First Season MWA Phase II EoR Power Spectrum Results at Redshift 7

Abstract

The compact configuration of Phase II of the Murchison Widefield Array (MWA) consists of both a redundant subarray and pseudo-random baselines, offering unique opportunities to perform sky-model and redundant interferometric calibration. The highly redundant hexagonal cores give improved power spectrum sensitivity. In this paper, we present the analysis of nearly 40 hours of data targeting one of the MWA's EoR fields observed in 2016. We use both improved analysis techniques presented in Barry et al. (2019) as well as several additional techniques developed for this work, including data quality control methods and interferometric calibration approaches. We show the EoR power spectrum limits at redshift 6.5, 6.8 and 7.1 based on our deep analysis on this 40-hour data set. These limits span a range in $k$ space of $0.18$ $h$ $\mathrm{Mp}{\mathrm{c}}^{-1}$ $<k<1.6$ $h$ $\mathrm{Mp}{\mathrm{c}}^{-1}$, with a lowest measurement of ${\Delta }^2⩽2.39\times 10^3$ ${\mathrm{mK}}^2$ at $k=0.59$ $h$ $\mathrm{Mp}{\mathrm{c}}^{-1}$ and $z=6.5$.

26 pages, 15 figures, 3 tables. Updated acknowledgements. Published in ApJ

References in corpus (16)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• Post-correlation radio frequency interference classification methods
• The Epoch of Reionization Window: I. Mathematical Formalism
• Real-Time Calibration of the Murchison Widefield Array
• First Season MWA EoR Power Spectrum Results at Redshift 7
• The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation
• Improving the Epoch of Reionization Power Spectrum Results from Murchison Widefield Array Season 1 Observations
• Fast Holographic Deconvolution: a new technique for precision radio interferometry
• MITEoR: A Scalable Interferometer for Precision 21 cm Cosmology
• Understanding Instrumental Stokes Leakage in Murchison Widefield Array Polarimetry
• Fast gain calibration in radio astronomy using alternating direction implicit methods: Analysis and applications
• The FHD/$\mathbf{\epsilon }$ppsilon Epoch of Reionization Power Spectrum Pipeline
• A Digital-Receiver for the Murchison Widefield Array
• Delay Spectrum with Phase-Tracking Arrays: Extracting the HI power spectrum from the Epoch of Reionization
• Upper Limits on the 21 cm Power Spectrum at z = 5.9 from Quasar Absorption Line Spectroscopy

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