First Season MWA Phase II Epoch of Reionization Power Spectrum Results at Redshift 7

  title={First Season MWA Phase II Epoch of Reionization Power Spectrum Results at Redshift 7},
  author={W. Li and Jonathan C. Pober and Nichole Barry and Bryna J. Hazelton and Miguel F. Morales and Cathryn M. Trott and Adam E. Lanman and Michael J. Wilensky and I. S. Sullivan and Adam P. Beardsley and Tom Booler and Judd D. Bowman and Ruby L. Byrne and Brian Crosse and David Emrich and Thomas M. O. Franzen and Kenji Hasegawa and L. Horsley and Melanie Johnston-Hollitt and Daniel C. Jacobs and Christopher H. Jordan and Ronniy C. Joseph and Takeshi Kaneuji and David L. Kaplan and David Kenney and Kenji Kubota and Jack L. B. Line and Christene Lynch and Benjamin McKinley and Daniel A. Mitchell and Steven Murray and Dave Pallot and Bart Pindor and Masoud Rahimi and Jennifer Riding and Gregory Sleap and K. Steele and K. Takahashi and Steven J. Tingay and Mia Walker and Randall B. Wayth and Rachel L. Webster and A. Williams and C. Wu and J. Stuart B. Wyithe and Shintaro Yoshiura and Qian Zheng},
  journal={The Astrophysical Journal},
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 hr of data targeting one of the MWA’s epoch of reionization (EoR) fields observed in 2016. We use both improved analysis… 

Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations

Abstract We compute the spherically averaged power spectrum from four seasons of data obtained for the Epoch of Reionization (EoR) project observed with the Murchison Widefield Array (MWA). We

A new MWA limit on the 21 cm power spectrum at redshifts ∼13–17

Observations in the lowest MWA band between 75 − 100MHz have the potential to constrain the distribution of neutral hydrogen in the intergalactic medium at redshift ∼ 13−17. Using 15 hours of MWA

First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum

We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights of data (∼36 hr of integration) from Phase I of the Hydrogen Epoch of Reionization

Extracting the 21 cm EoR signal using MWA drift scan data

The detection of redshifted hyperfine line of neutral hydrogen (HI) is the most promising probe of the Epoch of Reionization (EoR).We report an analysis of 55 hours ofMurchisonWidefield Array (MWA)

The Role of the Instrumental Response in 21 cm Epoch of Reionization Power Spectrum Gridding Analyses

Reconstruction of the sky brightness measured by radio interferometers is typically achieved through gridding techniques, or histograms in spatial Fourier space. For Epoch of Reionization (EoR) 21 cm

Imaging and Modeling Data from the Hydrogen Epoch of Reionization Array

We analyze data from the Hydrogen Epoch of Reionization Array (HERA). This is the third in a series of papers on the closure phase delay spectrum technique designed to detect the H i 21 cm emission

A 21-cm power spectrum at 48 MHz, using the Owens Valley Long Wavelength Array

The Large-aperture Experiment to detect the Dark Age (LEDA) was designed to measure the 21-cm signal from neutral hydrogen at Cosmic Dawn, z ≈15-30. Using observations made with the ≈ 200m diameter

SKA-low intensity mapping pathfinder updates: deeper 21 cm power spectrum limits from improved analysis frameworks

Abstract. The Square Kilometer Array (SKA) is a planned radio interferometer of unprecedented scale that will revolutionize low-frequency radio astronomy when completed. In particular, one of its

Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline

The validation test suite uncovered several sources of scale-independent signal loss throughout the HERA Phase I software pipeline, whose amplitude is well-characterized and accounted for in the final estimates.

Characterizing EoR foregrounds: a study of the Lockman Hole region at 325 MHz

One of the key science goals for the most sensitive telescopes, both current and upcoming, is the detection of the redshifted 21-cm signal from the Cosmic Dawn and Epoch of Reionization. The success




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

Improving the Epoch of Reionization Power Spectrum Results from Murchison Widefield Array Season 1 Observations

Measurements of 21 cm Epoch of Reionization (EoR) structure are subject to systematics originating from both the analysis and the observation conditions. Using 2013 data from the Murchison Widefield

Upper Limits on the 21 cm Epoch of Reionization Power Spectrum from One Night with LOFAR

We present the first limits on the Epoch of Reionization 21 cm H i power spectra, in the redshift range z = 7.9–10.6, using the Low-Frequency Array (LOFAR) High-Band Antenna (HBA). In total, 13.0 hr

A simulation-calibrated limit on the H i power spectrum from the GMRT Epoch of Reionization experiment

The Giant Metrewave Radio Telescope Epoch of Reionization experiment is an ongoing effort to measure the power spectrum from neutral hydrogen at high redshift. We have previously reported an upper


In this paper, we explore for the first time the relative magnitudes of three fundamental sources of uncertainty, namely, foreground contamination, thermal noise, and sample variance, in detecting


We present the 21 cm power spectrum analysis approach of the Murchison Widefield Array Epoch of Reionization project. In this paper, we compare the outputs of multiple pipelines for the purpose of

Hydrogen Epoch of Reionization Array (HERA)

The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization (z = 6–12), and to


We are developing the Precision Array for Probing the Epoch of Re-ionization (PAPER) to detect 21 cm emission from the early universe, when the first stars and galaxies were forming. We describe the

Calibration requirements for detecting the 21 cm epoch of reionization power spectrum and implications for the SKA

21 cm Epoch of Reionization observations promise to transform our understanding of galaxy formation, but these observations are impossible without unprecedented levels of instrument calibration. We

Comparing Redundant and Sky-model-based Interferometric Calibration: A First Look with Phase II of the MWA

The first results from comparing both calibration approaches with MWA Phase II observations are presented, showing substantial agreement between redundant visibility measurements after calibration and improved calibration by combining OMNICAL and FHD.