FIRST SEASON MWA EOR POWER SPECTRUM RESULTS AT REDSHIFT 7
Author(s)Cappallo, Roger J; Corey, Brian E; de Oliveira Costa, Angelica; Dillon, Joshua Shane; Ewall-Wice, Aaron Michael; Feng, Lu; Goeke, Robert F; Hewitt, Jacqueline N; Morgan, Edward H; Tegmark, Max Erik; Whitney, Alan R; Kratzenberg, Eric W; Lonsdale, Colin John; McWhirter, Stephen R.; Rogers, Alan E E; Neben, Abraham Richard; Williams, Christopher Leigh; ... Show more Show less
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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 ∆² ≥ 2.7 x 10⁴ 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.
DepartmentHaystack Observatory; Kavli Institute for Astrophysics and Space Research; Massachusetts Institute of Technology. Department of Physics
The Astrophysical Journal
Beardsley, A. P., B. J. Hazelton, I. S. Sullivan, P. Carroll, N. Barry, M. Rahimi, B. Pindor, et al. “FIRST SEASON MWA EOR POWER SPECTRUM RESULTS AT REDSHIFT 7.” The Astrophysical Journal 833, no. 1 (December 9, 2016): 102. © 2016 The American Astronomical Society
Final published version