of 32 hours of MWA data. This data set is used to place a systematic-limited upper limit on the cosmological power spectrum of ${{\rm{\Delta }}}^{2}\leqslant 2.7\times {10}^{4}$ mK2 at k = 0.27 h Mpc−1 and z = 7.1, consistent with other published limits, and a modest improvement (factor of 1.4) over previous MWA results. From this deep analysis, we have identified a list of improvements to be made to our EoR data analysis strategies. These improvements will be implemented in the future and detailed in upcoming publications application/pdf IOP Publishing The Astrophysical Journal First Season MWA EoR Power Spectrum Results at Redshift 7 Journal article Imported from ARIES 833 2016 020103 - Cosmology and Extragalactic Astronomy a383154xPUB5433 Published Version Beardsley, A. P., Arizona State University Hazelton, B, University of Washington Sullivan, I S, University of Washington Carroll, P, University of Washington Barry, N, University of Washington Rahimi, M., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) Pindor, B., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Trott, C. M., Curtin University Line, J, The University of Melbourne Jacobs, Daniel C., Arizona State University Morales, Miguel F, University of Washington Pober, J. C., Brown University Bernardi, G, Harvard-Smithsonian Center for Astrophysics Bowman, J D, Arizona State University Busch, M. P., Arizona State University Briggs, Franklin, College of Science, ANU Waterson, Mark, College of Science, ANU 1 10.3847/1538-4357/833/1/102 2018-11-29T07:46:00Z 2-s2.0-85006381038 000390792000014 Open Access ANU Research Publications