Data analysis for precision 21 cm cosmology

A Liu, JR Shaw - Publications of the Astronomical Society of the …, 2020 - iopscience.iop.org
The redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-
dimensional surveys of our universe that reach unprecedentedly large volumes, previously …

Improved constraints on the 21 cm EoR power spectrum and the X-ray heating of the IGM with HERA phase I observations

T Adams, JE Aguirre, P Alexander, ZS Ali… - The Astrophysical …, 2023 - iopscience.iop.org
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power
spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization …

First results from hera phase i: Upper limits on the epoch of reionization 21 cm power spectrum

Z Abdurashidova, JE Aguirre, P Alexander… - The Astrophysical …, 2022 - iopscience.iop.org
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 …

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

CM Trott, CH Jordan, S Midgley, N Barry… - Monthly Notices of …, 2020 - academic.oup.com
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 …

The phase II Murchison widefield array: design overview

RB Wayth, SJ Tingay, CM Trott, D Emrich… - Publications of the …, 2018 - cambridge.org
We describe the motivation and design details of the 'Phase II'upgrade of the Murchison
Widefield Array radio telescope. The expansion doubles to 256 the number of antenna tiles …

Radio observations of coronal mass ejections: space weather aspects

A Vourlidas, EP Carley, N Vilmer - Frontiers in Astronomy and Space …, 2020 - frontiersin.org
We review the current state-of-affairs in radio observations of Coronal Mass Ejections
(CMEs) from a Space Weather perspective. In particular, we examine the role of radio …

Fundamental Limitations on the Calibration of Redundant 21 cm Cosmology Instruments and Implications for HERA and the SKA

R Byrne, MF Morales, B Hazelton, W Li… - The Astrophysical …, 2019 - iopscience.iop.org
Precise instrument calibration is critical to the success of 21 cm cosmology experiments.
Unmitigated errors in calibration contaminate the Epoch of Reionization (EoR) signal …

Machine learning astrophysics from 21 cm lightcones: impact of network architectures and signal contamination

D Prelogović, A Mesinger, S Murray… - Monthly Notices of …, 2022 - academic.oup.com
Imaging the cosmic 21 cm signal will map out the first billion years of our Universe. The
resulting 3D lightcone (LC) will encode the properties of the unseen first galaxies and …

Mitigating the effects of antenna-to-antenna variation on redundant-baseline calibration for 21 cm cosmology

N Orosz, JS Dillon, A Ewall-Wice… - Monthly Notices of …, 2019 - academic.oup.com
The separation of cosmological signal from astrophysical foregrounds is a fundamental
challenge for any effort to probe the evolution of neutral hydrogen during the Cosmic Dawn …

First season MWA Phase II epoch of reionization power spectrum results at redshift 7

W Li, JC Pober, N Barry, BJ Hazelton… - The Astrophysical …, 2019 - iopscience.iop.org
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 …