Bradley Greig

Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations

The HERA Collaboration Zara Abdurashidova, Tyrone Adams, James E Aguirre, Paul Alexander, Zaki S Ali, Rushelle Baartman, Yanga Balfour, Rennan Barkana, Adam P Beardsley, Gianni Bernardi, Tashalee S Billings, Judd D Bowman, Richard F Bradley, Daniela Breitman, Philip Bull, Jacob Burba, Steve Carey, Chris L Carilli, Carina Cheng, Samir Choudhuri, et al.

Journal article  |  2023  |  The Astrophysical Journal

Abstract We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using ..

Characterization of inpaint residuals in interferometric measurements of the epoch of reionization

Michael Pagano, Jing Liu, Adrian Liu, Nicholas S Kern, Aaron Ewall-Wice, Philip Bull, Robert Pascua, Siamak Ravanbakhsh, Zara Abdurashidova, Tyrone Adams, James E Aguirre, Paul Alexander, Zaki S Ali, Rushelle Baartman, Yanga Balfour, Adam P Beardsley, Gianni Bernardi, Tashalee S Billings, Judd D Bowman, Richard F Bradley, et al.

Journal article  |  2023  |  Monthly Notices of the Royal Astronomical Society

ABSTRACT To mitigate the effects of Radio Frequency Interference (RFI) on the data analysis pipelines of 21 cm inte..

Thermal and reionization history within a large-volume semi-analytic galaxy formation simulation

Sreedhar Balu, Bradley Greig, Yisheng Qiu, Chris Power, Yuxiang Qin, Simon Mutch, J Stuart B Wyithe

Journal article  |  2023  |  Monthly Notices of the Royal Astronomical Society

ABSTRACT We predict the 21-cm global signal and power spectra during the Epoch of Reionization using the meraxes se..

Bayesian jackknife tests with a small number of subsets: application to HERA 21 cm power spectrum upper limits

Michael J Wilensky, Fraser Kennedy, Philip Bull, Joshua S Dillon, Zara Abdurashidova, Tyrone Adams, James E Aguirre, Paul Alexander, Zaki S Ali, Rushelle Baartman, Yanga Balfour, Adam P Beardsley, Gianni Bernardi, Tashalee S Billings, Judd D Bowman, Richard F Bradley, Jacob Burba, Steven Carey, Chris L Carilli, Carina Cheng, et al.

Journal article  |  2023  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

ABSTRACT We present a Bayesian jackknife test for assessing the probability that a data set contains biased subsets..

Impact of instrument and data characteristics in the interferometric reconstruction of the 21cm power spectrum

Adelie Gorce, Samskruthi Ganjam, Adrian Liu, Steven G Murray, Zara Abdurashidova, Tyrone Adams, James E Aguirre, Paul Alexander, Zaki S Ali, Rushelle Baartman, Yanga Balfour, Adam P Beardsley, Gianni Bernardi, Tashalee S Billings, Judd D Bowman, Richard E Bradley, Philip Bull, Jacob Burba, Steven Carey, Chris L Carilli, et al.

Journal article  |  2023  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

ABSTRACT Combining the visibilities measured by an interferometer to form a cosmological power spectrum is a compli..

Multi-frequency angular power spectrum of the 21 cm signal from the Epoch of Reionisation using the Murchison Widefield Array

CM Trott, R Mondal, G Mellema, SG Murray, B Greig, JLB Line, N Barry, MF Morales

Journal article  |  2022  |  Astronomy and Astrophysics

Context. The Multi-frequency Angular Power Spectrum (MAPS) is an alternative to spherically averaged power spectra, and computes l..

Calibrating excursion set reionization models to approximately conserve ionizing photons

Jaehong Park, Bradley Greig, Andrei Mesinger

Journal article  |  2022  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

ABSTRACT The excursion set reionization framework is widely used due to its speed and accuracy in reproducing the 3..

Direct Optimal Mapping for 21 cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array

Zhilei Xu, Jacqueline N Hewitt, Kai-Feng Chen, Honggeun Kim, Joshua S Dillon, Nicholas S Kern, Miguel F Morales, Bryna J Hazelton, Ruby Byrne, Nicolas Fagnoni, Eloy de Lera Acedo, Zara Abdurashidova, Tyrone Adams, James E Aguirre, Paul Alexander, Zaki S Ali, Rushelle Baartman, Yanga Balfour, Adam P Beardsley, Gianni Bernardi, et al.

Journal article  |  2022  |  ASTROPHYSICAL JOURNAL

Motivated by the desire for wide-field images with well-defined statistical properties for 21 cm cosmology, we implement an optima..

Generating extremely large-volume reionization simulations

Bradley Greig, J Stuart B Wyithe, Steven G Murray, Simon J Mutch, Cathryn M Trott

Journal article  |  2022  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

ABSTRACT Preparing for a first detection of the 21-cm signal during reionization by large-scale interferometer expe..

The multifrequency angular power spectrum in parameter studies of the cosmic 21-cm signal

R Mondal, G Mellema, SG Murray, B Greig

Journal article  |  2022  |  Monthly Notices of the Royal Astronomical Society: Letters

The light-cone effect breaks the periodicity and statistical homogeneity (ergodicity) along the line-of-sight direction of cosmolo..